Entries |
Document | Title | Date |
20080198370 | Method and Device For Measuring the Concentricity of an Optical Fiber Core - Device for measuring the concentricity of the core | 08-21-2008 |
20080204726 | APPARATUS FOR CHARACTERIZING FIBER BRAGG GRATINGS - An apparatus characterizes at least one fiber Bragg grating. The apparatus includes a laser pulse source, an optical spectrum analyzer, and multiple optical paths. A first optical path includes a pulse stretcher and an attenuator. A second optical path optically coupled to the first optical path includes a mirror. A third optical path optically coupled to the first optical path includes a first fiber Bragg grating. A fourth optical path is optically coupled to the second optical path, the third optical path, and the optical spectrum analyzer. A fifth optical path optically coupled to the laser pulse source and the optical spectrum analyzer includes a delay line. | 08-28-2008 |
20080212082 | FIBER OPTIC POSITION AND/OR SHAPE SENSING BASED ON RAYLEIGH SCATTER - A fiber optic position and/or shape sensing device includes an optical fiber with either two or more single core optical fibers or a multi-core optical fiber having two or more fiber cores. In either case, the fiber cores are spaced apart so that mode coupling between the fiber cores is reduced, and preferably, minimized. The optical fiber is physically associated with an object. Strain on at least a portion of the optical fiber where it is associated with the object is determined by an OFDR using one or more Rayleigh scatter patterns for that portion of the optical fiber. The determined strain is used to determine a position and/or a shape of the object. | 09-04-2008 |
20080225276 | SYSTEM FOR MEASURING THE WAVELENGTH DISPERSION AND NONLINEAR COEFFICIENT OF AN OPTICAL FIBER - A method of simultaneously specifying the wavelength dispersion and nonlinear coefficient of an optical fiber. Pulsed probe light and pulsed pump light are first caused to enter an optical fiber to be measured. Then, the power oscillation of the back-scattered light of the probe light or idler light generated within the optical fiber is measured. Next, the instantaneous frequency of the measured power oscillation is obtained, and the dependency of the instantaneous frequency relative to the power oscillation of the pump light in a longitudinal direction of the optical fiber is obtained. Thereafter, a rate of change in the longitudinal direction between phase-mismatching conditions and nonlinear coefficient of the optical fiber is obtained from the dependency of the instantaneous frequency. And based on the rate of change, the longitudinal wavelength-dispersion distribution and longitudinal nonlinear-coefficient distribution of the optical fiber are simultaneously specified. | 09-18-2008 |
20080225277 | METHOD AND APPARATUS FOR TESTING AND MONITORING DATA COMMUNICATIONS IN THE PRESENCE OF A COUPLER IN AN OPTICAL COMMUNICATIONS NETWORK - Some optical communications networks include one ingress fiber, an n-way signal coupler, and n egress fibers, where each fiber may carry signals in one or both directions. A method and apparatus for testing and monitoring data communications immediately before and after the coupler is provided. Benefits include improved ability to identify and locate system faults, and improved ability to monitor data quality and content. | 09-18-2008 |
20080231842 | HIGH DYNAMIC RANGE PHOTON-COUNTING OTDR - An optical time domain reflectometer (OTDR) operates in a gated mode, enabling a predetermined width of an optical fiber to be analyzed. The OTDR may test only a desired position on the fiber. Data obtained along different lengths of the fiber may be combined together, providing a thorough representation of the fiber characteristics. Alternatively, specific regions of the fiber may be analyzed. The OTDR measures the backscattered signal using photon-counting techniques, and improves the accuracy of such algorithms by attenuating the incoming backscattering signals automatically and independently at each position in the fiber being tested. The OTDR simultaneously achieves a high dynamic range and a high temporal/spatial resolution, an improvement over conventional OTDRs. | 09-25-2008 |
20080231843 | OPTICAL PASSIVE DEVICE PRODUCT IDENTIFICATION APPARATUS AND CONNECTIVITY DETERMINATION APPARATUS - An identification apparatus for identifying an optical passive device product. The apparatus includes an optical input output monitor section for monitoring an optical input and an optical output of the optical passive device product respectively; a loss calculation section for calculating a loss in the optical passive device product based on a monitoring result of the optical input output monitor section; and a product identification section in which product information indicating a correspondence between a loss characteristic and a product has been stored in advance, and which identifies the optical passive device product by comparing the stored product information and the loss calculated by the loss calculation section. | 09-25-2008 |
20080239295 | OPTICAL POWER MONITORING WITH ROBOTICALLY MOVED MACRO-BENDING - A method may include bending a first optical fiber of a plurality of optical fibers; measuring light leaked from the first optical fiber with a photo detector; robotically moving the photo detector to a second optical fiber of the plurality of optical fibers; bending the second optical fiber; and measuring light leaked from the second other optical fiber with the photo detector. | 10-02-2008 |
20080239296 | OPTICAL FIBER INSPECTION TOOL - An optical fiber inspection device includes a housing, wherein the housing defines an opening disposed on an end portion. A lens is disposed within the housing, wherein the lens and the opening define an axis of viewing. A fiber position assembly is mounted to the housing. The fiber position assembly includes a tube having a first axial end portion and a second axial end portion. An inner diameter of the first axial end portion is larger than an inner diameter of the second axial end portion. The inner diameters of the first and second axial end portions of the tube define an inner passage, wherein a longitudinal axis of the inner passage is about perpendicular to the axis of viewing. | 10-02-2008 |
20080246957 | Hybrid fiber optic transceiver optical subassembly - The subassembly includes a laser for emitting signals towards fibers to be monitored, a first photodetector for monitoring reflected laser signals from the fibers, a second photodetector for monitoring laser output power, and an optical fiber. The optical fiber has an angled fiber facet. The laser emits signals toward and through the angled fiber facet, whereby a portion of the laser signal illuminates the second photodetector, and another portion illuminates the fibers that are being monitored and reflects back to the first photodetector such that faults on the fibers can be detected. | 10-09-2008 |
20080278711 | Distributed Backscattering - The present invention relates to a method for detecting or inferring a physical disturbances on a communications link, in particular by using distributed backscattering. The method includes the steps of: transmitting test signals onto a link; receiving test signals returned from a remote portion of the link; performing a function on the returned test signals; and in dependence on at least one characteristic of the combination signal, inferring the presence of a disturbance. The test signal are returned by a process Rayleigh backscattering along the fibre, so existing fibre installations can be used without requiring a mirror to be specifically introduced. | 11-13-2008 |
20080285016 | Method and device for monitoring an optical amplifier, in particular, an optical fiber amplifier - The invention relates to a method for monitoring an optical amplifier, in particular, an optical fiber amplifier, which has an optical input port ( | 11-20-2008 |
20080285017 | Fiber Damage Detection and Protection Device - A medical laser system and related methods of monitoring optical fibers to determine if an optical fiber cap on the optical fiber is in imminent danger of failure. The laser system includes a photodetector for converting returned light from the optical fiber cap to an electronic signal for comparison to a trigger threshold value known to be indicative imminent fiber cap failure. The returned light can be the main laser treatment wavelength, an auxiliary wavelength such as an aiming beam or infrared wavelengths generated by a temperature of the optical fiber cap. In the event the electronic signal reaches the trigger threshold value, the laser system can be temporarily shut-off or the power output can be reduced. | 11-20-2008 |
20080291431 | APPARATUS FOR MONITORING OPTICAL OBSTRUCTIONS IN AN OPTICAL SPLIT NETWORK AND METHOD THEREOF - An apparatus and method for monitoring optical fiber obstructions in an optical split network is described. The monitoring apparatus comprises a broadband-monitoring light source module, an optical circulator, an optical spectral analyzer, a high-density multi-wavelength ODTR, a controlling computer, a wavelength division multiplexer, a specific wavelength optical filter, a monitoring-waveband reflector, and an optical channel selector. The monitoring apparatus utilizes the specific wavelength optical filter and the monitoring-waveband reflector to collectively construct an optical split network optical fiber obstruction monitoring apparatus for the passive optical network having multiple split routes by filtering, reflecting, and transmitting coming lights, so as to achieve the purposes of locating the obstructed split routes and obstruction locations at the same time. | 11-27-2008 |
20080291432 | SYSTEM AND METHOD FOR MONITORING THE COUPLING EFFICIENCY OF A FIBER-OPTIC SURGICAL SYSTEM - Embodiments of the present invention provide a system and method for allowing a user to monitor the coupling efficiency of a fiber-optic surgical system. An embodiment of the present invention can include: an energy source to produce a beam of light, a fiber in optical communication with the energy source and a set of light sensors positioned to detect scattered light from the beam of light scattered proximate to the entrance of the fiber. | 11-27-2008 |
20080297772 | Detecting a Disturbance in the Propagation of Light in an Optical Waveguide - An optical time domain reflectometry apparatus has a laser and light modulator for producing coherent light pulses, each having two sections of higher intensity separated by a gap of lower or substantially zero intensity. As the light pulses propagate along the optical fibre, light is continuously Rayleigh backscattered by inhomogeneities of the optical fibre. A photodetector generates backscatter signals representing the intensity of light Rayleigh backscattered in the optical fibre as each light pulse travels along the optical fibre. The PC uses these backscatter signals to derive a difference signal representing a change dI in intensity between signals generated from two successive pulses. The PC then calculates the Root Mean Square (RMS) of the difference signal averaged over the interval between the two sections of the light pulses. Next, the PC averages the backscatter signal generated from the first of the pulses over the same interval and normalises the RMS difference signal using the averaged signal to obtain a compensated difference signal that depends only on differences in the rate of change of phase of light of the light pulses as they travelled along the waveguide. This is repeated at different wavelengths to allow the compensated difference signal to be adjusted to represent the magnitude of the differences. | 12-04-2008 |
20080297773 | Using Sets of Otdr Receive Fibers with Different Lengths of Marker Events to Verify Optical Fiber connectivity - A test receiver for use with an Optical Time Domain Reflectometer (OTDR), including a first receive fiber having a first attribute, and a second receive fiber having a second attribute different from the first attribute. The attributes may be lengths, marker events, or both. This configuration reduces the number of times an OTDR operator must travel back and forth between cable ends when testing fibers. | 12-04-2008 |
20080304051 | Inspecting end surfaces of fiber optic connectors - A system for inspecting the end faces of fiber optic connectors includes a fixture holding a plurality of fiber optic connectors. The system also includes an inspection device configured to inspect end faces of each of the fiber optic connectors, the inspection device including a movement device to which the fixture is coupled, the movement device being configured to move the inspection device relative to the fixture to allow all of the end faces to be inspected. The system also includes a computer system connected to the inspection device, the computer system being programmed to control the inspection device, display inspection data from the inspection device, and store the inspection data. | 12-11-2008 |
20080309925 | System and Method for Monitoring an Optical Communication System - A monitoring system and method may be used to monitor an optical communication system. A monitoring system and method may be used to derive loop gain data sets from optical time domain reflectometry (OTDR) or coherent optical time domain reflectometry (COTDR) data. A monitoring system and method may also use differential monitoring techniques to obtain data representing gain tilt in the transmission system and to locate an anomalous loss or gain in the transmission system. | 12-18-2008 |
20090002689 | LOOP BACK PLUG WITH PROTECTIVE DUST CAP - A loop back device can include a dust cap with which to protect the loop back ferrule after use to facilitate reuse of the loop back device. The dust cap can be provided at a free end of the loop back device when the loop back device is secured to a tether connector. When the loop back device is removed from the tether connector, the dust cap is removed from the free end of the device and is mounted over the ferrule to protect the loop back ferrule. | 01-01-2009 |
20090027659 | Measuring system for measuring a physical parameter influencing a sensor element - A measuring system is disclosed for measuring a physical parameter influencing a sensor element adapted to be connected to a measuring and control unit. The system comprises an information-carrying unit comprising a memory and being adapted to be associated with said measuring and control unit, said information-carrying unit being coordinated with the sensor element by containing stored information regarding the properties of the measuring system and the sensor element during measurements, and said information-carrying unit being supported by a connector for connecting said sensor element with said measuring and control unit. | 01-29-2009 |
20090033919 | Estimating Loss of Mechanical Splices Interconnecting Optical Fibers, and Connector Installation Tool - A method of estimating loss of a splice between first and second optical fibers spliced together by a mechanical splice or a mechanical splice-based connector having a portion through which light leaked from the splice can emerge comprises the steps of launching light into the first fiber, collecting light leaked from the portion using a multiplicity of ports, measuring the power level of the collected light and deriving the insertion loss from the measured power level, a predetermined power level and a collection factor C representing a relationship between measured power level, predetermined power level, power level of light in the first fiber, and power level of light coupled into the second fiber previously obtained for the same or similar connecting device. The ports may be angularly spaced about the axis of the connector or splice. The predetermined power level may be obtained by measuring light emerging from the connector but without the second fiber in position. | 02-05-2009 |
20090040508 | Light Monitoring Method and Light Monitoring Apparatus - A light monitoring method and a light monitoring apparatus are provided, in which light propagating optical fibers can be monitored with a simple structure and a small number of components without causing a large connection loss or Fresnel reflection and without performing precise adjustment of optical components. The light monitoring method is characterized in that light leaking from abutting portions obtained by abutting end faces of the optical fibers is received. | 02-12-2009 |
20090040509 | OPTICAL TOPOLOGY FOR MULTIMODE AND SINGLEMODE OTDR - A network test instrument for singlemode and multimode OTDR testing employs an optical topology providing for combined singlemode and multimode use of a detector for reduced cost and instrument size. | 02-12-2009 |
20090046276 | System And Method For Determination Of The Reflection Wavelength Of Multiple Low-Reflectivity Bragg Gratings In A Sensing Optical Fiber - A system and method for determining a reflection wavelength of multiple Bragg gratings in a sensing optical fiber comprise: (1) a source laser; (2) an optical detector configured to detect a reflected signal from the sensing optical fiber; (3) a plurality of frequency generators configured to generate a signal having a frequency corresponding to an interferometer frequency of a different one of the plurality of Bragg gratings; (4) a plurality of demodulation elements, each demodulation element configured to combine the signal produced by a different one of the plurality of frequency generators with the detected signal from the sensing optical fiber; (5) a plurality of peak detectors, each peak detector configured to detect a peak of the combined signal from a different one of the demodulation elements; and (6) a laser wavenumber detection element configured to determine a wavenumber of the laser when any of the peak detectors detects a peak. | 02-19-2009 |
20090059209 | LOCK-IN DEMODULATION TECHNIQUE FOR OPTICAL INTERROGATION OF A GRATING SENSOR - A grating sensor and method for optical interrogation of that sensor uses a lock-in technique to achieve simultaneous measurements of strain (and related temperature) and ultrasonic stress wave signals, as well as other environmental conditions that affect a reflection spectrum of the grating sensor. It achieves this by using a lock-in amplifier or a software demodulator to detect slight shifts in the grating reflection spectrum with high sensitivity and accuracy. A dynamic feedback loop based on the lock-in error signal output retunes the light wavelength of the light source (e.g., a tunable laser) or of a wavelength filter in the reflection path to maintain it relative to a specified reflection point of the grating reflector. The lock-in error signal serves as a measure of temperature/strain changes and of ultrasonic vibrations. | 03-05-2009 |
20090066937 | Method of Measuring the Differential Group Delay of an Optical Fiber Connection - Apparatus for measuring the differential group delay τ | 03-12-2009 |
20090073424 | FIBER RACK ASSEMBLY AND ASSOCIATED TESTING SYSTEM - A fiber rack assembly is provided. The assembly includes at least one patch panel having adapters configured to couple a first plurality of fibers to a second plurality of fibers and a test system for measuring the optical power lever of the fibers. The test system may include a base and a sensor. The base may define a plurality of test sites. Each test site is configured to support a portion of a fiber. The sensor is movable to one or more test sites and, at each test site, is configured to measure a macro-bending loss at the portion of the fiber supported at the test site as an indication of an optical power level of the fiber. The test system may also have interface panel that includes user inputs and a display. | 03-19-2009 |
20090079967 | METHOD FOR MAPPING OF DISPERSION AND OTHER OPTICAL PROPERTIES OF OPTICAL WAVEGUIDES - A method is provided for measurement of dispersion or other optical and mechanical properties within a waveguide by inducing four-photon mixing at different locations within the waveguide by timing a pump signal to counter-collide with and abruptly amplify or attenuate one or both of a probe pulse and a signal pulse at each location. The measurement of the components of the resulting mixing signal created by each collision is used to calculate dispersion defined by the location at which the collision occurred. By combining the measurements from all of the locations, a spatial map of dispersion or other optical or mechanical properties within the waveguide can be generated. | 03-26-2009 |
20090086193 | OPTICAL TIME DOMAIN REFLECTOMETER - An improvement is added to an optical time domain reflectometer for emitting pulsed light of invisible light to a measured optical fiber, receiving return light of the pulsed light by a light detection section, measuring the measured optical fiber, and emitting visible light for visible inspection of a fault point of the measured optical fiber to the measured optical fiber. The optical time domain reflectometer includes an incidence-emission port for emitting the invisible light and the visible light to the measured optical fiber and an output judgment section for judging that a communication light exists in the measured optical fiber based on the light power of the light detection section receiving light incident through the incidence-emission port in a state in which the pulsed light of the invisible light is not emitted. | 04-02-2009 |
20090097014 | Measurement of Optical Fiber Length and Determination of Chromatic Dispersion Over the Optical Fiber - In one embodiment, first optical signal can be generated at a first end of an optical fiber segment at a first time. The first optical signal can be detected at a second end of the optical fiber segment at a second time. A second optical signal can be generated at a second end of the optical fiber segment at a third time in response to the detection of the first optical signal. The second optical signal can be detected at the first end of the optical fiber segment at a fourth time. A length of the optical fiber segment can be determined based on a difference between the second time and the first time, a difference between the third time and the second time, and a difference between the fourth time and the third time. | 04-16-2009 |
20090097015 | MEASURING A CHARACTERISTIC OF A MULTIMODE OPTICAL FIBER - To measure a characteristic of a multimode optical fiber, a light pulse source produces a light pulse for transmission into the multimode optical fiber. A spatial filter passes a portion of Brillouin backscattered light from the multimode optical fiber that is responsive to the light pulse. Optical detection equipment detects the portion of the Brillouin backscattered light passed by the spatial filter. | 04-16-2009 |
20090109424 | Polarity checking apparatus for multi-fiber connectors - A polarity checking apparatus for multi-fiber connectors includes a body, a diverging lens attached to the body and a screen attached to the body, wherein the apparatus is configured to determine test and/or determine polarity of the multi-fiber connector. The screen may be translucent or may be opaque in part and rotatable for checking whether a signal is being transmitted on an individual optical fiber position of the multi-fiber connector. The invention is also directed to a method for checking the polarity of an optical assembly. | 04-30-2009 |
20090109425 | SYSTEM AND METHOD FOR DETERMINING FIBER CHARACTERISTICS - A system is provided for characterizing optical fibers carrying signal traffic. The system includes a transmitter, a variable optical attenuator (VOA), a receiver, and a computing device. The transmitter propagates an optical test signal along a channel of a fiber pathway. The VOA adjusts the attenuation of the optical test signal from an initial, greater attenuation to a subsequent, lesser attenuation. At the same time, the computing device monitors at least one other channel of the fiber pathway and identifies effects upon the other channel(s) from the optical test signal. The computing device may communicate with the VOA and with other components of the fiber pathway to direct adjustment of the signal strength. A maximum optical test signal strength may thus be achieved that does not negatively affect signal traffic on the other channels, and the fiber pathway may subsequently be tested using the achieved maximum optical test signal strength. | 04-30-2009 |
20090115999 | Optical Cable Testing - Method for testing optical fibre connection quality of an optical drop fibre between a telecommunications system and a subscriber connection box in a multi-dwelling unit or other subscriber premises before connection to other subscriber equipment comprises placing the end of the optical fibre to be tested in a fibre-holding device, which holds the fibre end in alignment with a suitable reflective body; providing an optical signal from the system direction which is reflected by the said reflective body back towards the system; and detecting the reflected signal by a suitable instrument, preferably an optical time domain reflectometer (OTDR), to confirm acceptable signalling quality of the optical path between the system and the fibre end. | 05-07-2009 |
20090116000 | FIBER OPTIC SHAPE DETERMINATION SYSTEM - A fiber optic shape determination system having at least one optical fiber for placement within or along an elongated structure. The optical fiber defines an optical path for conveying an optical signal. The optical path manifests an interaction with the optical signal wherein the interaction occurs in a continuous fashion during the propagation of the optical signal along the optical path and produces a measurable response, the response conveying information about strain imparted to the optical fiber and a location along the optical fiber at which the strain occurs. The shape determination system also has a measurement component coupled to the optical fiber to sense the response and for determining the strain applied at different locations along the fiber and for deriving a shape of optic fiber, accordingly. | 05-07-2009 |
20090135408 | Method for reducing the uncertainty of the measured average PMD of a long fiber - A methodology, device and memory medium for measuring the polarization mode dispersion (PMD) of an optical fiber is disclosed. The root mean square (rms) differential group delay (DGD) of fiber sections is estimated, the multisection DGD value τ | 05-28-2009 |
20090135409 | Optical waveguide rotator mechanism, birefringence-inducing element and polarization control devices employing either or both and methods of using same - A fiber rotator mechanism for rotating a portion of an optical waveguide, specifically an optical fiber, about a longitudinal axis thereof comprises a motor having a tubular rotor through which the fiber extends, in use, and to which the fiber is secured, directly or indirectly. An optical fiber may be secured by means of a device which also compresses the optical fiber to induce a required birefringence, conveniently by means of a spring-loaded clamping device or a ferrule of shape memory material. | 05-28-2009 |
20090141267 | OPTICAL-FIBER-CHARACTERISTIC MEASURING APPARATUS AND OPTICAL-FIBER-CHARACTERISTIC MEASURING METHOD - A measurement range is extended while maintaining the spatial resolution high by completely separating the increment of a probe light from noises. Modulations are performed on both probe light and pump light to differentiate both lights. Using the modulations, only the change in the probe light necessary for measuring the characteristic of a measurement-target optical fiber FUT can be separated. Accordingly, unlike the conventional technology, an optical wavelength filter becomes unnecessary. Further, in a case where an amplitude Δf of the frequency modulation of a light source | 06-04-2009 |
20090147244 | Method and apparatus for measuring the birefringence autocorrelation length in optical fibers - Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle. | 06-11-2009 |
20090185170 | Sensor cable and multiplexed telemetry system for seismic cables having redundant/reversible optical connections - An optical sensor cable includes at least one light source fiber extending substantially the entire length of the cable. A plurality of optical sensors are functionally coupled at an input thereof to the at least one light source fiber. At least one signal return fiber extends substantially along the entire length of the cable and is functionally coupled to an output of each of the optical sensors. The at least one source light fiber and the at least one signal return fiber are configured to be coupled at either end thereof to a respective one of a light source and a photodetection device. | 07-23-2009 |
20090185171 | Measuring modal content of multi-moded fibers - The output modal content of optical fibers that contain more than one spatial mode may be analyzed and quantified by measuring interference between co-propagating modes in the optical fiber. By spatially resolving the interference, an image of the spatial beat pattern between two modes may be constructed, thereby providing information about the modes supported by the optical fiber. | 07-23-2009 |
20090185172 | Optical Inspection of Optical Specimens Supported by a Work Holder - An optical inspection system includes an optical inspection device and an interface. The optical inspection device houses optical imaging components that acquire microscope visual images and acquire interference fringe images of a plurality of optical specimens along an optical path. The optical path is located along an optical axis of the optical inspection device. The interface is coupled to the optical inspection device and is configured to removably engage a polishing work holder that supports the plurality of optical specimens. The interface allows an optical specimen axis of each of the plurality of optical specimens and the optical axis of the optical inspection device to be aligned. | 07-23-2009 |
20090207401 | APPARATUS FOR CHARACTERIZING FIBER BRAGG GRATINGS - An apparatus characterizes at least one fiber Bragg grating. The apparatus includes a laser pulse source, an optical spectrum analyzer, and multiple optical paths. A first optical path includes a pulse stretcher and an attenuator. A second optical path optically coupled to the first optical path includes a mirror. A third optical path optically coupled to the first optical path includes a first fiber Bragg grating. A fourth optical path is optically coupled to the second optical path, the third optical path, and the optical spectrum analyzer. A fifth optical path optically coupled to the laser pulse source and the optical spectrum analyzer includes a delay line. | 08-20-2009 |
20090207402 | Method for Detecting a Core of an Optical Fiber and Method and Apparatus for Connecting Optical Fibers - A method for connecting optical fibers comprises determining the position of the core of a fiber. In response to heating, the optical fibers emit light of which an image can be recorded. The position of the core and/or the eccentricity of the fiber is determined from the recorded image. The core position and/or eccentricity can be used to align fibers for a subsequent fusion splicing operation. The process is suitable for, for example, bend optimized optical fibers. | 08-20-2009 |
20090219516 | Fiber Optic Sensing System, Method of Using Such and Sensor Fiber - An embodiment of a sensor fiber includes: at least two fiber sections with a plurality of holes; and at least one other fiber section situated between said at least two fiber sections, wherein the at least one other fiber sections being without the plurality of holes. | 09-03-2009 |
20090244522 | Polarization Optical Time Domain Reflectometer and Method of Determining PMD - In a method of measuring cumulative polarization mode dispersion (PMD) along the length of a fiber-under-test (FUT), a polarization-sensitive optical time domain reflectometer (POTDR) is used to inject into the FUT plural series of light pulses arranged in several groups. Each group comprises at least two series of light pulses having different but closely-spaced wavelengths and the same state of polarization (SOP). At least two, and preferably a large number of such groups, are injected and corresponding OTDR traces obtained for each series of light pulses by averaging the impulse-response signals of the several series of light pulses in the group. The process is repeated for a large number of groups having different wavelengths and/or SOPs. The PMD then is obtained by normalizing the OTDR traces of all of the groups, then computing the difference between each normalized OTDR trace in one group and the corresponding normalized OTDR trace in another group, followed by the mean-square value of the differences. Finally, the PMD is computed as a predetermined function of the mean-square difference. The function may, for example, be a differential formula, an arcsine formula, and so on. | 10-01-2009 |
20090244523 | Optical fiber continuous measurement system - An optical fiber continuous measurement system continually measures at least one optical property along a length of optical fiber. The system includes a rotatable body onto which a reflector is secured. The reflector is optically coupled to an end of the optical fiber, thereby allowing light propagating from the optical fiber to the reflector to be reflected back along the length of the optical fiber toward a measuring device. The property to be measured is acquired as the fiber is wound from one rotatable body to the other. The system is particularly suited for measuring attenuation, including macrobend loss in which case a localized bending mechanism is employed, along the length of the fiber. | 10-01-2009 |
20090244524 | OPTICAL POWER MONITORING WITH ROBOTICALLY MOVED MACRO-BENDING - A method may include bending a first optical fiber of a plurality of optical fibers; measuring light leaked from the first optical fiber with a photo detector; robotically moving the photo detector to a second optical fiber of the plurality of optical fibers; bending the second optical fiber; and measuring light leaked from the second other optical fiber with the photo detector. | 10-01-2009 |
20090257048 | OPTICAL FIBER INSPECTION DEVICE AND METHOD THEREOF - The present invention provides an optical fiber inspection device. The optical fiber inspection device is used to inspect an optical fiber. The optical fiber has a first termination and a second termination. The optical fiber inspection device includes a light emitter and an engagement portion. The first termination of the optical fiber can be detachably connected to the engagement portion so as to make the optical fiber to be coupled to the light emitted by the light emitter. | 10-15-2009 |
20090262336 | NON-DESTRUCTIVE TESTING OF AN INTEGRATED OPTICAL COUPLER IN AN INTEGRATED OPTICAL CIRCUIT - A non-destructive method for characterizing a surface-illuminated integrated optical coupler associated with an optical waveguide, comprising the steps of measuring the reflection coefficient on a first region of the coupler at a distance from the optical waveguide and constructing a first curve, determining a first model of the reflection coefficient on the first region, performing a first parameter fitting between the first curve and the first model to determine first parameters, measuring the reflection coefficient on a second region of the coupler close to the guide, and constructing a second curve, determining a second model of the reflection coefficient on the second region, performing a second parameter fitting between the second curve and the second model to determine second parameters, and constructing the characteristic of the coupling efficiency of the coupler using the first and second parameters. | 10-22-2009 |
20090262337 | Measuring modal content of multi-moded fibers - The output modal content of optical fibers that contain more than one spatial mode may be analyzed and quantified by measuring interference between co-propagating modes in the optical fiber. By spatially resolving the interference, an image of the spatial beat pattern between two modes may be constructed, thereby providing information about the modes supported by the optical fiber. Measurements of the phase front exiting the optical fiber under test are advantageously performed in the far field. | 10-22-2009 |
20090268196 | MICROWAVE PHOTONIC FREQUENCY DOMAIN REFLECTOMETER - A plurality of microwave signals are converted into optical signals which are directed against an optically reflective surface, whereby the optical signals reflected off of the optically reflective surface are received and converted into microwave signals, which are passed through a Fourier Transformer for extracting information of interest. | 10-29-2009 |
20090268197 | Method and apparatus for identification of multiple fibers using an OTDR - In order to simplify and expedite identification of fibers (DF | 10-29-2009 |
20090268198 | POLARIZATION MODE DISPERSION MEASUREMENT USING AN IMPROVED FIXED ANALYZER METHOD - A device for performing polarization mode dispersion (PMD) measurements of an optical fiber is disclosed. The PMD measurement device employs a fixed analyzer method, and includes a tunable Fabry-Perot inferometer as the wavelength-selective element and an optical bandpass filter for spectrum calibration. A novel scanning algorithm, which performs multiple scans at different velocities, enables accurate PMD measurements, even of moving optical cable. The tunable Fabry-Perot interferometer is able to scan over a wide wavelength range and yet have a narrow linewidth, such that a wide range of PMD values can be measured. | 10-29-2009 |
20090273775 | SCATTERED LIGHT MEASURING DEVICE - Measurement of Brillouin scattered light is enabled without an optical receiver having a wide reception band. A scattered light measuring device includes a continuous wave light source that generates continuous wave light, an optical pulse generator that converts the continuous wave light into pulsed light, an optical frequency shifter that receives the continuous wave light, and outputs shifted light including the continuous wave light, first sideband light having an optical frequency higher than an optical frequency F | 11-05-2009 |
20090303464 | OPTICAL FIBER TWISTING APPARATUS, METHOD OF MANUFACTURING OPTICAL FIBER, AND OPTICAL FIBER - An optical fiber twisting apparatus that prevents line distortion in an optical fiber undergoing a drawing process and provides a consistent coating on a bare optical fiber. This optical fiber twisting apparatus includes a twist roller apparatus that having a twist roller that, by imparting a twist to an optical fiber, imparts a twist to a molten portion of an optical fiber preform positioned on an upstream side of the optical fiber, and a support portion that supports the twist roller. The accuracy of the outer circumference of the twist roller when the twist roller is forming a part of the twist roller apparatus is 15 μm or less. | 12-10-2009 |
20090323050 | OPTICAL PATH MONITORING DEVICE AND OPTICAL PATH MONITORING SYSTEM - An optical path monitoring device according to the present invention includes: a measurement unit which irradiates optical pulses to an optical path as a monitoring target to cause back scattered lights, the measurement unit generating measurement data based on the back scattered lights; and a processing unit which controls operation of the measurement unit, the processing unit acquiring the measurement data from the measurement unit, the processing unit performing an arithmetic processing of the measurement data to identify an abnormal point of the optical path, and after acquiring the measurement data the processing unit sending the measurement unit instructions to start the next measurement. | 12-31-2009 |
20100002226 | MEASURING BRILLOUIN BACKSCATTER FROM AN OPTICAL FIBRE USING A TRACKING SIGNAL - A method for measuring Brillouin backscattering from an optical fibre ( | 01-07-2010 |
20100014071 | FREQUENCY-SCANNED OPTICAL TIME DOMAIN REFLECTOMETRY - A frequency-scanned optical time domain reflectometry technique includes launching a plurality of interrogating pulses into an optical fiber at a plurality of optical carrier frequencies. A Rayleigh backscatter signal is detected for each interrogating pulse as a function of time between the launching of the pulse and the detection of the backscatter signal. The time resolved Rayleigh backscatter signal at each optical frequency may then be examined to determine a distribution of a physical parameter along the length of the optical fiber. | 01-21-2010 |
20100014072 | Optical device for monitoring a rotatable shaft with an oriented axis - An optical device for monitoring a rotatable shaft is disclosed. The optical device has an optical waveguide arranged on the rotatable shaft and an optical sensor. The optical device further has a transmitting unit transmit the light signal, a transfer device to transmit the light signal between the transmitting unit and the optical waveguide and an evaluation unit for determining a physical variable from a light signal coming from the optical sensor and transferred by the transfer device, the evaluation unit being associated with the transmitting unit. The transfer device has an optical ‘multimode’ waveguide associated with a coupling device, the waveguide being associated with the transmitting unit and a further optical ‘multimode’ waveguide, with an associated coupling device associated with the optical waveguide and arranged on the rotatable shaft eccentrically to its axis. | 01-21-2010 |
20100026992 | SYSTEM AND METHOD FOR BUILT-IN TESTING OF A FIBER OPTIC TRANSCEIVER - Systems and methods for testing an optical fiber involving: a laser in optical communication with an end of the fiber, the laser configured to direct a test beam of radiation into an end of the fiber; a detector in optical communication with the end of the fiber, the detector configured to detect a reflection of the test beam by a defect within the fiber; and a timer connected to the laser and to the detector, wherein the timer is capable of measuring a delay between an emission of the test beam of radiation by the laser and a detection of the emitted test beam by the detector, the delay being indicative of the position of the defect within the fiber. | 02-04-2010 |
20100033711 | METHOD OF MEASURING PHYSICAL QUANTITY OF OBJECT TO BE MEASURED, AND METHOD OF CONTROLLING THE SAME - This invention relates to optical sensing technology to measure and control a physical quantity of an object that exists on or within a microstructure object, utilizing Brillouin scattering decreases. The measurement method prepares an optical waveguide one-, two- or three-dimensionally, on or within a micro-chemical chip, IC chip, or other element, and measures a physical quantity of the object on the basis of a property variation of light attributed to Brillouin scattering occurring in the optical waveguide. | 02-11-2010 |
20100066997 | Methods and devices for testing an optical fiber - Methods are provided including the steps of transmitting a beam of light through a length of the optical fiber, reflecting a transmitted beam of light at a second end of an optical fiber such that a highly reflective event reflects the light beam, and identifying the second end of the optical fiber by monitoring at least the reflected light beam. In further examples, devices are provided for removable mounting with respect to an end of an optical connector. Each device comprises a reflective surface configured to provide a highly reflective event to reflect a beam of light back through an optical fiber supported by the optical connector. In further examples, optical assemblies are provided that include an optical connector with an optical fiber and a device with a reflective surface configured to provide a highly reflective event. | 03-18-2010 |
20100073667 | Method and Apparatus for Determining Differential Group Delay and Polarization Mode Dispersion - A method and apparatus for measuring at least one polarization-related characteristic of an optical path (FUT) uses an optical source means connected to the FUT at or adjacent a proximal end of the FUT and an analyzing-and-detection unit connected to the FUT at or adjacent its proximal or distal end. The optical source means injects into the FUT at least partially polarized light having a controlled state of polarization (I-SOP). The analyzer-and-detection unit extracts corresponding light from the FUT, analyzes and detects the extracted light corresponding to at least one transmission axis (A-SOP), and processes the corresponding electrical signal to obtain transmitted coherent optical power at each wavelength of light in each of at least two groups of wavelengths, wherein the lowermost (λ | 03-25-2010 |
20100079746 | MIXER-BASED TIME DOMAIN REFLECTOMETER AND METHOD - An apparatus to measure optical characteristics of a fiber optic transmission line or other optical medium may include a source to generate a bipolar pulse signal waveform. The apparatus may also include a mixer to mix the bipolar pulse signal waveform and an optical pulse and reflected signal waveform from the fiber optic transmission line or other optical medium to form a mixed product waveform, wherein the reflected signal is responsive to the optical pulse being transmitted into the fiber optic transmission line or optical medium. | 04-01-2010 |
20100085558 | Detection System and Optical Fiber for Use in Such System - A detection system comprising: (i) an optical fiber, the optical fiber having (a) a length L≧1 km; (b) beat length between 10 m and 100 m; and (c) beat length uniformity over any distance of at least 100 m within the length L is characterized by standard deviation σ, where |σ|≦10 m; (ii) an OTDR coupled to the fiber and including (a) a radiation source providing pulsed radiation to the fiber, (b) a detection system capable of detecting radiation that is backscattered back through the fiber; and (iii) at least one polarizer situated between the fiber and the detector, such that the backscattered radiation passes through the polarizer before reaching the detector. | 04-08-2010 |
20100097600 | Fiber Optic Optical Subassembly Configuration - A fiber optic optical subassembly configuration for monitoring fibers. The configuration includes a hollow container, a laser for emitting laser signals towards the fibers being monitored, a photodetector for monitoring reflected laser signals from the fibers being monitored and for monitoring laser output power, a beam splitter and an optical fiber. The optical fiber, disposed within the hollow container, has a coated end face surface, the laser emits signals toward and through the beam splitter, whereby a portion of the laser signal illuminates the photodetector, and another portion traverses down the optical fiber toward the coated end face surface and reflects off the coated end face surface toward the fibers that are being monitored, and reflects back from the fibers being monitored to the photodetector such that faults on the fibers can be detected. | 04-22-2010 |
20100097601 | OPTICAL FIBER TRANSMISSION LINE MEASUREMENT APPARATUS AND SYSTEM - A measurement apparatus for measuring an optical fiber transmission line used to connect to an opposite apparatus, the measurement apparatus includes a transmission part for generating a measurement packet used for measuring a length of a first and second optical fiber transmission line, and transmitting the measurement packet to the opposite apparatus through the first optical fiber transmission line, a reception part for detecting the measurement packet returned from the opposite apparatus that perform a loopback processing of the measurement packet through the second optical fiber transmission line, a calculation part for calculating a packet transmission time which is a processing time required from the generation of the measurement packet to the detection of the measurement packet, and a measurement part for performing a measurement control of the length of the first and second optical fiber transmission line based on the packet transmission time calculated by the calculation part. | 04-22-2010 |
20100110417 | CRITICALLY COUPLED MICRORING RESONATOR AND METHOD - A microring resonator and methods critically couple a microring waveguide to an adjacent bus waveguide. A method of determining parameters of a critically coupled microring resonator includes modeling a coupled portion of the microring resonator as a U-shaped waveguide spaced apart from a straight waveguide by a gap and selecting a straight waveguide width and a gap size to optimize an output coupling ratio between the U-shaped waveguide and the straight waveguide. A method of producing the microring resonator includes using the determined parameters to produce, and a critically coupled microring resonator includes, a ring-shaped or microring waveguide spaced from the bus waveguide by a gap. | 05-06-2010 |
20100118295 | System and Method for Measuring a Laser-Induced Damage Threshold in an Optical Fiber - A system for measuring a laser-induced damage threshold in an optical fiber may include a lens to direct a first laser beam through a core of the optical fiber. The system may also include an optical arrangement to direct a second laser beam through an exterior surface of the optical fiber and into the core of the optical fiber at a preselected location of the optical fiber to provide a predetermined power density at the preselected location, wherein the optical arrangement causes the second laser beam to be directed into the optical fiber substantially completely around a perimeter of the optical fiber to provide the predetermined power density. | 05-13-2010 |
20100123896 | Method and Apparatus for Measuring the Birefringence Autocorrelation Length in Optical Fibers - Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle.) | 05-20-2010 |
20100128257 | METHOD FOR MEASURING POLARIZATION CHARACTERISTICS OF OPTICAL FIBER, DRAWING METHOD, METHOD FOR IDENTIFYING ABNORMAL POINT, AND METHOD FOR CONFIGURING OPTICAL FIBER TRANSMISSION LINE - The present invention relates to a measuring method, etc., comprising a structure for accurately measuring optical characteristics such as PMD of an optical fiber. The measuring method is a technique for measuring polarization characteristic distributions along the longitudinal direction of the optical fiber as a measuring object by using BOCDA, and by propagating probe light and pumping light opposite in the optical fiber, BGS is generated at a plurality of respective measurement positions. Then, based on Brillouin gain fluctuations at the respective measurement positions, polarization characteristic distributions are calculated. | 05-27-2010 |
20100128258 | APPARATUS FOR INTERROGATING FIBRE BRAGG GRATINGS - Apparatus for interrogating an optical fibre comprising a plurality of fibre Bragg gratings each having a resonant wavelength in a different discrete wavelength band. The apparatus comprises a delay arrangement interposed in use in an optical path for light supplied to and/or reflected from the fibre Bragg gratings. The delay arrangement is configured to apply a different time delay to light in each of the discrete wavelength bands, whereby the light reflected from each of the fibre Bragg gratings is received at an interrogator port of the apparatus in a different discrete time interval. | 05-27-2010 |
20100134787 | MEASUREMENT METHOD OF CHROMATIC DISPERSION OF OPTICAL BEAM WAVEGUIDE USING INTERFERENCE FRINGE MEASUREMENT SYSTEM - The present invention relates to a measurement method of the chromatic dispersion of an optical waveguide using an optical interferometer with a broadband multi-wavelength light source and an optical spectrum analyzing apparatus, wherein one arm, called “reference arm” of the interferometer's two arms has an adjustable air spacing and the other arm, called “sample arm” can contain said optical waveguide to be measured, and including the following measurement and analysis steps: measuring interference spectra of the optical beam output exiting from the said interferometer with an optical spectrum analyzing apparatus when said optical waveguide is connected to said sample arm, and when said optical waveguide is not connected to said sample arm respectively; by adjusting the reference arm length for appearance of clear interference patterns; converting the wavelength-domain interference spectra into frequency-domain interference spectra and calculating phase difference values of the interference peaks of one of the spectra from a predetermined reference peak as a function of the frequency change by counting the interference peak (or valley) points; finding a Taylor series curve fit function for each set of the phase difference value data corresponding to each of the two interference spectra; and calculating a chromatic dispersion coefficient of the optical waveguide by using the coefficients of the Taylor series curve fit functions. | 06-03-2010 |
20100134788 | Method for Increasing Accuracy of Measurement of Mean Polarization Mode Dispersion - The present invention provides a method of determining a mean differential group delay associated with a length of optical fiber. The method including measuring a magnitude of a polarization mode dispersion vector as a function of frequency, using a frequency-domain polarization mode dispersion measurement apparatus, where the magnitude of the polarization mode dispersion vector is a scalar differential group delay. Also the method calculates a frequency derivative of the scalar differential group delay from the magnitude of the polarization mode dispersion vector to obtain a first result. The frequency derivative of the scalar differential group delay being a scalar second-order polarization mode dispersion function. The method further multiplies a proportionality coefficient B | 06-03-2010 |
20100141934 | Inspection Tip for a Fiber Optic Inspection Probe - An inspection probe is disclosed for use with a fiber optic adapter. The inspection probe can inspect a terminated end of an optical fiber within the fiber optic adapter. The fiber optic adapter can include a ferrule receiver located between first and second ports. The inspection probe is inserted into the first port of the fiber optic adapter and a coupling feature of the inspection probe engages and aligns with the ferrule receiver. A fiber optic connector is inserted into the second port of the fiber optic adapter and a ferrule of the fiber optic connector aligns with the ferrule receiver. The ferrule holds the terminated end of the optical fiber and thereby positions the terminated end within the ferrule receiver. An image capturing end of the inspection probe is thereby positioned proximal the terminated end of the optical fiber and can inspect the terminated end and/or the ferrule. | 06-10-2010 |
20100149521 | Apparatus And Method For Monitoring Extinction Ratio Of Optical Signals - An apparatus for monitoring extinction ratio (ER) of optical signals comprises an optical spectrum analyzing unit, an ER monitoring control unit and an ER monitoring output unit. The optical spectrum analyzing unit measures two peak values corresponding to level one and level zero of optical signals from an optical coupler, and obtains two wavelengths for the two peak values. The ER monitoring output unit outputs the difference of the two wavelengths to the ER monitoring control unit. With a relation formula of the wavelength difference, the ER monitoring control unit estimates an optimal resolution bandwidth for setting up the optical spectrum analyzing unit. As such, the optical spectrum analyzing unit measures two optical powers corresponding to level one and level zero of optical signals. With the two optical powers, the ER monitoring output unit computes an ER value. | 06-17-2010 |
20100149522 | METHOD FOR SIMULATING THE TRANSMISSION CHARACTERISTICS OF OPTICAL MULTIMODE WAVEGUIDES - A method for determining optical characteristics of a channel waveguide by way of beam tracking by calculating a profile of sample beams using geometrical optics, in which first the profile is determined as a curve by projection into a two-dimensional area, then a three-dimensional area is determined by the curve, in which area the three-dimensional profile is determined as a substantially two-dimensional problem. A device or installation and a software product which use the method are also provided. | 06-17-2010 |
20100165327 | MEASURING BRILLOUIN BACKSCATTER FROM AN OPTICAL FIBRE USING CHANNELISATION - A method for measuring Brillouin backscattering comprises obtaining a signal representative of backscattered Brillouin light received from a deployed optical fibre, and dividing the signal into a plurality of signal components each having a different frequency hand. Each signal component is delivered to one of a plurality of parallel detection channels, in which the components are detected, and the signal generated by the detection is sampled using an analog-to-digital converter. The samples are then processed to determine one or more properties of the Brillouin spectral line. Detection may be optical, where the backscattered light is dispersed into a plurality of optical frequency components, or electrical, where the backscattered light is first frequency mixed to downconvert the frequency to the microwave regime. | 07-01-2010 |
20100165328 | APPARATUS AND METHOD FOR MEASURING CHROMATIC DISPERSION - Highly accurate measurement of chromatic dispersions of a device under test that is an optical component is enabled with a simple structure comprising: propagating pump light having a wavelength λ | 07-01-2010 |
20100171945 | Method of Classifying a Graded-Index Multimode Optical Fiber - A method of classifying a graded-index multimode optical fiber includes taking a series of individual measurements at a single wavelength, and using the measurements to characterize the departure of the multimode optical fiber's actual index profile from the corresponding nominal index profile. The measurements, coupled with intermodal dispersion or EMB measurement, may be used to predict the approximate transmission properties of the optical fiber at wavelengths other than the measurement wavelength. | 07-08-2010 |
20100177301 | Characterization Of Non-Linear Optical Materials Using Bragg Coupling - Methods of characterizing non-linear optical materials and fabricating wavelength conversion devices are provided. The method of characterizing non-linear optical materials comprising a periodically poled waveguide layer and at least one waveguide region includes coupling at least one diagnostic laser beam into the waveguide region at one or more input locations positioned on the waveguide layer of the non-linear optical material, and out-coupling the diagnostic laser beam from the waveguide region by applying an electric field to the periodically poled domains at one or more output locations positioned on the waveguide layer. The method also includes measuring an intensity level of the out-coupled beam and determining at least one optical property of the waveguide region based at least in part on the measured intensity level of the out-coupled beam. The characterization method may be implemented into a wavelength conversion fabrication process. | 07-15-2010 |
20100177302 | Phase Based Sensing - A method of interrogating a phase based transducer by providing a pulsed input including two different wavelengths. The different wavelength components can be used to derive a phase change experienced by a synthetic wavelength, and by arranging for the synthetic wavelength to be significantly greater that the component wavelengths, the phase so detected has a reduced sensitivity, and is less susceptible to overscaling effects. | 07-15-2010 |
20100188652 | QUANTUM DOT-MEDIATED OPTICAL FIBER INFORMATION RETRIEVAL SYSTEMS AND METHODS OF USE - The present disclosure relates to a non-invasive and real-time diagnostic analysis concept for an operational single mode optical fiber communication system and methods of using said system. The system comprises an optical fiber capable of being diagnosed non-invasively comprising an optical fiber for conveying a light beam that comprises an optical fiber comprising a first end for receiving the light beam and a second end opposed thereto, a core comprising an inner wall, and a cladding surrounding the core, the optical fiber further comprising at least one uncladded portion comprising a plurality of quantum dots dispersed in a medium, and wherein the quantum dots become activated by evanescent wave coupling resulting from total internal reflection of the light beam contacting the inner wall of the optical fiber core and wherein the activation results in emittance of light from the quantum dots. | 07-29-2010 |
20100220317 | Method and Apparatus for Acoustic Sensing Using Multiple Optical Pulses - An improved technique for acoustic sensing involves, in one embodiment, launching into a medium, a plurality of groups of pulse-modulated electromagnetic-waves. The frequency of electromagnetic waves in a pulse within a group differs from the frequency of the electromagnetic waves in another pulse within the group. The energy scattered by the medium is detected and, in one embodiment, the beat signal may be used to determine a characteristic of the environment of the medium. For example, if the medium is a buried optical fiber into which light pulses have been launched in accordance with the invention, the presence of acoustic waves within the region of the buried fiber can be detected | 09-02-2010 |
20100225900 | OPTICAL-FIBER-CHARACTERISTIC MEASURING DEVICE AND OPTICAL-FIBER-CHARACTERISTIC MEASURING METHOD - A measurement precision is improved and a measurement range is extended by efficiently suppressing a noise level of integrated unnecessary components from non-correlation positions. Measuring means | 09-09-2010 |
20100225901 | PON TESTER - A high resolution optical fiber length meter, live fiber detector, and reflectance tester (instrument) for single mode applications using a low power, long wavelength laser for generating wide and narrow optical pulses that are launched into a single mode fiber under test. The laser output fiber pigtail is fusion spliced to a singlemode coupler whose output is coupled to the instrument bulkhead connector. A PIN photodiode is fusion spliced to the singlemode coupler to receive the reflected light from the fiber under test. The high resolution hand-held instrument is useful in examining singlemode passive optical networks (PON). | 09-09-2010 |
20100238427 | OPTICAL FIBER FEATURE DISTRIBUTION SENSOR - The present invention relates to an optical fiber characteristic distribution sensor comprising a structure to effectively reduce the measurement errors of position in the temperature distribution measurement etc. The sensor comprises an optical fiber section, part of which is installed in an object to be measured and to which probe light and pumping light are inputted in opposite directions. The optical fiber section includes a marker portion where data relating to the shape of a BGS in the maker has been preliminarily measured in a state where the optical fiber section is installed in a normal state. At the time of calculating the characteristic distribution in the longitudinal direction of the optical fiber section while measuring the data relating to the BGS shape, the errors of the calculated gain occurrence position are corrected, for example, by shifting the scanning range of phase difference between the probe light and the pumping light. The amount of shift of the scanning range of phase difference is given based on a difference value between the phase difference at the time of measurement when the BGS that reflects the gain that has occurred in the marker portion is measured, and the reference phase difference when data relating to the already known shape of the BGS in the marker portion has been preliminarily measured. | 09-23-2010 |
20100238428 | METHOD FOR DETECTING FIBER OPTIC FIBERS AND RIBBONS - A method of identifying or tracing one of a plurality of fiber optic fibers including transmitting a plurality of fiber identification data signals into ends of a plurality of fiber optic fibers, wherein a different data signal is transmitted to each of the plurality of fiber optic fibers; and identifying one of the plurality of fiber optic fibers based on the signal transmitted on the one fiber; wherein the data signals are digital codes. | 09-23-2010 |
20100238429 | Method and Apparatus for Acoustic Sensing Using Multiple Optical Pulses - An improved technique for acoustic sensing involves, in one embodiment, launching into a medium, a plurality of groups of pulse-modulated electromagnetic-waves. The frequency of electromagnetic waves in a pulse within a group differs from the frequency of the electromagnetic waves in another pulse within the group. The energy scattered by the medium is detected and, in one embodiment, may be used to determine a characteristic of the environment of the medium. For example, if the medium is a buried optical fiber into which light pulses have been launched in accordance with the invention, the presence of acoustic waves within the region of the buried fiber can be detected | 09-23-2010 |
20100253936 | MEASUREMENT OF NONLINEAR EFFECTS OF AN OPTICAL PATH - A network device may include a receiver to receive optical pulses from an optical path, wherein the optical pulses include a plurality of intensities and represent data. The network device may also include a processor to determine a rate of bit errors introduced during propagation of the optical pulses through the optical path and to determine a parameter indicative of nonlinear effects of the optical path based on the rate of bit errors and the plurality of intensities. | 10-07-2010 |
20100271622 | Optical time domain reflectometer and method for testing optical fiber using optical pulse - When a measurement position is specified by a marker during real time measurement, a marker level acquisition unit acquires a waveform level from waveform data stored in a waveform memory. A level comparison unit judges whether the waveform level acquired by the maker level acquisition unit is within an effective measurement level range set in accordance with a currently selected attenuator (ATT) value. If the level comparison unit judges that the waveform level is out of the effective measurement level range, an ATT value modification unit modifies the ATT value to a new ATT value so that the waveform level is contained in the corresponding effective measurement level range. According to the new ATT value, a control performs measurement of an optical fiber to be measured so that a waveform can be observed with a preferable SN ratio above a predetermined value according to the measured waveform displayed on a screen of a display unit. | 10-28-2010 |
20100271623 | Method and Apparatus for Characterizing a Multilayered Structure - An apparatus and method for characterizing the complex coupling coefficient of a multilayered periodic structure either during or after inscription is described. This apparatus is capable of continuously measuring the complex reflectivity at single or multiple wavelengths to a resolution limited by Rayleigh scattering in the waveguide section where the structure is inscribed. The apparatus is also capable of rejecting undesired signals associated with stray reflections in the system and unwanted environmentally induced change in optical path lengths during the inscription procedure. The complex coupling coefficient of the multilayered periodic structure can be derived from the measured complex reflectivity and can reveal errors present in the structure. The complex coupling coefficient can also be used to derive an error signal to enable implementation of a closed loop inscription system capable of inscribing error free multilayer structures. | 10-28-2010 |
20100277719 | Intrusion Detecting System With Polarization Dependent Sensing Elements - A detection system includes a length of optical fiber and an OTDR coupled to the optical fiber. The OTDR includes a radiation source providing pulsed radiation to the fiber, a detector detecting radiation that is backscattered through the fiber, and a processor capable of analyzing the variation of the radiation that is backscattered through the fiber. At least two polarization dependent sensing elements are positioned along the length of optical fiber. | 11-04-2010 |
20100277720 | VIRTUAL FENCE SYSTEM AND METHOD - A security, monitoring and/or detection system is described. In several exemplary embodiments, the system secures, monitors, and/or detects movement across, a boundary extending across, for example, a relatively large geographic area such as, for example, a transnational border. | 11-04-2010 |
20100283996 | METHOD AND SYSTEM FOR DISTRIBUTED MEASUREMENT AND COMPENSATION OF CHROMATIC DISPERSION IN AN OPTICAL NETWORK - A method and apparatus for distributed measurement of chromatic dispersion in an optical network is disclosed. The network comprises optical switching nodes interconnected by optical links. An optical link may comprise multiple spans, each span ending in a transport module which comprises signal-processing components. At least one optical switching node has a probing signal generator transmitting an optical probing signal along a selected path in the network. Probing-signal detectors placed at selected transport modules determine chromatic-dispersion values and send results to a processing unit which determines appropriate placement of compensators or appropriate adjustments of compensators placed along the path. A preferred probing signal has the form of wavelength modulated optical carrier which is further intensity modulated by a periodic, preferably sinusoidal, probing tone. Variation in the phase-shift of the probing tone corresponding to variation of the wavelength of the optical probing signal determines chromatic-dispersion characteristics for different spans of the path. | 11-11-2010 |
20100283997 | Test device, system and method for optic fiber cable connections - The specification discloses test device, system, and method for optic fiber cable connections. A light-emitting element emits a light signal, and a light-receiving element receives the light signal. When no electrical signal is received within a predetermined time, the central processing unit generates a random delay time for the light-emitting element to wait for the random delay time before re-emitting the light signal for a connection test. The invention solves the problem of difficulty in locating wrong corrections of optic fiber cables. It can quickly check whether the optic fiber cables are correctly connected. | 11-11-2010 |
20100290035 | CHAOTIC OPTICAL TIME DOMAIN REFLECTOMETER METHOD AND APPARATUS - In a method and a corresponding apparatus for performing chaotic optical time domain reflectometer, the chaotic laser signal, generated by the chaotic laser transmitter, is split into probe signal I and reference signal II by a fiber coupler. Through an optical circulator, the probe signal I is launched into the test fiber and the echo light is converted into electrical signal by a photodetector and digitalized by an A/D converter. The reference signal II is converted into electrical signal by a photodetector and digitalized by another A/D converter. Two digital signals received from two A/D converters are correlated in a signal processing device to locate the exact position of faults in fibers. The result output is then displayed on a display device. This invention was developed to overcome the tradeoff between resolution and dynamic range of the pulse-based OTDR. This method can improve the dynamic range and spatial resolution significantly; enhance the anti-jamming capability and noise tolerance. Also it has merits of simple structure and lower cost. | 11-18-2010 |
20100302530 | DUST CAP ASSEMBLY FOR SEALING AN OPTICAL FIBER FERRULE AND METHODS THEREOF - A dust cap assembly comprising a sleeve and a sealant that seals a fiber optic ferrule from contaminants and, upon removal, provides remedial cleaning of any foreign matter present on the ferrule when the dust cap assembly was initially installed. Further, the sealant has advantageous mechanical and optical properties such that the interaction of the sealant, the sleeve and the fiber optic ferrule defines a convex shape. The dust cap assembly may therefore function as a terminator that reduces back reflection during testing. | 12-02-2010 |
20100302531 | Method And Apparatus For Fiber Optic Signature Recognition - A method and apparatus is disclosed for use in fiber optic signature recognition to analyze buried optical fiber to identify a non-threat area along a fiber route and to discontinue monitoring for disturbances along that area of the cable route. The technique includes determining the location of the zone of non-threatening disturbances from comparing an optical signal to the representation of a prearranged optical signal identified as friendly. Once a zone of non-threatening disturbances is identified, all subsequent disturbances in that zone are considered friendly. Cable monitoring is discontinued in the identified zone of non-threatening disturbances so as to avoid monitoring fiber cable when permitted workers are in the area. | 12-02-2010 |
20100309456 | SYSTEM AND METHOD FOR MEASURING DISPERSION - A method for measuring dispersion in an optical fiber is provided and includes the following steps. A periodic wavelength variation pulse light signal is generated by a periodic frequency-swept pulse light source, in which the periodic wavelength variation pulse light signal has periodic wavelength variations. The periodic wavelength variation pulse light signal is transmitted into a test optical fiber. The periodic wavelength variation pulse light signal propagating through the test optical fiber is detected to generate a sensing signal. The sensing signal is transformed into an RF spectrum to obtain a slow periodic pulse timing variation of the periodic wavelength variation pulse light signal in accordance with the RF spectrum. A dispersion value of the test optical fiber is obtained in accordance with the slow periodic pulse timing variation. A system for measuring dispersion in a fiber is also disclosed herein. | 12-09-2010 |
20100315620 | Method and Metric for Selecting and Designing Multimode Fiber for Improved Performance - A new metric applicable to the characterization and design of multimode fiber (MMF) is described. The metric is derived from a Differential Mode Delay (DMD) measurement and when used in combination with industry-standard metrics such as Effective Modal Bandwidth (EMB) and DMD, yields a more accurate prediction of MMF channel link performance as measured by Bit Error Rate (BER) testing. The metric can also be used in the design of MMF for improved bandwidth performance. When implemented as a test algorithm in production, it can be used to select, sort, or verify fiber performance. This process can yield a multimode fiber design with a greater performance margin for a given length, and/or a greater length for a given performance margin. | 12-16-2010 |
20100315621 | PHASE MODULATOR, PHASE MODULATOR ASSEMBLY, AND PHOTOSENSOR - The present invention provides a photosensor that uses a phase modulation technique for optical detection and conducts a highly accurate measurement. The photosensor uses a phase change difference of light propagated through a polarization preserving fiber with respect to tensile stress and employs proper polarization preserving fibers for a phase modulator | 12-16-2010 |
20100328650 | Fiber Property Measurement - A fiber instrument for measuring properties of a fiber sample, the fiber instrument having a surface for receiving the fiber sample, a hand for pressing the fiber sample against the surface, an illumination source for selectively illuminating the fiber sample with more than one peak wavelength, where each of the peak wavelengths is independently controllable as to an applied intensity of the peak wavelength, a sensor for capturing images of the fiber sample while it is illuminated, and a controller for controlling at least the sensor and the illumination source. By providing multiple peak wavelengths of illumination that are each independently controllable as to illumination intensity, the fiber instrument as described herein is better able to detect both foreign material within the fiber sample, and color gradations of the fiber sample. | 12-30-2010 |
20100328651 | METHOD AND SYSTEM FOR FIBER-OPTIC MONITORING OF SPATIALLY DISTRIBUTED COMPONENTS - A system for monitoring a plurality of components distributed in different space locations, includes: at least one optical fiber path; an optical radiation source adapted to inject optical radiation into the at least one optical fiber path; at least one first and at least one second optical branches branching from the at least one optical fiber path and adapted to spill respective portions of the optical radiation, the first and second optical branches being adapted to be operatively associated with a respective component to be monitored. The first optical branch includes a first optical reflector and is adapted to reflect the spilled optical radiation portion unless the respective component at least partially breaks; the second optical branch includes at least one passive optical attenuator adapted to be operatively coupled to the respective component to be monitored, and having an attenuation capable of changing in response to a change in operating conditions of the respective monitored component when operatively coupled thereto, and a second optical reflector. An optical receiver is adapted to detect back-reflected optical radiation reflected by the first and second optical branches. The monitoring system is adapted to recognize a position of a component of the plurality of components based on a characteristic of the back-reflected optical radiation. | 12-30-2010 |
20110001959 | OPTICAL FIBRE CIRCUIT MONITORING SYSTEM AND MONITORING DEVICE INCLUDED IN THIS SYSTEM - Optical fiber lines of a PON system can be monitored with the remote fiber test system having a practical structure, comprising a branch-type optical fiber line constituting the PON system and test equipment connected to the branch-type optical fiber line on the central office side. The test equipment comprises a light source, an optical splitter, a detecting part, and a control unit. The light source outputs light having an optical coherence function of a comb shape that is formed as a result of the optical frequency being modulated by a modulation signal of period p. The optical splitter receives light output from the light source and splits the light into probe light and reference light. The detecting part detects interference light that occurs from mutual interference between the reference light and reflected light arising while the probe light propagates through the branch-type optical fiber line. And, upon detection of the interference light, the detecting part converts the interference light into an electrical signal. The control unit changes the period p, and on the basis of the period p and the electrical signal output from the detecting part, obtains reflectance distribution along the direction of the probe light propagation in the branch-type optical fiber line. | 01-06-2011 |
20110032517 | OPTICAL FIBER CHARACTERISTIC MEASURING DEVICE AND METHOD - An optical fiber characteristic measuring device of the present invention includes: a light source which emits laser light modulated at a predetermined modulation frequency; an incident section which causes the laser light from the light source as continuous light and pulsed light to be incident from one end and other end of an optical fiber respectively; a timing adjuster which causes light emitted from the optical fiber to pass therethrough at a predetermined timing; and a light detector which detects the light which passes through the timing adjuster, and measures a characteristic of the optical fiber by using a detection result of the light detector, and the device includes: a synchronous detector which synchronously detects the detection result of the light detector by using a synchronization signal having a predetermined frequency; and a frequency setter which changes the frequency of the synchronization signal in a case where the modulation frequency at the light source is an integer multiple of the frequency of the synchronous signal. | 02-10-2011 |
20110032518 | DETECTION ASSEMBLY - A detection assembly comprising: a body portion having a slot formed along at least a portion of a length thereof, the slot having a slot opening formed in an outer surface of the body portion, the slot opening being arranged to receive a sensor optical fibre through the slot opening; a sensor optical fibre constrained to lie in said slot and in juxtaposition with a plurality of protrusions; and at least one swell member, the swell member being configured to increase in volume in response to exposure to a target measurand, the detection assembly being arranged whereby an increase in a volume of said swell member causes said sensor optical fibre to be urged against at least one of said plurality of protrusions thereby to cause bending of said sensor optical fibre. | 02-10-2011 |
20110037972 | INTERFEROMETER EMPLOYING A MULTI-WAVEGUIDE OPTICAL LOOP PATH AND FIBER OPTIC ROTATION RATE SENSOR EMPLOYING SAME - An interferometer employed, in part, as a Sagnac interferometer or fiber optic gyro (FOG) includes a light source ( | 02-17-2011 |
20110043790 | LIGHT PULSE GENERATOR AND OPTICAL TIME DOMAIN REFLECTOMETER USING THE SAME - There is provided a light pulse generator. The light pulse generator includes: a laser diode; a voltage source that provides a bias voltage to the laser diode; a switching element that causes the laser diode to emit a light pulse by directly modulating the laser diode; and an auxiliary current circuit which starts to charge immediately after turn-on of the switching element and which starts to discharge after a forward current flows through the laser diode so as to provide a auxiliary current to the laser diode in the same direction as the forward current. | 02-24-2011 |
20110051126 | Method for Increasing Accuracy of Measurement of Mean Polarization Mode Dispersion - A method of determining a mean square differential group delay associated with a length of optical fiber. The method including measuring a polarization mode dispersion vector as a function of frequency, using a frequency-domain polarization mode dispersion measurement apparatus. The method also including calculating a second-order polarization mode dispersion vector as a function of frequency by calculating a derivative of the polarization mode dispersion vector with respect to frequency. Also, calculating the mean of the magnitude of the second-order polarization mode dispersion vector to obtain a first result. Further, multiplying a proportionality coefficient by the first result to calculate the mean square differential group delay. | 03-03-2011 |
20110063605 | METHOD OF TESTING A PASSIVE OPTICAL ELEMENT - A passive optical element defining an optical propagation path is tested by coupling a first end of a first buffer fiber to an input of the optical propagation path and coupling a second end of the buffer fiber to an optical time domain reflectometer (OTDR). The OTDR launches optical radiation into the first buffer fiber via the second end thereof, measures power level of return light received at the OTDR via the second end of the first buffer fiber, and creates a first OTDR signature representing power level of return light as a function of distance from the second end of the first buffer fiber. The OTDR selects a first marker point by applying data reduction to at least a portion of a segment of the first OTDR signature corresponding to the first buffer fiber, selects a second marker point downstream of the input of the optical propagation path, and calculates a first power difference value as difference between a power level at the first marker point and a power level at the second marker point. | 03-17-2011 |
20110069302 | Wide Area Seismic Detection - A method for monitoring for seismic events by interrogating an optic fibre which forms part of an existing communications infrastructure to provide distributed acoustic sensing (DAS). The signals provided by the distributed sensing provide measurements at each of a plurality of discrete portions along the fibre, which may be many tens of kilometres in length. Warning or measurement and consequently prediction of seismic activity can be provided by collecting data over a wide area, without the need to deploy a correspondingly large fibre network. | 03-24-2011 |
20110075128 | BIREFRINGENT FIBERS ORIENTATION MEASUREMENT - Methods and apparatus to determine the orientation of randomly arranged birefringent fibers are disclosed. One method comprises emitting light, creating N | 03-31-2011 |
20110075129 | MULTI-PATH INTERFERENCE PERFORMANCE TESTING - A system comprises a laser configured to produce a laser beam and to be optically coupled to a first end of an optical fiber of a device under test, a phase mask configured to selectively pass one of a plurality of modes and to be optically coupled to a second end of the optical fiber of the device under test, and a detector optically coupled to the phase mask and configured to determine an intensity of the beam received over the optical connection from the phase mask. The system may further comprise a data analyzer connected to the detector and in selective communication with the phase mask, wherein the data analyzer is configured to set the phase mask to selectively pass a fundamental mode, set the phase mask to selectively pass a higher order mode, receive intensity data from the detector, and determine a performance in the form of at least one performance factor for said device under test according to said intensity data. | 03-31-2011 |
20110075130 | Selection of a Signal Input from an Optical Fiber Member - Methods and systems for analyzing optical parameters of a selected optical fiber member are disclosed. A signal input from an optical fiber member may be selected by instructing a corresponding optical separation device. The output from the corresponding optical separation device may be combined with the outputs of other optical separation devices using an optical coupler. A measurement circuit may measure the optical parameter from the output. Proper operation of an optical separation device may be validated by a monitoring circuit. The monitoring circuit may provide an indication to a user or may be processed by a diagnostic processor. A processing circuit may select one of the optical separation devices in order to measure the optical parameter for a corresponding optical fiber member and consequently may instruct an adjustment circuit to cause the selected optical fiber member to conform to a desired value of the optical ameter. | 03-31-2011 |
20110085158 | APPARATUS FOR OPTICAL FIBER TESTING - An apparatus for fiber optic testing is presented. In one exemplary embodiment, the apparatus may comprise a plurality of fiber optic connectors for coupling to one or more fiber optic cables, one or more photodetectors operatively connected to the plurality of fiber optic connectors, an optical power measurement module operatively connected to the one or more photodetectors, a display for displaying information received from the optical power measurement module, and one or more user controls for accepting user input. | 04-14-2011 |
20110085159 | FIBER OPTIC END FACE INSPECTION PROBE AND SYSTEM - A fiber optic end face inspection probe that includes a power control, an image control; a probe adaptor and probe end extending from a housing; an electronics module that includes a microprocessor, a memory and an optional wireless transmitter; and an autofocus camera system that includes a lens, a motor adapted to move the lens in order to focus the image through the lens, and an image sensor that is adapted to accept the image passing through the lens and transmit this image to the electronics module. | 04-14-2011 |
20110090486 | FIBER SHAPE SENSING SYSTEMS AND METHODS - In certain variations, fiber shape sensing or measuring systems, devices and methods are described herein, which allow for measurement of three dimensional bending as well as twist measurements of various fibers, e.g., optical fibers and fiber optic probes of various sizes. In certain variations, the systems are designed to take advantage of unique light guiding properties of optical fibers and various fiber gratings. | 04-21-2011 |
20110096323 | OPTICAL-FIBER CONNECTOR WITH ACCURATE MEASURING REFERENCE - An optical-fiber connector includes an insulative main body having a pair of optical components extending forwardly therefrom. Each optical component defines at least one lens and a guiding post located at outside of the lens. Each guiding post defines a through hole extend through the guiding post and the main body in a front-to-back direction and fulfilled with the air for transmitting a test light. The test light from the through hole of the guiding post acts as an accurate measuring reference of the true position between the lens and the fiber because of having no displacement of the light path through a through hole. | 04-28-2011 |
20110102773 | IDENTIFICATION APPARATUS OF OPTICAL CABLE AND IDENTIFICATION METHOD - An optical cable identification apparatus is disclosed. The optical cable identification apparatus capable of identity an optical cable by disturbing an optical fiber, existing inside an optical cable desired to be identified, from an outside. An optical unit transmits two optical signals to a single strand of optical fiber inside the optical cable, and detects a phase difference, a time difference, and light intensity between two optical signals which are reflected due to the disturbance from the outside. A single-fiber ending unit generates the time difference. A signal processing unit removes noise from the two reflected optical signals and demodulates the optical signals. A sound output unit outputs the optical signals from the signal processing unit as sounds. | 05-05-2011 |
20110109898 | OPTICAL POSITION AND/OR SHAPE SENSING - An accurate measurement method and apparatus are disclosed for shape sensing with a multi-core fiber. A change in optical length is detected in ones of the cores in the multi-core fiber up to a point on the multi-core fiber. A location and/or a pointing direction are/is determined at the point on the multi-core fiber based on the detected changes in optical length. The accuracy of the determination is better than 0.5% of the optical length of the multi-core fiber up to the point on the multi-core fiber. In a preferred example embodiment, the determining includes determining a shape of at least a portion of the multi-core fiber based on the detected changes in optical length. | 05-12-2011 |
20110116080 | METHOD OF MEASURING OPTICAL LOSS AND APPARATUS FOR MEASURING OPTICAL LOSS - The invention is to provide an optical loss measuring method and an optical loss measuring apparatus capable of efficiently measuring an optical loss occurring to a target for measurement. The other optical loss measurement method comprising the steps of inputting light outputted from a light source to a target for measurement to thereby measure an output level of the target for measurement with the use of an optical power meter, maintaining the output level of the light source at a predetermined fixed value, and finding the optical loss occurring to the target for measurement on the basis of the output level of the light source maintained at the fixed value for use as the reference value. | 05-19-2011 |
20110122401 | Method and Apparatus For Verifying the Termination Quality of an Optical Fiber Interface in a Fiber Optic Cable Connector - A method and apparatus for verifying the termination quality of an optical fiber interface in a fiber optic connector is provided. The test apparatus generally comprises a light source providing light to a test connector which contains an interface of a stub fiber of a fiber optic connector and a field fiber of a fiber optic cable. The portions of the test connector that are located between the optical fiber optic interface and the light detector are transmissive while other portions of the test connector located near the interface are highly reflective. | 05-26-2011 |
20110141457 | OPTICAL TIME-DOMAIN REFLECTOMETER - A optical time domain reflectometer (OTDR) which sends and receives pulses for multiple frequencies down a fiber under testing (FUT). These frequencies can include frequencies for testing a live FUT and frequencies for testing a dark FUT. The pulses of the various frequencies are sent and received through a single optical connection with the FUT. The number of connections necessary to test the fiber is thus reduced. The OTDR may also include a built in passive optical network (PON) power meter, which measures the power level of the fiber over the same single optical connection. | 06-16-2011 |
20110141458 | Coated Optical Fiber Identifying Apparatus and Coated Optical Fiber Identifying Method - A coated optical fiber identifying apparatus is provided, which can realize coated optical fiber identification for a single mode optical fiber with holes. The coated optical fiber identifying apparatus comprises a grating forming tool | 06-16-2011 |
20110141459 | OPTICAL FIBER SENSING SYSTEM - Provided is an optical fiber sensing system that can carry out measurement accurately without being affected by measurement noise factors other than the physical-quantity attribute of a measurement target object, for example, the effects of the emission power of a light source, fiber insertion loss, fluctuations in the sensitivity of a photo detector, fluctuations in the amplitude of an amplifier or other fluctuations, the loss of optical energy due to the bending of an optical fiber (bending loss), the loss of optical energy due to the connecting of two or more optical fibers by means of connectors (connector loss), the gain fluctuations of electric circuitry provided on a platform, and so forth. A reflective sensor is connected to an end of an optical fiber connected to a light source. The light source outputs physical measurement light. Reflected light coming from the reflective sensor is separated into two beams of light. Information on the physical quantity of a measurement target object is detected on the basis of an intensity ratio of the two beams. | 06-16-2011 |
20110149270 | Enhanced OTDR Sensitivity by Utilizing Mode-Field Diameter Measurements - Described herein are systems and methods for enhancing sensitivity of an optical time-domain reflectometer (“OTDR”) using bi-directional analysis techniques. One embodiment of the disclosure of this application is related to a computer readable storage medium including a set of instructions that are executable by a processor. The set of instructions being operable to collect a first set of measurement data at a first resolution to provide a relative backscatter of the fiber, collect a second set of measurement data taken at a second resolution to calculate loss along the length of fiber, and combine the first set of measurement data with the second set of measurement data to calculate the loss along the fiber at the first resolution. | 06-23-2011 |
20110149271 | Enhanced Optical Time-Domain Reflectometer Resolution Using Depolarization of Light Source - Described herein are systems and methods for enhancing the resolution of an optical time-domain reflectometer (“OTDR”). One embodiment of the disclosure of this application is related to a device, comprising an optical measuring component collecting a first set of measurement data from a forward trace along an optical fiber with the optical measuring device using depolarized light, and a processing component calculating loss along the length of fiber. The optical measuring device further collects a second set of measurement data from a backward trace along the optical fiber with the optical measuring device using depolarized light. | 06-23-2011 |
20110149272 | Methods and Apparatus for Measuring Insertion Loss in a Fiber Optic Cable Connection - A method and apparatus for measuring the insertion loss of a fiber optic connection is provided. The invention generally comprises a light source providing light to a test connector which contains a juncture of two fiber optic cables. The test connector has one or more opaque portions surrounding the fiber optic juncture. A pyrometer or other heat detection means is then used to measure any temperature increase as a result of light scattered into the opaque portions of the test connector. | 06-23-2011 |
20110157582 | Process for Manufacturing a Microstructured Optical Fibre and Method and System for On-Line Control of a Microstructured Optical Fibre - A manufacturing process of a microstructured optical fibre including a void-containing region, includes the steps of: drawing a microstructured optical fibre along a longitudinal direction from a heated preform, wherein the optical fibre is continuously advanced along the longitudinal direction; directing a radiation beam at a longitudinal position in the longitudinal direction of the optical fibre so as to produce an interference pattern; detecting the interference pattern and producing at least one electrical detection signal corresponding to the interference pattern and including a plurality of signal fringe cycles; feeding the first detection signal into a first counter circuit; determining a first number of interference fringe increments in the plurality of signal wave fringe cycles of the at least one detection signal by using the first counter circuit; determining the outer diameter of the optical fibre, and controlling the microstructure of the optical fibre during advancement of the optical fibre. The step of controlling includes at least one step selected from: (a) controlling the first number of interference fringe increments within a reference number range of reference numbers of interference fringe increments, and (b) calculating a microstructure length value. | 06-30-2011 |
20110181871 | COMBINED SWEPT-CARRIER AND SWEPT-MODULATION FREQUENCY OPTICAL FREQUENCY DOMAIN REFLECTOMETRY - An apparatus for estimating a parameter, the apparatus includes: an optical fiber; a component in communication with the optical fiber and configured to interact with light at a wavelength related to the parameter; and an optical interrogator in communication with the optical fiber and configured to: illuminate the optical fiber with a series of light inputs, each light input in the series having a substantially constant unique optical wavelength and swept-frequency amplitude modulation; and receive a resulting light signal associated with each light input in the series; wherein the resulting light signals associated with the series of light inputs are used to estimate the parameter. | 07-28-2011 |
20110194102 | Fiber Optic Building Monitoring System - A building roof monitoring system that includes a fiber optic filament positioned between a water barrier layer (e.g., roof membrane) and a roof substrate layer of the building roof. The fiber optic filament may be part of a sensing layer that includes the fiber optic filament carried by a water transport layer configured to draw water coming into contact with the water transport layer into contact with the fiber optic filament. An optical analyzer injects laser light into the fiber optic filament and detects changes in propagation of the laser light through the fiber optic filament indicative of water coming in contact with the fiber optic filament to detect a roof leak. A response system including a controller, alarm or remote communication unit operatively connected to the optical analyzer responds to the roof leak detected by the optical analyzer. | 08-11-2011 |
20110199607 | DETECTING A DISTURBANCE IN THE PHASE OF LIGHT PROPAGATING IN AN OPTICAL WAVEGUIDE - A partially coherent Optical Time Domain Reflectometry (OTDR) apparatus has a light source comprising a directly modulated semiconductor Distributed FeedBack (DFB) laser diode for transmitting partially coherent light pulses along a monomode optical fibre. Light Rayleigh backscattered from the light pulses as they travel along the optical fibre is output from the end of the fibre into which the light pulses are transmitted to a Fibre Bragg Grating (FBG) filter. The FBG filter reduces the supectral width of light received at a photodetector. In one embodiment, the supectral width of the FBG filter is around one fifth of the supectral width of the light pulse after it has travelled around 1 km along the optical fibre. As a consequence of reducing the supectral width of the light received at the photodetector, the FBG filter increases the temporal coherence of the light. So, the FBG filter can ensure that the detected light is sufficiently coherent that a temporal supeckle pattern can be detected at the photodetector. At the same time, the light traveling in the optical fibre can be relatively supectrally broad so that non-linear effects in the optical fibre, such as Brillouin scattering, can be reduced. | 08-18-2011 |
20110205531 | WAVELENGTH DISPERSION MEASUREMENT METHOD AND DEVICE AND OPTICAL TRANSMISSION SYSTEM - A wavelength dispersion measurement method includes generating a plurality of test lights in the first terminal, the wavelengths of which are different from a wavelength of a signal light, multiplexing each test light with the signal light and outputting the multiplexed light to the first transmission path, reconverting each electrical signal after converting each beam into electrical signals, multiplexing each test light with the signal light and outputting the multiplexed light to the second transmission path, reconverting each electrical signal after converting each test light into electrical signals, multiplexing each test light with the signal light and outputting the multiplexed light to the first transmission path, measuring times for each test light to be propagated up to a specified number of go-around, and measuring a change of a wavelength dispersion amount in the paths based on a difference between the measured propagation times of each wavelength. | 08-25-2011 |
20110205532 | INSPECTION METHOD FOR INSPECTING CORROSION UNDER INSULATION - The present invention realizes an inspection method for inspecting corrosion under insulation. This inspection method according to the present invention makes it possible to inspect corrosion easily and economically in piping furnished with heat insulators. The inspection method is an inspection method for inspecting corrosion under insulation, in piping to which an heat insulator is provided, and includes providing a fiber optical Doppler sensor to the piping; and inspecting the corrosion in the piping by using the fiber optical Doppler sensor. | 08-25-2011 |
20110222052 | TEST SYSTEMS THAT INCLUDE A CENTERING SYSTEM FOR ALIGNING AN OPTICAL PULSE LAUNCHING DEVICE WITH A MULTI-MODE FIBER AND METHODS OF OPERATING THE SAME - A test system for a multi-mode fiber comprises a launching device that is configured to generate optical pulses and has a rest position. A centering system is operable to move the launching device in a circular motion having a center corresponding to the rest position and a diameter corresponding to a core diameter of the multi-mode fiber. The centering system is further operable to adjust a position of the multi-mode fiber relative to the launching device while the launching device is moving in the circle until an optical power coupled from the launching device into the multi-mode fiber is below a threshold. The centering system optically centers the launching device with the multi-mode fiber by fixing the position of the multi-mode fiber responsive to the optical power coupled from the launching device into the multi-mode fiber being below the threshold and returning the launching device to the rest position. In addition, the centering system can move the launching device in a circular motion to launch optical pulses into a multi-mode fiber to perform differential mode delay measurements, which may result in better screening of any circular inhomogeneity of the core of the multi-mode fiber. | 09-15-2011 |
20110228259 | OPTICAL FIBER ALIGNMENT MEASUREMENT METHOD AND APPARATUS - A measurement system comprising an analog position sensitive device is provided that can measure the XY position of a plurality of light beams at very high resolution. In accordance with one exemplary associated method, a connector bearing one or more optical fibers is fixedly positioned before a position sensing detector so that light emanating from the ends of the optical fibers will strike the position sensing detector. A light beam is passed through at least one opening in the connector, such as a guide pin hole onto the detecting surface of the PSD to establish the position of the connector. Next, each optical fiber in the connector is individually illuminated sequentially so that the light emanating from the fiber falls on the position sensing detector. The locations of all of these light beams striking the PSD are compared to position of the light beam passed through the guide pins and/or to each other to determine if all the fibers are in the correct positions relative to the connector. In addition, it is possible to simultaneously measure the magnitude of the light emanating from each fiber in order to measure the quality of the light transmission through the connector/cable assembly. | 09-22-2011 |
20110228260 | SYSTEM AND METHOD FOR MEASURING AN OPTICAL FIBER - Subject matter disclosed herein relates to measuring optical fibers or measuring devices comprising optical fibers and, in particular, to measuring a variation of refractive index of an optical fiber as a function of position and wavelength. | 09-22-2011 |
20110235023 | RETURN LOSS MEASUREMENT SYSTEM - A method may include injecting a test signal having a first optical launch power into a device under test via an optical splitter. The optical splitter includes at least two upstream ports and a downstream port and the test signal is injected in a first upstream port of the optical splitter. The device under test is coupled to the downstream port. Return loss associated with the device under test is measured at a second upstream input of the optical splitter. The RL measurement in stored a database. The injecting, measuring, and storing are repeated for a number of different optical launch powers. | 09-29-2011 |
20110235024 | METHOD, APPARATUS AND SYSTEM FOR MINIMALLY INTRUSIVE FIBER IDENTIFICATION - A method, apparatus and system for minimally intrusive fiber identification includes imparting a time-varying modulation onto an optical signal propagating in an optical fiber and subsequently detecting the presence of the time-varying modulation in the optical signal transmitting through the fiber to identify the fiber. In a specific embodiment of the invention, a time-varying curvature is imposed on the fiber to be identified and the presence of the resultant time variation in the transmitted power of a propagating optical signal is subsequently detected for identification of the manipulated fiber. | 09-29-2011 |
20110242525 | Redundant Optical Fiber System and Method for Remotely Monitoring the Condition of a Pipeline - An optical fiber sensor system and method for monitoring a condition of a linear structure such as a pipeline is provided which is capable of providing continuous monitoring in the event of a break in the sensing optical fiber or fibers. The system includes at least one sensing fiber provided along the length of the linear structure, and first and second interrogation and laser pumping sub-systems disposed at opposite ends of the sensing fiber, each of which includes a reflectometer. The reflectometer of the first interrogation and laser pumping sub-system is connected to one end of the sensing fiber. The reflectometer of the second interrogation and laser pumping sub-system is coupled to either (i) an end of a second sensing fiber provided along the length of the linear structure which is opposite from the one end of the first sensing fiber, or (ii) the opposite end of the first sensing fiber. Before any break of the sensing fiber or fibers occurs, each reflectometer redundantly monitors the condition of the linear structure over its entire length. After any such break occurs, each reflectometer will continue to receive signals up to the point of the break from opposite ends of the structure. | 10-06-2011 |
20110255077 | Distributed Optical Fibre Sensor - A distributed optical fibre sensor is described. The sensor uses a sensor fibre ( | 10-20-2011 |
20110255078 | INTERROGATOR FOR A PLURALITY OF SENSOR FIBER OPTIC GRATINGS - An interrogator for a plurality of sensor fiber optic gratings. The interrogator includes a broadband optical source; at least one beam splitter directing output of the optical source to the sensor fiber optic gratings; at least one linear filter for converting changes in peak reflection wavelength to changes in intensity; at least one optical receiver; and at least one amplifier associated with each optical receiver. The interrogator also includes, alternatively, a driver/modulator for the optical source providing on/off pulses; an analog integrator following the at least one amplifier; or a mechanism compensating for masking of one sensor fiber optic grating by another. | 10-20-2011 |
20110267602 | Testing An Optical Fiber Connection - For testing whether an optical fiber is properly connected to a device, a beam of light is output to the optical fiber. An intensity is detected of light reflected by the device back through the optical fiber in response to the beam of light. In response to the detected intensity, a determination is made of whether the optical fiber is properly connected to the device. | 11-03-2011 |
20110292378 | METHOD AND APPARATUS FOR USING OPTICAL FEEDBACK TO DETECT FIBER BREAKDOWN DURING SURGICAL LASER PROCEDURES - Failure events detected by a laser surgery monitoring feedback circuit are analyzed in order to distinguish between events that result from fiber breakdown and those arising from other sources, such as burning of tissues. If the number of failure events within a predetermined time exceeds a predetermined count, then it is determined that the radiation is the result of fiber breakdown. If the number of failure events within the predetermined time is less than the predetermined count, then it is determined that the failure events result from other causes, such as heating of tissues by the laser. Based on the analysis, an override switch or alarm may be initiated. | 12-01-2011 |
20110317151 | MEDIA STRESS ANALYSIS SYSTEM AND METHOD - A method and system for determining stress associated with a communication device, e.g., an optical fiber, and associated structures are disclosed. An exemplary method includes transmitting an initiated signal through a communication device, and comparing a reflected signal reflected by the communication device with the initiated signal. The method may further include determining a stress associated with the device from at least the comparison of the initiated signal and the reflected signal. | 12-29-2011 |
20120013893 | COMMUNICATION THROUGH AN ENCLOSURE OF A LINE - A communication system can include a transmitter which transmits a signal, and at least one sensing device which receives the signal, the sensing device including a line contained in an enclosure, and the signal being detected by the line through a material of the enclosure. A sensing system can include at least one sensor which senses a parameter, at least one sensing device which receives an indication of the parameter, the sensing device including a line contained in an enclosure, and a transmitter which transmits the indication of the parameter to the line through a material of the enclosure. Another sensing system can include an object which displaces in a subterranean well. At least one sensing device can receive a signal from the object. The sensing device can include a line contained in an enclosure, and the signal can be detected by the line through a material of the enclosure. | 01-19-2012 |
20120013894 | OPTICAL FIBRE NETWORK TEST DEVICE - An optical fibre network test device comprising an actuator that is manually operable, without manual handling of optical fibres, firstly to direct light from a light path of the optical network so that test equipment associated with the network can be operated to test the quality of the said light path, and secondly to return the light path to its previous state after completion of the test. | 01-19-2012 |
20120019810 | MULTI-CHANNEL OPTICAL SIGNAL MONITORING DEVICE AND METHOD - A light detector measures optical power of light incident thereon. Using a beam steering device that is rotatable about two orthogonal axes, wavelength components of different channels are scanned onto the light detector in accordance with programmable parameters. The programmable parameters specify the light detector to which the wavelength components are directed, the order the wavelength components are monitored by the light detector, and the time duration over which each of the wavelength components is monitored by the light detector. | 01-26-2012 |
20120033205 | SENSOR HEAD AND OPTICAL SENSOR - A sensor head for an optical pressure sensor according to the present invention includes: a light-emitting optical fiber for transmitting light emitted from a light source; a reflecting plate whose position relative to an end surface of the light-emitting optical fiber moves in accordance with a pressure and which reflects the light emitted from the end surface of the light-emitting optical fiber; a first optical fiber and a second optical fiber, each of which has an end surface that the light reflected by the reflecting plate enters, the first optical fiber transmitting the light thus entered to a first photodetector and the second optical fiber transmitting the light thus entered to a second photodetector; and a light-intensity variation section that changes a transmission loss in the light-emitting optical fiber in accordance with a change in humidity in the sensor head. | 02-09-2012 |
20120033206 | CABLE INSTALLED STATE ANALYZING METHOD AND CABLE INSTALLED STATE ANALYZING APPARATUS - An image of an installed state of an optical fiber is captured by a camera. The optical fiber is provided with position marks at fixed intervals, the position marks each indicating a distance from a predetermined position and a direction of the optical fiber. An installed state analyzing apparatus performs image processing on the captured image and analyzes the installed state of the optical fiber by using the optical fiber installation tools and the position marks. | 02-09-2012 |
20120038909 | OPTICAL PULSE TEST APPARATUS AND METHOD OF TESTING OPTICAL TRANSMISSION PATH - [Task] To enable a test of an optical transmission path using an MMF with a simple configuration in an optical pulse test apparatus which is used for an SFM for long-distance transmission. | 02-16-2012 |
20120044481 | SEMICONDUCTOR LIGHT EMITTING ELEMENT, DRIVING METHOD OF SEMICONDUCTOR LIGHT EMITTING ELEMENT, LIGHT EMITTING DEVICE, AND OPTICAL PULSE TESTER USING LIGHT EMITTING DEVICE - [Task] To provide a semiconductor light emitting element capable of emitting light beams with wavelengths in a plurality of wavelength ranges with a high optical output, a driving method of a semiconductor light emitting element capable of making a semiconductor light emitting element that can emit light beams with wavelengths in a plurality of wavelength ranges operate with a high optical output, a light emitting device, and a small and high-performance optical pulse tester using the light emitting device. | 02-23-2012 |
20120044482 | MEASURING METHOD OF HOLE DIAMETER, HOLE POSITION, HOLE SURFACE ROUGHNESS, OR BENDING LOSS OF HOLEY OPTICAL FIBER, MANUFACTURING METHOD OF HOLEY OPTICAL FIBER, AND TEST METHOD OF OPTICAL LINE OF HOLEY OPTICAL FIBER - A measuring method of a hole diameter of a holey optical fiber includes calculating an arithmetical mean value I(x) from two backscattering light intensities at a position x of two backscattering light waveforms of the holey optical fiber, in which the two backscattering light waveforms are obtained by OTDR measurement; and obtaining the hole diameter at the position x, based on a correlation between an arithmetical mean value I(x) and an hole diameter of the holey optical fiber that is obtained in advance. | 02-23-2012 |
20120044483 | METHOD AND APPARATUS FOR MEASURING EXIT ANGLE OF OPTICAL FIBER - An object is to improve the repeatability of measurements of an exit angle of an optical fiber, facilitate a measuring operation, and accurately measure exit angles of many optical fibers in a short time. A measurement end of an optical fiber is passed through a through hole of a holder. While the optical fiber is being rotated by using the through hole as a guide, output light from the measurement end is received by light receiving means. Coordinates of at least three points on a locus circle of the output light are measured to calculate a size of the locus circle. On the basis of the calculated size, the exit angle of the optical fiber is measured. The through hole of the holder has a small-diameter portion on a front side and a large-diameter portion on a rear side. An inside diameter of the small-diameter portion is 0.1 μm to 1.0 μm larger than a diameter of a bare fiber, and an inside diameter of the large-diameter portion is larger than a diameter of a sheathed fiber. The object described above is thus achieved. | 02-23-2012 |
20120062875 | SYSTEM FOR IMPROVING THE DYNAMIC RANGE AND REDUCING MEASUREMENT UNCERTAINTY IN FIBRE OPTIC DISTRIBUTED SENSORS AND FIBRE OPTIC DISTRIBUTED MEASUREMENT EQUIPMENT - The present disclosure is based on distributed amplification based on the Raman Effect, consisting of one or more pump lasers ( | 03-15-2012 |
20120075621 | OPTICAL FIBER CONNECTOR - The present invention relates to an optical fiber connector, which comprises a tube member, an optical-fiber module, a positioning member, and a position-limiting member. The back end of the tube member puts around a light-source module or an inspection module. The optical-fiber module is disposed at the front end of the tube member. The positioning member is disposed in the optical-fiber module. The position-limiting member puts around the positioning member and is disposed in the optical-fiber module. Thereby, when a user measures or inspects the optical fiber, the position-limiting member is used for limiting the assembly position of the optical fiber. Besides, the positioning member is used for aligning the optical fiber with the inspection module or the light-source module accurately. Thereby, the alignment of optical fibers can be performed in convenience. | 03-29-2012 |
20120081696 | DISTRIBUTED OPTICAL CHEMICAL SENSOR - The invention relates to a sensor system comprising a waveguide, which waveguide comprises a grating in at least a part of the waveguide, which waveguide further comprises a coating, the coating comprising a polymer, which polymer comprises a chain, in which chain are present an aromatic group and a chemical group selected from the group of sulfonyl groups, carbonyl groups, carbonate groups, fluorocarbon groups, siloxane groups, pyridine groups and amide groups. | 04-05-2012 |
20120086935 | IDENTIFIABLE VISIBLE LIGHT SOURCES FOR FIBER OPTIC CABLES - A system that incorporates teachings of the present disclosure may include, for example, a method including generating a plurality of identifiable visible light sources having at least one constant visible light source and at least one oscillating visible light source and selectively applying, such as one at a time, at least two identifiable visible light sources among the plurality of identifiable visible light sources to a fiber optic cable strand in order to remotely test a fiber optic cable having a plurality of strands including the fiber optic cable strand. Other embodiments are disclosed. | 04-12-2012 |
20120092651 | Multimode Optical Fiber Insensitive to Bending Losses - A method of selecting a multimode optical fiber includes determining a first modal bandwidth value BW for each of a plurality of multimode optical fibers in a straight position and determining a second modal bandwidth value bBW for each of a plurality of multimode optical fibers in a bent position. Typically, the method includes selecting the multimode optical fibers for which the second modal bandwidth value bBW is greater than a threshold bandwidth A. The threshold bandwidth A may be (i) a function of the multimode optical fiber's first modal bandwidth value BW and a bending-loss value BL and (ii) greater than the multimode optical fiber's first modal bandwidth value BW. | 04-19-2012 |
20120099099 | Method for Designing and Selecting Optical Fiber for use with a Transmitter Optical Subassembly - A method for compensating for both material or chromatic dispersion and modal dispersion effects in a multimode fiber transmission system is provided. The method includes, but is not limited to measuring a fiber-coupled spatial spectral distribution of the multimode fiber laser transmitter connected with a reference multimode fiber optical cable and determining the amount of chromatic dispersion and modal dispersion present in the reference multimode fiber optic cable. The method also includes, but is not limited to, designing an improved multimode fiber optic cable which compensates for at least a portion of the chromatic dispersion and modal dispersion present in the reference multimode fiber optic cable resulting from the transmitter's fiber-coupled spatial spectral distribution. | 04-26-2012 |
20120105831 | MEASURING MODAL CONTENT OF MULTI-MODED FIBERS - The output modal content of optical fibers that contain more than one spatial mode may be analyzed and quantified by measuring interference between co-propagating modes in the optical fiber. By spatially resolving the interference, an image of the spatial beat pattern between two modes may be constructed, thereby providing information about the modes supported by the optical fiber. Measurements of the phase front exiting the optical fiber under test are advantageously performed in the far field. | 05-03-2012 |
20120120389 | Monitoring Fibers in an Optical Ribbon Cable - A system for monitoring an optical cable includes a cable having monitor fibers solely for monitoring cable status. The monitor fibers may be fibers selected from optical fibers having a higher mechanical sensitivity to mechanical stresses than other fibers in the cable, which may attenuate earlier than the other fibers in the event of cable degradation. The monitor fibers may be in communication with a transmitter and receiver, for transmitting and receiving a monitor signal. The receiver may be in communication with an alarm, the alarm being operative to send an alert signal when an increased attenuation is detected from the monitor signal, the increased attenuation being indicative of the status of the optical cable. | 05-17-2012 |
20120127459 | Distributed Optical Fibre Sensing - There is disclosed a distributed optical fibre sensing system in which the sensor fibre comprises at least first and second waveguides used for separate sensing operations. The sensor fibre may be, for example, a double clad fibre having a monomode core and a multimode inner cladding. | 05-24-2012 |
20120140207 | FIBER OPTIC PORT SIGNATURE APPLICATOR - An apparatus for illuminating optical fibers, said apparatus includes a housing having a face; fiber ports disposed on said face, each of said fiber ports being configured to engage a connector on an optical fiber; port lamps, each being disposed to provide light through a corresponding one of said fiber ports; and a control system configured to cause said port lamps to provide light according to corresponding port signatures, said port signatures being distinct from each other. | 06-07-2012 |
20120140208 | GUIDED-MODE RESONANCE SENSORS EMPLOYING ANGULAR, SPECTRAL, MODAL, AND POLARIZATION DIVERSITY FOR HIGH-PRECISION SENSING IN COMPACT FORMATS - A guided mode resonance (GMR) sensor assembly and system are provided. The GMR sensor includes a waveguide structure configured for operation at or near one or more leaky modes, a receiver for input light from a source of light onto the waveguide structure to cause one or more leaky TE and TM resonant modes and a detector for changes in one or more of the phase, waveshape and/or magnitude of each of a TE resonance and a TM resonance to permit distinguishing between first and second physical states of said waveguide structure or its immediate environment. | 06-07-2012 |
20120162639 | OPTICAL SENSOR AND METHOD OF USE - An interferometer apparatus for an optical fibre system and method of use is described. The interferometer comprises an optical coupler and optical fibres which define first and second optical paths. Light propagating in the first and second optical paths is reflected back to the optical coupler to generate an interference signal. First, second and third interference signal components are directed towards respective first, second and third photodetectors. The third photodetector is connected to the coupler via a non-reciprocal optical device and is configured to measure the intensity of the third interference signal component directed back towards the input fibre. Methods of use in applications to monitoring acoustic perturbations and a calibration method are described. | 06-28-2012 |
20120176606 | METHOD AND APPARATUS FOR DISTURBANCE DETECTION - A sweep sensor may include a signal source, a propagation medium, and a detector. By transmitting an interrogating signal from the signal source into the propagation medium, detectable disturbances along the medium can physically alter the characteristics of the medium, which may cause a measurable change in the backscattered signal at the detector. Based on the change, it may be possible to locate the geographic origins of the physical disturbances along the propagation medium, or to determine the nature of the disturbances, or both. For example, it is generally possible to estimate the approximate distance between the detector and the disturbance given the time required to obtain the backscattered signal and the velocity of the signal source in the propagation medium. Further, in some embodiments, it is possible to quantify the amount of disturbance. | 07-12-2012 |
20120176607 | Testing of Optical Cable Using Optical Time Domain Reflectometry - Methods for testing optical equipment are disclosed. One method includes connecting an optical time domain reflectometer to optical equipment to be tested, the optical equipment including at least one optical connector. The method includes injecting an optical signal onto the optical equipment from the optical time domain reflectometer, and observing an amount of reflected light at the connector. Based on the observed reflected light, an amount of loss attributable to the optical equipment is determined. | 07-12-2012 |
20120188533 | Phase Based Sensing - A method of distributed acoustic sensing (DAS) whereby the derivative or rate of change of a signal backscatted from a fibre is measured. The change, or derivative of the phase measured in this way has a much smaller amplitude than the signal itself if the difference between the two times at which the signal is measured is much less than the period of the signal being measured, resulting in lower sensitivity. Frequency shifts can be applied to temporally displaced return signals to compare the rate of change, for example by employing an output interferometer arranged to modulate the signal in each arm by a different frequency shift. | 07-26-2012 |
20120200846 | OPTICAL TIME DOMAIN REFLECTOMETER USER INTERFACE - An OTDR user interface including a setup menu that includes a plurality of user settings capable of displaying information corresponding to a test, wherein each of the plurality of user settings is capable of displaying information corresponding to a different aspect of the test, and wherein one of the plurality of user settings is a dynamic range setting capable of displaying a dynamic range of the test. | 08-09-2012 |
20120206718 | Stimulated Brillouin System with Multiple FBG's - A Brillouin system for monitoring both temperature and strain includes either a single or double-ended fiber with multiple fiber Bragg gratings (FBG's) at different wavelengths and a pumped seed laser system tunable over a range substantially larger than a Brillouin shift. The FBG's are distributed along the length of the deployed fiber and serve as wavelength selectable reflectors that enable maintaining system operation even in the case of a fiber break. | 08-16-2012 |
20120224167 | APPARATUS AND METHOD FOR CHEMICAL, BIOLOGICAL AND RADIOLOGICAL AGENT SENSING - Apparatus and method for chemical, biological and radiological agent sensing. The sensing apparatus includes a plurality of resonators each having a resonance frequency and an optical fiber coil. The optical fiber coils have cladding and an indicator embedded in the cladding that reacts to an agent (chemical or biological substance) or a dopant that darkens with radiation. The resonator circulates light through the coil and produces a resonance shape centered at the resonance frequency and measured via the input light. A predetermined change in the resonance shape indicates a presence of the agent in the environment. | 09-06-2012 |
20120224168 | OPTICAL COMMUNICATION MODULE AND OPTICAL FIBER COMMUNICATION SYSTEM - Bending of an optical fiber where a heat may be generated by a high output power can be detected without using a dedicated light source. An optical communication module that outputs a continuous wave light generated by at least one light source to an optical fiber transmission line, includes: (1) a loss measurement unit that measures a loss of an amplified spontaneous emission generated by allowing the continuous wave light output from the light source to create stimulated Raman scattering in the optical fiber transmission line; (2) a fiber abnormality analyzer that detects the abnormal state of the optical fiber transmission line on the basis of loss information on the ASE measured by the loss measurement unit; and (3) a light source controller that controls a supply state of the continuous wave light from the light source on the basis of the detection of the fiber abnormality analyzer. | 09-06-2012 |
20120224169 | OPTICAL FIBER VIBRATION SENSOR - A Sagnac interference type optical fiber vibration sensor includes two optical fiber loops arranged along a structure, and a vibration sensor main body which detects the vibration caused to the structure via the two optical fiber loops. A sensitivity of one of the two optical fiber loops for detecting a vibration decreases with a distance from one end to an other end, while a sensitivity of an other of the two optical fiber loops increases with a distance from the one end to the other end. The main body includes a portion for determining whether the vibration occurred to the structure based on a sum of outputs produced via the two optical fiber loops, and a portion for determining a position where the vibration occurred based on an output ratio which is a difference between the outputs produced which is divided by the sum of the outputs produced. | 09-06-2012 |
20120224170 | OPTICAL NODE APPARATUS, METHOD FOR CHECKING CONNECTION IN NODE APPARATUS AND PROGRAM THEREOF - An optical node apparatus whose plural function units are connected each other through an optical transmission line includes a control unit which carries out control to send an optical test signal and to stop sending the optical test signal a sending unit which sends the optical test signal on the basis of an instruction issued by the control unit a receiving unit which receives the optical test signal sent by the sending unit through the optical transmission line and a discriminating unit which discriminates whether the receiving unit receives the optical test signal. | 09-06-2012 |
20120236294 | Optical Fiber Fault Locator - A method includes applying pulsed light to a first end of an optical fiber from an optical fault locator during a first distance test. The method includes determining an estimated distance to a fault based on the pulsed light. The method includes sending information indicative of the estimated distance to a remote device. The method also includes applying first visible light from the optical fault locator to the first end of the optical fiber to facilitate identification of the fault at a first site that is remote from the first end of the optical fiber. | 09-20-2012 |
20120236295 | METHOD OF MEASURING BENDING PERFORMANCE OF OPTICAL FIBER - A method of measuring the bending performance of an optical fiber in a simple manner is provided. Power P | 09-20-2012 |
20120250007 | Efficient Silicon-On-Insulator Grating Coupler - An efficient grating coupler for a semiconductor optical mode includes a tapered edge to couple light between waveguide modes constrained by differing waveguide thicknesses. An optical circuit or laser has a waveguide in a rib or strip waveguide section that is of different height (e.g., having different vertical constraints) than a waveguide section that has a grating coupler through which light passes off-circuit. The tapered edge can couple light between the two waveguide sections with very low loss and back-reflection. The low loss and minimal back-reflection enables testing of the photonics circuit on a wafer level, and improved performance through the grating coupler. | 10-04-2012 |
20120250008 | MEASURING METHOD FOR CROSSTALK BETWEEN CORES IN MULTI-CORE OPTICAL FIBER - The present invention obtains a statistical distribution of inter-core crosstalk by measuring the inter-core crosstalk of a multi-core optical fiber while changing the wavelength of incident light in a predetermined range including a specific wavelength relative to the multi-core optical fiber, or while changing a polarization state of incident light entering the multi-core optical fiber. According to the present invention, there is no need to measure the crosstalk by rewinding the multi-core optical fiber and changing the phase difference between cores around the zero point of the equivalent propagation constant difference between cores. | 10-04-2012 |
20120257193 | MINIATURIZED ON-LINE TRACE ANALYSIS - The invention relates to a measuring apparatus comprising an apparatus for forming a liquid optical waveguide having a substrate ( | 10-11-2012 |
20120262706 | METHOD OF MEASURING CUT-OFF WAVELENGTH OF OPTICAL FIBER - A cut-off wavelength measuring method according to the present invention includes: preparing a single mode fiber as a reference fiber; preparing a measurement target fiber; adjusting the length of the single mode fiber such that the length of the single mode fiber is longer than the that of the measurement target fiber at the time of measuring power of transmission light and the reference fiber propagates only light of a base mode at a predicted cut-off wavelength of the measurement target fiber; measuring wavelength dependence of power of light transmitted through the reference fiber and wavelength dependence of power of light transmitted through the measurement target fiber; and calculating a cut-off wavelength of the measurement target fiber based on wavelength dependence represented as the ratio of the power of transmission light transmitted through the measurement target fiber to the power of light transmitted through the reference fiber. | 10-18-2012 |
20120274926 | Distributed Brillouin Sensing Systems and Methods Using Few-Mode Sensing Optical Fiber - A distributed Brillouin optical fiber sensing system employs a sensing optical fiber that supports two or more (i.e., few) guided modes. Pump light supported by one of the guided modes is used to form a dynamic Brillouin grating (DBG). Probe light supported by at least one of the other guided modes interacts with the DBG to form reflected probe light that is received and analyzed to determine a Brillouin frequency shift and a reflection location, which in turn allows for making a measurement of at least one condition along the sensing optical fiber. Supporting the pump and probe light in different guided modes results in the optical fiber sensing system having a higher spatial resolution than sensing systems where the pump light and probe light share a common guided mode. | 11-01-2012 |
20120274927 | DISTRIBUTED BRILLOUIN SENSING SYSTEMS AND METHODS USING FEW-MODE SENSING OPTICAL FIBER - Some embodiments of a distributed Brillouin optical fiber sensing system employs a sensing optical fiber that supports two or more (i.e., few) guided modes. Pump light supported by one of the guided modes is used to form a dynamic Brillouin grating (DBG). Probe light supported by at least one of the other guided modes interacts with the DBG to form reflected probe light that is received and analyzed to determine a Brillouin frequency shift, a phase matching wavelength between probe and pump light, a reflection location, which in turn allows for making a measurement of at least one condition along the sensing optical fiber. Supporting the pump and probe light in different guided modes results in the optical fiber sensing system being able to simultaneously measure temperature and strain and having a higher spatial resolution than sensing systems where the pump light and probe light share a common guided mode. | 11-01-2012 |
20120274928 | METHOD OF MEASURING CUTOFF WAVELENGTH - A method for accurately measuring the cutoff wavelength of a high order mode of an optical fiber includes a first step of measuring power spectrum P | 11-01-2012 |
20120281205 | METHOD AND APPARATUS FOR MEASURING FIBER TWIST BY POLARIZATION TRACKING - A method of measuring fiber twist in a multi-core optical fiber bearing an FBG with polarization dependent reflectivity. The state of polarization of the launched light is adjusted until the reflected FBG wavelength is maximal, indicating that light reaching the FBG is linearly polarized, and the polarization axis of the light reaching the FBG is aligned with the slow birefringent axis of the FBG; the SOP of launched light is now measured. Bending experienced by the fiber is measured conventionally, and birefringence produced by bending of the multi-core optical fiber is calculated. A candidate amount of twist between the launch location and the FBG is proposed, and the corresponding twist-induced birefringence is calculated. When calculations show that light with the launched SOP becomes linearly polarized and aligned with the FBG after traversing a fiber section with the calculated birefringences and proposed rotation, the amount of twist has been properly identified. | 11-08-2012 |
20120307235 | OPTICAL CABLE MEASUREMENT EQUIPMENT WITH FUNCTION OF OPERATING GUIDANCE - An optical cable measurement equipment with function of operating guidance includes a circuit board, a central processing unit (CPU), a measurement module, an output interface, an input interface and a power supply module. The CPU is arranged on and electrically connected with the circuit board. The measurement module is configured for implementing functions of optical cable measurement. The output interface is configured for outputting a prompting signal to guide a user to operate the optical cable measurement equipment. The input interface is configured for receiving operations of the user and generating a feedback signal. The CPU generates operating instruction according to the feedback signal. The power supply module is configured for providing required power of the optical cable measurement equipment. The above-mentioned optical cable measurement equipment is able to provide operating guidance by prompting signal of sound/voice, light, text or pattern to guide users to complete operating flow. | 12-06-2012 |
20120314209 | Linearity Calibration Standard For Fiber Optic Power Meters - An integrated, more automated system for determining the linearity of measurements of fiber optic power meters reduces the time and expense needed for linearity calibration. The system uses the triplet superposition method of linearity calibration and aids in performing the necessary series of measurements. A linearity measurement system for an optical power meter comprises an apparatus to output an optical signal to the optical power meter, the apparatus configured to output the optical signal at a controllable plurality of optical powers, a controller for controlling an optical power output from the apparatus to the optical power meter, a display device for displaying a state of the apparatus based on information from the controller, and an input device for commanding the controller to control the optical power output from the apparatus to the optical power meter. | 12-13-2012 |
20130021597 | CABLE IDENTIFICATION - A storage area network cable apparatus can include a cable, an identification adaptor disposed in the cable, an illuminator disposed in the identification adaptor, an endpoint adaptor disposed at an end of the cable and an integrated device disposed in the endpoint adapter and configured to generate a frequency in the cable. | 01-24-2013 |
20130021598 | FIBER MEASUREMENT DEVICE - A fiber measurement device includes: a light detector adapted to detect feedback light of laser light output to a fiber; a band limiting circuit adapted to extract, from a signal depending on the feedback light, a signal having a component corresponding to a frequency of the laser light, wherein the signal extracted by the band limiting circuit is a first differentiation target signal; and a waveform equalizing circuit having a differentiating and adding circuit adapted to differentiate the first differentiation target signal to generate a first differentiation result signal and to add the first differentiation target signal and the first differentiation result signal. | 01-24-2013 |
20130027689 | INSPECTING DEVICE, INSPECTING METHOD, AND METHOD FOR MANUFACTURING OPTICAL FIBER - A detector sequentially detects intensity distribution of transmitted light which is transmitted through a center portion of a preform. A determining section determines at least one of a position of a through hole and a size thereof on the basis of a time series of a feature value in the intensity distribution. | 01-31-2013 |
20130038864 | FIBER OPTIC CONNECTOR INSPECTION MICROSCOPE WITH INTEGRAL OPTICAL POWER MEASUREMENT - A fiber optic inspection microscope including an objective lens, an optical detector, an image detector, an illumination source, and first and second beamsplitters, wherein the first beamsplitter is in a first optical path between the objective lens, the image detector and the optical detector, wherein the first beamsplitter allows passage of an optical image to the image detector, wherein the first beamsplitter directs optical energy to the optical detector, wherein the second beamsplitter is in a second optical path between the illumination source and the objective lens, and wherein the second beamsplitter directs light from the illumination source to the objective lens. | 02-14-2013 |
20130038865 | Embedded Optical Time Domain Reflectometer for Optically Amplified Links - Fiber-optic communications systems are provided for optical communications networks. Fiber-optic communications links may be provided that use spans of transmission fiber to carry optical data signals on wavelength-division-multiplexing channels at different wavelengths between nodes. An apparatus and method are disclosed to use one optical light source per node to perform OTDR and LCV to satisfy safety concerns and accelerate the verification of the integrity of optical fiber links, before the application of high Raman laser powered light sources to a fiber link. A system using only one receiver per node is also disclosed. | 02-14-2013 |
20130070237 | Method and Metric for Selecting and Designing Multimode Fiber for Improved Performance - A new metric applicable to the characterization and design of multimode fiber (MMF) is described. The metric is derived from a Differential Mode Delay (DMD) measurement and when used in combination with industry-standard metrics such as Effective Modal Bandwidth (EMB) and DMD, yields a more accurate prediction of MMF channel link performance as measured by Bit Error Rate (BER) testing. The metric can also be used in the design of MMF for improved bandwidth performance. When implemented as a test algorithm in production, it can be used to select, sort, or verify fiber performance. This process can yield a multimode fiber design with a greater performance margin for a given length, and/or a greater length for a given performance margin. | 03-21-2013 |
20130077088 | Optical Fiber Network Test Method of an Optical Frequency Domain Reflectometer - An optical fiber network test method of an optical frequency domain reflectometer, which is to use the optical testing apparatus and method of the prevent invention to combine the characters of filtering, reflecting and transmission of light of the wave reflecting unit, applying on any optical fiber test or point-to-point or point-to-multipoint optical fiber network. Thus, the optical fiber testing apprartus and method is constructed, and the goals of achieving the optical fiber network test method of the optical frequency domain reflectometer or confirming simultaneously the position of the barrier router and the barrier optical fiber connection point/end point/start point can be accomplished. | 03-28-2013 |
20130094015 | TESTING HARDENED FIBER OPTIC CONNECTOR HOUSING - A system includes a first assembly including a fiber optic connector. The system also includes a second assembly to which one end of a rigid arm is rotatingly affixed. Another end of the arm is affixed rigidly to a mass. The system further includes a mechanical device for applying a force to the mass. After the mechanical device applies the force to the mass, the mass swings from and about the second assembly and strikes the fiber optic connector. | 04-18-2013 |
20130100440 | OPTICAL FIBER CURVATURE MEASURING METHOD - An optical fiber curvature measuring method comprising rotatably holding an end of the optical fiber, irradiating two points at a prescribed distance from each other on a side surface of the fiber with a pair of parallel light beams orthogonal to an axial direction, measuring representative positions of scattered and reflected light beams scattered by the side surface as coordinate positions on an axis parallel to the optical fiber axis, calculating a difference between the two coordinate positions, rotating the fiber by a prescribed angle, repeating the calculation of the difference a plurality of times, calculating a positive representative value for amplitude S | 04-25-2013 |
20130148108 | OPTICAL TIME DOMAIN REFLECTOMETER TEST SIGNAL MODULATION CIRCUIT, AND PASSIVE OPTICAL NETWORK SYSTEM AND APPARATUS USING SAME - Embodiments of the present disclosure disclose an OTDR test signal modulation circuit, including a laser diode drive, a laser diode, a current adjusting unit, and an OTDR control unit. The laser diode drive is connected to the laser diode and is configured to drive, according to an input data signal, the laser diode to transmit data light. The current adjusting unit is connected to the laser diode and the OTDR control unit and is configured to adjust a current flowing through the laser diode according to an OTDR test signal provided by the OTDR control unit, so as to modulate the OTDR test signal to the data light transmitted by the laser diode. Moreover, the embodiments of the present disclosure also disclose a passive optical network system and apparatus. | 06-13-2013 |
20130148109 | METHOD AND SYSTEM FOR DETECTING FIBER FAULT IN PASSIVE OPTICAL NETWORK - The disclosure provides a method and a system for detecting a fiber fault in a Passive Optical Network (PON). The system comprises an optical path detection device, a Wavelength Division Multiplexing (WDM) coupler, a wavelength selection coupler, a branch fiber selector and a wavelength selection router. The detection system is attached to an original PON system, without influencing the operation of the original system while performing the detection. With the disclosure, the problem of being unable to determine whether there is a fault in a branch fiber due to the loss of an optical path detection reflection signal is solved, the branch fiber with a fault can be quickly located and fixed, thus the operational and maintenance costs of an operator are reduced. | 06-13-2013 |
20130155391 | METHOD FOR THE CHARACTERIZATION OF OPTICAL PROPERTIES OF AN OPTICAL FIBER - A method for determining optical properties of an optical fiber including providing optical fibers having varying values of an optical property, measuring values of the optical property of the fibers, selecting one of the fibers as a reference fiber, determining the relative backscatter coefficient of the fibers compared to the reference optical fiber, correlating data obtained in step ii) with data obtained in step iv) to obtain a calibration curve showing a correlation between the Rrel and the values of the optical property of the optical fibers, measuring the Rrel of another optical fiber compared to the reference fiber, and determining a value of the optical property of the another optical fiber based on the calibration curve obtained in step v). | 06-20-2013 |
20130176557 | High Q-Factor Conical Optical Microresonator And Utilization In The Location Characterization Of Optical Fibers - A conically tapered optical fiber with a small half-angle γ (e.g., less than 10 | 07-11-2013 |
20130182243 | SYSTEM AND METHOD FOR MEASURING AN OPTICAL FIBER - Subject matter disclosed herein relates to measuring optical fibers, and, in particular, to measuring spontaneous emission produced in an optical fiber. | 07-18-2013 |
20130182244 | OPTICAL DIFFERENTIAL DELAY TESTER - The present invention relates to a device and method for measuring the differential delay in a computer system having a disaster recovery secondary site. The device includes a transmitter for use at a primary site, the transmitter having a first laser and a second laser. The first laser is optically connected to an end of the transmission path and the second laser is optically connected to an end of the receive path. A receiver is located at the secondary site. The receiver has a first optical receiver optically connected to an end of the transmission path and a second optical receiver optically connected to an end of the receive path. The receiver includes a microprocessor to count the number of cycles between the receipt of light pulses simultaneously emitted from the first and second lasers. From this cycle count, the differential delay between the transmission and receive path is calculated. | 07-18-2013 |
20130188174 | Configurable Chiral Fiber Sensor - The inventive configurable chiral fiber sensor is readily configurable for use in a variety of applications (such as applications involving pressure and/or temperature sensing), and which is particularly suitable for applications in which the sensing of a presence or absence of the target sensed event (e.g., specific minimum pressure or minimum temperature) is required. Advantageously, the inventive configurable chiral fiber sensor utilizes light sources, photodetectors, and related devices for sensor interrogation. | 07-25-2013 |
20130188175 | Configurable Chiral Fiber Tip-Positioned Sensor - The inventive configurable chiral fiber sensor with a tip-positioned sensing element, is readily configurable for use in a variety of applications (such as applications involving pressure, temperature, and even axial twist sensing), and is particularly suitable for applications requiring highly precise and accurate sensor readings within corresponding predefined limited sensing ranges. Advantageously, the inventive configurable chiral fiber sensor with a tip-positioned sensing element, is operable to utilize a wide variety of light sources, photodetectors, and related devices for sensor interrogation. | 07-25-2013 |
20130188176 | MONITORING FOR DISTURBANCE OF OPTICAL FIBER - Problems of excessive fading in systems for monitoring single-mode optical fiber for physical disturbances are addressed by launching into the fiber polarized light having at least two different predetermined launch states of polarization whose respective Stokes vectors are linearly-independent of each other; downstream from the first location, receiving the light from the fiber; analyzing the received light using polarization state analyzer means having at least two different analyzer states of polarization that are characterized by respective Stokes vectors that are linearly-independent of each other and detecting the analyzed light to provide corresponding detection signals; deriving from the detection signals measures of changes in polarization transformation properties of the fiber between different times that are substantially independent of said launch states and said detection states; and, on the basis of predefined acceptable physical disturbance criteria determining whether or not the measures are indicative of a reportable physical disturbance. | 07-25-2013 |
20130188177 | MONITORING FOR DISTURBANCE OF OPTICAL FIBER - Problems of excessive fading in systems for monitoring single-mode optical fiber for disturbances are addressed by launching into the fiber polarized light having at least two different predetermined launch states of polarization whose respective Stokes vectors are linearly-independent of each other; downstream from the first location, receiving the light from the fiber; analyzing the received light using polarization state analyzer having at least two different analyzer states of polarization that are characterized by respective Stokes vectors that are linearly-independent and detecting the analyzed light to provide corresponding detection signals; deriving from the detection signals measures of changes in polarization transformation properties of the fiber between different times that are invariant under a non-reflective unitary transformation on either the launch states or the detection states; and, on the basis of predefined acceptable physical disturbance criteria determining whether or not the measures are indicative of a reportable physical disturbance. | 07-25-2013 |
20130194566 | FIELD TESTER FOR TOPOLOGIES UTILIZING ARRAY CONNECTORS AND MULTI-WAVELENGTH FIELD TESTER FOR TOPOLOGIES UTILIZING ARRAY CONNECTORS - A test instrument comprises plural first optical signal sources at a first wavelength and a distributor coupled to the plural first optical signal sources to supply the signals produced to a multi-fiber test port. Additional second wavelength signal sources may be provided, and a second test instrument for use at a second end of the link under test may be provided, to effect testing of the optical link. | 08-01-2013 |
20130201472 | SYSTEMS AND METHODS FOR CANCELING ELECTRICAL CROSSTALK FROM MEASUREMENTS OF OPTICAL SIGNALS - An exemplary optical transmission system comprises an optical subassembly (OSA) coupled to an optical receiver via an optical fiber. The OSA comprises a laser diode configured to transmit optical signals across the optical fiber, and the OSA further comprises an avalanche photodiode (APD) configured to receive optical return signals from the optical fiber. The system further comprises a crosstalk canceller configured to estimate an amount of electrical crosstalk affecting measurements of the return signals in order to cancel such crosstalk from measurements of subsequent optical signals received by the APD. | 08-08-2013 |
20130201473 | POLARIZATION MODE DISPERSION MEASUREMENT BY OBSERVATION OF DATA-BEARING SIGNALS - Embodiments of the invention include systems and methods for measuring or otherwise calculating polarization mode dispersion (PMD) of an optical fiber, or other device, by comparing the optical signal through the PMD element with the optical signal obtained directly from the transmitter, and calculating the PMD from the discrepancy between the two. Any distortions on the transmitter signal are effectively calibrated out, increasing measurement accuracy over conventional approaches. | 08-08-2013 |
20130208264 | INTEGRATED OPTICAL TIME DOMAIN REFLECTOMETER - An optical time domain reflectometry system is described which provides low-power, low weight, optical fiber system integrity measurements in an in-situ optical fiber system. The system can be integrated within the transmitter component to allow both data transmission and OTDR measurement functions. A method of providing several different modes of OTDR measurement through external control is also disclosed. | 08-15-2013 |
20130215417 | SYSTEM AND METHOD FOR DETERMINING OPTICAL DISTRIBUTION NETWORK CONNECTIVITY - A system and method for determining optical distribution network connectivity. In one embodiment, the system includes: (1) a transceiver configured to monitor at least one parameter and (2) a fiber bending device configured to introduce a bend into a particular fiber, the parameter exhibiting a corresponding attenuation when the bend is introduced and indicating a connectivity of the particular fiber. | 08-22-2013 |
20130229649 | OPTICAL BRILLOUIN SENSING SYSTEMS - According to one embodiment, an optical sensing system may include a gated optical amplifier, one or more triggering devices, and an optical coupler. The gated optical amplifier can receive a pulse signal and transform the pulse signal into an amplified pulse signal having an amplified peak portion. The triggering devices can control the gated optical amplifier such that the gated optical amplifier is in the lossy state while the baseline portion of the pulse signal is transformed and the gated optical amplifier is in the gain state while the peak portion of the pulse signal is transformed. The amplified pulse signal can be transmitted to the sensing optical fiber and a sensed optical signal can be received, when the sensing optical fiber is connected to the optical coupler. Optionally, a second pulse signal and the sensed optical signal can be combined and detected with a coherent balanced detection technique. | 09-05-2013 |
20130229650 | SYSTEM AND METHOD OF AN INTEGRATED FIBER OPTIC INSPECTION AND CLEANING APPARATUS - This disclosure concerns a cleaning and inspection system for fiber optics that is rapid, reliable and useful for various types of fiber optics. In an embodiment, the system includes a wide field of view (FOV) camera to image the ferrule and rapidly locate the fiber ends and a narrow FOV camera to provide detailed inspection of fiber ends. A cleaning module with a cleaning tip and a cleaning media that is drawn through the tip is used to clean the fiber ends. Images captured by the dual cameras are automatically enhanced and analyzed to determine the effectiveness of the cleaning process and to identify the types and quantity of defects present. In another embodiment, a single higher resolution camera is provided with a lens that can image an entire fiber array and yet enable defects to be detected by analysis of sub-images of each fiber in the fiber array. | 09-05-2013 |
20130235369 | EVALUATION OF OPTICAL FIBER INTEGRITY - A method of evaluating integrity of a fiber comprises transmitting a measurement light beam through the optical fiber and measuring an intensity of a combined reflection of the measurement light beam. The combined reflection includes a proximal end reflection component and a distal end reflection component. The method further comprises separating the proximal end reflection component from the combined reflection to obtain a calibrated intensity measurement; and analyzing the calibrated intensity measurement to determine the integrity of the optical fiber. | 09-12-2013 |
20130265569 | Brillouin Optoelectronic Measurement Method and Apparatus - The present invention relates to a Brillouin optoelectronic measurement method comprising the step of, providing a signal (s | 10-10-2013 |
20130278923 | FIBER OPTIC PORT SIGNATURE APPLICATOR - An apparatus for illuminating optical fibers, said apparatus includes a housing having a face; fiber ports disposed on said face, each of said fiber ports being configured to engage a connector on an optical fiber; port lamps, each being disposed to provide light through a corresponding one of said fiber ports; and a control system configured to cause said port lamps to provide light according to corresponding port signatures, said port signatures being distinct from each other. | 10-24-2013 |
20130286382 | LIGHT GUIDE PLATE HOLDER AND LIGHT GUIDE PLATE TESTING SYSTEM USING SAME - A light guide plate holder includes a base, a partitioning plate, and two clamping blocks. The base includes a bottom wall and two side walls extending from opposite ends of the bottom wall, the bottom wall and the two side walls cooperatively forming a receiving space. The partitioning plate is positioned on the bottom wall in the receiving space, the partitioning plate partitioning the receiving space into two sub-spaces. The clamping blocks are detachably received in the respective sub-spaces, and each of the clamping blocks is configured for cooperating with the partitioning plate to clamp a light guide plate therebetween. A light guide plate testing system using the light guide plate holder is also provided. The testing system is used for testing microstructures on a light incident surface of a light guide plate. | 10-31-2013 |
20130293874 | OPTICAL LIGHT SOURCE WITH CONTROLLED LAUNCH CONDITIONS - A system, apparatus and method for providing controlled launch conditions to an optical light source comprises adjustable fiber bending/deforming apparatus to allow adjustment of the device such that multimode launch conditions can be accurately controlled. Both LED light source and OTDR/laser implementations are provided | 11-07-2013 |
20130301036 | ARRAY CONNECTOR TEST HARNESS FOR SINGLE-ENDED OPTICAL TEST INSTRUMENTS - A system, apparatus and method for testing optical fiber systems by providing a near-end and far-end harness that loops the set of fibers in the fiber system together. The near-end harness has an interface to connect to the tester. The tester then effects testing on the entire set of fibers, which are looped together by the configuration of the two harnesses creating a single optical path that traverses the entire set or subset of fibers in the network, so a launched test signal propagates through the entire set of looped fibers, providing measurement results for the fibers. | 11-14-2013 |
20130301037 | Distributed Optical Fibre Sensing - There is disclosed a distributed optical fibre sensing system in which the sensor fibre comprises at least first and second waveguides used for separate sensing operations. The sensor fibre may be, for example, a double clad fibre having a monomade core and a multimode inner cladding. | 11-14-2013 |
20130308123 | OPTICAL FIBER CHARACTERISTICS MEASUREMENT DEVICE AND METHOD - Provided is an optical fiber characteristics measurement device that is provided with: a light source for emitting laser light modulated by a specified modulation frequency; an incident means for receiving the laser light from the light source as continuous light and pulse light from one end and the other end of an optical fiber, respectively; and a light detector for detecting light emitted from the optical fiber, the optical fiber characteristics measurement device measuring the characteristics of the optical fiber using the detection results of the light detector, wherein the optical fiber characteristics measurement device is characterized in being provided with a synchronous detector that extracts, from among the detection signals output from the light detector, detection signals obtained by detecting the light in the vicinity of a measurement point set in the optical fiber, and synchronously detects the extracted detection signals using a synchronization signal having a specified period. | 11-21-2013 |
20130342828 | AIRCRAFT SHOCK STRUT HAVING A FLUID LEVEL MONITOR - A system for monitoring a liquid level in an aircraft shock strut includes a cylinder having an internal chamber sealed by a piston telescopically movable within the cylinder. The chamber contains a gas and a liquid, and a sensor assembly is provided for monitoring a condition of a level of the liquid in the chamber. The sensor assembly includes at least one probe within the chamber, and a fitting assembly allows one or more leads from the probe to pass through the wall of the strut while maintaining pressure in the chamber. The fitting assembly includes a plug molded to the one or more leads extending from the probe. The fitting assembly also includes a retainer for holding the plug in sealed relationship with a through passage in the strut. | 12-26-2013 |
20140002811 | Method for Measuring Propagation Loss in a Plane Light Guide Plate | 01-02-2014 |
20140022536 | FAST BRILLOUIN OPTICAL TIME DOMAIN ANALYSIS FOR DYNAMIC SENSING - A method for conducting fast Brillouin optical time domain analysis for dynamic sensing of optical fibers is provided herein. The method includes the following stages: injecting a pump pulse signal into a first end of an optical fiber and a probe signal into a second end of the optical fiber, wherein the probe and the pump pulse signals exhibit a frequency difference between them that is appropriate for an occurrence of a Brillouin effect; alternating the frequency of either the probe or the pulse signals, so as the alternated signal exhibits a series of signal sections, each signal section having a predefined common duration and a different frequency; measuring the Brillouin probe gain for each one of the alternating frequencies; and extracting physical properties of the optical fiber throughout its length at sample points associated with the sampled time and the frequencies, based on the measured Brillouin probe gain. | 01-23-2014 |
20140022537 | COMMUNICATION THROUGH AN ENCLOSURE OF A LINE - A communication system can include a transmitter which transmits a signal, and at least one sensing device which receives the signal, the sensing device including a line contained in an enclosure, and the signal being detected by the line through a material of the enclosure. A sensing system can include at least one sensor which senses a parameter, at least one sensing device which receives an indication of the parameter, the sensing device including a line contained in an enclosure, and a transmitter which transmits the indication of the parameter to the line through a material of the enclosure. Another sensing system can include an object which displaces in a subterranean well. At least one sensing device can receive a signal from the object. The sensing device can include a line contained in an enclosure, and the signal can be detected by the line through a material of the enclosure. | 01-23-2014 |
20140036256 | METHOD FOR DISTINGUISHING OPTICAL FIBER AND METHOD FOR FUSION-SPLICING OPTICAL FIBERS - In an event of fusion-splicing end surfaces | 02-06-2014 |
20140055776 | READ OPTICAL POWER LINK SERVICE FOR LINK HEALTH DIAGNOSTICS - A method is provided for monitoring a state of an optical link in a Fibre Channel infrastructure and includes sending an Extended Link Service (ELS) request to read an optical power of the optical link, and diagnosing a degradation of the optical link, based on a response to the ELS request. | 02-27-2014 |
20140055777 | HIGH-POWERED OPTICAL MODULE SAFETY SYSTEMS AND METHODS - A method, optical module, and optical amplifier are configured to detect fiber discontinuities at or near a port from which high powered optical signals are input into a fiber span. These fiber discontinuities can include fiber pinches, and are detected by monitoring for slight changes in a backscatter signal. Detection is quick and efficient based on the backscatter signal being attenuated by the fiber discontinuities twice, namely once as the high powered optical signals and again as the associated backscatter signal of the high powered optical signals returning to the port. Various remedial actions can be taken upon detecting fiber pinches at or near the port. | 02-27-2014 |
20140071436 | DETERMINING A POLARIZATION-RELATED CHARACTERISTIC OF AN OPTICAL LINK - A polarization-related characteristic of an optical path is determined from a predetermined function of the mean-square of a plurality of differences between polarization-analyzed optical power parameters corresponding to pairs of wavelengths mutually spaced about a midpoint wavelength by a small optical frequency difference. At least some of the said differences correspond to wavelength pairs measured under conditions where at least one of midpoint wavelength, input state of polarization (I-SOP) or analyzed state of polarization (A-SOP) of a pair is different. | 03-13-2014 |
20140085626 | OPTICAL FIBER GRATING TRACKER AND METHOD FOR DETECTING OPTICAL FIBER LINE FAULT - An optical fiber grating tracker includes a first stub, a second stub, an optical fiber grating, and a connection part. The connection part has a through hole. The first stub is inserted into one end of the through hole. The second stub is inserted into the other end of the through hole. An interval exists between the first stub and the second stub. The optical fiber grating is in the through hole and in the interval. A space in the through hole is filled with a waterproof material. The optical fiber grating tracker and the method for detecting an optical fiber line fault can detect an optical fiber fault from an optical fiber truck to the optical fiber grating tracker through an optical splitter, and meanwhile do not affect normal communication of an original optical communication network. | 03-27-2014 |
20140092380 | METHOD OF MEASURING MULTI-MODE FIBER BANDWIDTH THROUGH ACCESSING ONE FIBER END - A method of measuring the bandwidth of a multi-mode optical fiber using single-ended, on-line and off-line approaches and test configurations. The method includes: transmitting a light signal through the first end of a multi-mode fiber toward the second end of the multi-mode fiber, so that a portion of the light signal is reflected by the second end toward the first end of the multi-mode fiber; and receiving the reflected portion of the light signal at the first end of the multi-mode fiber. The method also includes obtaining magnitude and frequency data related to the reflected portion of the light signal at the first end of the multi-mode fiber; and analyzing the magnitude and the frequency data to determine a bandwidth of the multi-mode optical fiber. The length of the multi-mode fiber may also increase over time during testing. | 04-03-2014 |
20140092381 | PORTABLE OPTICAL FIBER TEST SET CONTROLLABLE THROUGH WIRELESS MOBILE DEVICE - A portable optical fiber test set controllable through a wireless mobile device includes: a portable optical fiber tester, which has a communication interface and can test an optical fiber; and a wireless mobile device electrically connected to the communication interface, so that the wireless mobile device can control the portable optical fiber tester to test the optical fiber and can upload test results and data, obtained by the portable optical fiber tester, to a cloud through a wireless network or download data from the cloud. The invention utilizes the portable optical fiber tester, which has the communication interface and works in conjunction with a function of the wireless mobile device connecting to the network whenever network is available, so that the invention becomes the portable optical fiber testing device that can be conveniently carried and used. | 04-03-2014 |
20140098361 | MEASURING MODAL CONTENT OF MULTI-MODED FIBERS - Techniques for analyzing output modal content of optical fibers that support more than one spatial mode are disclosed. These techniques are based on spatially resolving interference between co-propagating modes and constructing a spatial beat pattern between the co-propagating modes. By doing so, these techniques provide information about the modes that propagate along the optical fiber. | 04-10-2014 |
20140098362 | OPTICAL FIBER LINE CHARACTERISTIC ANALYSIS APPARATUS AND ANALYSIS METHOD THEREOF - A test pulse is generated from a first and a second test light beam pulse with different wavelengths, with a predetermined time difference applied between the first and the second test light beam pulse. A circulator inputs the test pulse to a trunk fiber of a measurement target fiber line. A reflected light is extracted which is output from an input end of the trunk fiber. A filter extracts stimulated Brillouin backscattered light. A receiver receives and converts the scattered light into an electrical signal. A processing device carries out the signal to determine in which of N branched fibers the stimulated Brillouin scattered light is generated, while varying a time difference between the first and the second test pulse. | 04-10-2014 |
20140104599 | METHOD OF IMPROVING PERFORMANCE OF OPTICAL TIME DOMAIN REFLECTOMETER (OTDR) - A method of improving the performance of an optical time domain reflectometer (OTDR) is provided. The method according to an embodiment of the present invention can increase accuracy of a distance of the OTDR through an initial calibration method with respect to the refractive index of an optical fiber, and can accurately detect a fault position and accurately analyze a fault cause through a real-time calibration method with respect to the refractive index of the optical fiber when faults and performance degradation occur. | 04-17-2014 |
20140111794 | SYSTEM AND/OR METHOD FOR MEASURING WAVEGUIDE MODES - Subject matter disclosed herein relates to measuring modes of a waveguide. | 04-24-2014 |
20140111795 | SYSTEMS AND METHODS OF PERFORMING REFLECTION AND LOSS ANALYSIS OF OPTICAL-TIME-DOMAIN-REFLECTOMETRY (OTDR) DATA ACQUIRED FOR MONITORING THE STATUS OF PASSIVE OPTICAL NETWORKS - To allow for the characterization of a passive optical network, reflectometry data is closely analyzed to determine reflection events within the data, and to subsequently characterize the reflection events so the status, operating parameters and efficiency of the network can be monitored. The reflectometry data is analyzed using statistical techniques to identify and analyze reflection events, which will ultimately allow meaningful reports to be generated which characterize the operation of the passive optical network. The reports can thus be provided to operators and/or installers to determine the health of the network, and whether any revisions are necessary. | 04-24-2014 |
20140125971 | DEVICE AND METHOD TO MEASURE THE DMD AND OTHER PARAMETERS OF A MULTICORE OPTICAL FIBER - Apparatus and method of simultaneously measuring a parameter of a plurality of cores in at least one optical fiber. An input tester at a first end of the test fiber has a plurality of tester signal inputs with a geometry substantially matching at least a portion of the core geometry of the fiber. At least one test input signal source coupled to the plurality of tester signal inputs. A signal measuring device is alignable at a second end of the fiber to measure the output of the test input signal. The input tester may include a tapered multicore coupler or a laser having a shield with apertures disposable between the laser and the fiber. In the latter case, a lens may be disposed between the shield and the fiber to project light from the laser that passes through the apertures onto the end of the fiber. | 05-08-2014 |
20140139824 | System and Method for Measuring Fiber Temperature Using OTDR Measurements - Systems and methods for calculating a relative temperature of a fiber-optic cable using bi-directional analysis traces with an optical time-domain reflectometer (“OTDR”). Analysis of bi-directional traces along a length of fiber-optic cable yields a scaled local backscatter coefficient of the fiber. Accordingly, an initial set of measurement data is collected at a first time interval and a base scaled local backscatter along a fiber is calculated. A subsequent set of measurement data is collected at a second time interval and a subsequent scaled local backscatter along the fiber is calculated. The exemplary systems and methods described herein determines a change in scaled local backscatter as a function of a difference between the base scaled local backscatter and at least the subsequent scaled local scaled local backscatter along the fiber, and then determines a relative temperature variation of the fiber as a function of the change in scaled local backscatter. | 05-22-2014 |
20140146312 | OPTICAL REFLECTOMETER WITH LOSS AND/OR REFLECTANCE PROFILE VIEW - There is provided an optical reflectometric method and system for characterizing an optical fiber link, wherein events in the fiber optic link under test are identified and values of parameters characterizing the events (e.g. location, insertion loss and reflectance) are extracted from an analysis of one or more reflectometric measurements performed on the optical fiber link. A loss profile and/or a reflectance profile are then constructed. The loss and reflectance profiles are typically displayed on screen or otherwise graphically represented for an operator to be able to appreciate the measurement results at a single glance. | 05-29-2014 |
20140152979 | QUAD OPTICAL TIME DOMAIN REFLECTOMETER (OTDR) - An optical device that includes a first laser source, a multimode coupler optically connected to the first laser source, a first test port optically connected to the multimode coupler, a second laser source, a singlemode coupler optically connected to the second laser source, a second test port optically connected to the singlemode coupler, a photodetector, and a multimode/singlemode combiner optically connected to the multimode coupler, singlemode coupler and photodetector. | 06-05-2014 |
20140160468 | Optical Waveguide Element Evaluation Apparatus and Optical Waveguide Element Evaluation Method - The present invention provides an optical waveguide element evaluation apparatus in which stray light is separated and the distribution of light angles of an optical waveguide element can be evaluated. An optical waveguide element evaluation apparatus includes optical path setting devices that image a near-field pattern at an end face of emission light from an optical waveguide element in the air; a pinhole plate that includes opening portions which the imaged near-field pattern penetrates; and a detection unit that detects the spread angle of the light at the end face of the emission light using a far-field pattern formed of the light penetrating the pinhole plate. | 06-12-2014 |
20140168638 | Measuring Operational Parameters in an ESP Seal with Fiber Optic Sensors - A seal section for use in a wellbore electrical submersible pump and includes an optic fiber detection arrangement wherein one or more optic fiber sensors is used to detect an operational parameter associated with the seal section. The operational parameters can include temperature, vibration and pressure. | 06-19-2014 |
20140176937 | DISTRIBUTED DISTURBANCE SENSING DEVICE AND THE RELATED DEMODULATION METHOD BASED ON POLARIZATION SENSITIVE OPTICAL FREQUENCY DOMAIN REFLECTOMETRY - This invention relates to a distributed disturbance sensing device based on polarization sensitive optical frequency domain reflectometry (OFDR) and the related demodulation thereof. The device, adopting OFDR, polarization controlling and analysis techniques, consists of a ultra-narrow linewidth tunable laser source module, polarization generating and polarization splitting balanced detecting module, laser source optical frequency and phase monitoring module, high-speed optical switch and so on to establish a large-scale and long-distance optical sensing network. The demodulation method consists of analysis the polarization information from sensing optical fiber, the method of suppressing and compensating of the non-linear optical frequency and the laser phase noise, super-resolution analyzing, advanced denoising method and the polarization information analysis method based on Jones and Mueller's matrices using distributed wave plate model of optical fiber. | 06-26-2014 |
20140185037 | METHOD AND APPARATUS FOR DISTURBANCE DETECTION - A sweep sensor may include a signal source, a propagation medium, and a detector. By transmitting an interrogating signal from the signal source into the propagation medium, detectable disturbances along the medium can physically alter the characteristics of the medium, which may cause a measureable change in the backscattered signal at the detector. Based on the change, it may be possible to locate the geographic origins of the physical disturbances along the propagation medium, or to determine the nature of the disturbances, or both. For example, it is generally possible to estimate the approximate distance between the detector and the disturbance given the time required to obtain the backscattered signal and the velocity of the signal source in the propagation medium. Further, in some embodiments, it is possible to quantify the amount of disturbance. | 07-03-2014 |
20140198311 | BI-DIRECTIONAL MULTI-PULSEWIDTH OPTICAL TIME-DOMAIN REFLECTOMETER - There is provided a bi-directional optical reflectometric method for characterizing an optical fiber link. The method comprises: performing a plurality of forward-direction light acquisitions from one end of the optical fiber link and performing a plurality of backward-direction light acquisitions from the opposite end, wherein each light acquisition is performed by propagating at least one test light signal corresponding to given spatial resolution and detecting corresponding return light so as to obtain a reflectometric trace representing backscattered and reflected light as a function of a distance on the optical fiber link, and wherein said plurality of forward-direction light acquisitions and said plurality of backward-direction light acquisitions are each performed with mutually different spatial resolutions; and deriving a value of at least one parameter characterizing an event along said optical fiber link at least using a forward-direction light acquisition and a backward-direction light acquisition performed with mutually different spatial resolutions. | 07-17-2014 |
20140204367 | Method for Designing and Selecting Fiber for Use with a Transmitter Optical Subassembly - A method for compensating for both material or chromatic dispersion and modal dispersion effects in a multimode fiber transmission system is provided. The method includes, but is not limited to measuring a fiber-coupled spatial spectral distribution of the multimode fiber laser transmitter connected with a reference multimode fiber optical cable and determining the amount of chromatic dispersion and modal dispersion present in the reference multimode fiber optic cable. The method also includes, but is not limited to, designing an improved multimode fiber optic cable which compensates for at least a portion of the chromatic dispersion and modal dispersion present in the reference multimode fiber optic cable resulting from the transmitter's fiber-coupled spatial spectral distribution. | 07-24-2014 |
20140204368 | Fibre Optic Distributed Sensor - There is provided a distributed sensor, comprising a length of optic fibre; an interrogator unit having a detector arranged to detect light from the optic fibre, wherein the interrogator is arranged to provide distributed sensing on the optic fibre and wherein an optical path is defined between the optic fibre and the interrogator detector; a sampler coupled to the optic fibre and arranged to obtain a sample of light from the optical path of the optic fibre; a threshold detector arranged to detect the intensity of the sampled light and determine whether the intensity of the sampled light is above a threshold value; and an optical attenuator provided in the optical path and arranged to attenuate light propagating along the optical path when the intensity of the sampled light is above the threshold value. By attenuating light in the optical path if it is above a threshold value, the sensitive detector in the interrogator unit can be protected. | 07-24-2014 |
20140211200 | MULTI-LIGHT FIBER SOURCE FOR FIBER END-SURFACE INSPECTION - A fiber end-surface inspection device and method illuminates the fiber end-surface from at least 2 different illumination angles, taking observations at the different angles, for detection of fiber end-surface imperfections, scratches or the like. | 07-31-2014 |
20140211201 | FIBER FAULT SNIFFER - A fault detector for fiber optic cabling is provided in a hand held device for detecting fiber faults, presence/absence of signal and wavelength of light present on an optical fiber. Audible and visual indicators of the fault/status and wavelength are provided. | 07-31-2014 |
20140211202 | OPTICAL FIBRE SENSOR INTERROGATION SYSTEM - A monitoring system for monitoring a plurality of fibre Bragg gratings in an optical fibre, each fibre Bragg grating being sensitive to a different wavelength of light. The system comprises a broadband source for illuminating the optical fibre; at least one optical interferometer; light feeding means for feeding to an input of the interferometer light reflected from the fibre Bragg gratings, and a processor for processing the output from the interferometer to determine the wavelength of the reflected light. The light feeding means comprise a wavelength division multiplexer operable to separate light received from the optical fibre into a plurality of wavelengths, each associated with one of the fibre Bragg gratings and/or a time division mulitplexer operable to separate light received from the optical fibre into in a time separated series. | 07-31-2014 |
20140218721 | OPTICAL FIBER FAULT LOCATOR - A device includes a memory and a processor coupled to the memory operable to perform operations. The operations include determining a first estimated distance associated with a first location of an optical fiber based on first light detected by a sensor, where the first light is detected at a first time when a portion of the optical fiber has a first configuration, and determining a second estimated distance associated with a second location of the optical fiber based on second light detected by the sensor, where the second light is detected at a second time when the portion of the optical fiber has a second configuration. The operations further include determining a third estimated distance associated with a third location of the optical fiber based on the first estimated distance and the second estimated distance, where the third location is associated with a fault in the optical fiber. | 08-07-2014 |
20140233019 | OPTICAL FIBER MECHANICAL BEND STRESS TEST SYSTEM WITH OPTICAL TIME-DOMAIN REFLECTOMETER - Methods and devices provide for storing historical data that includes interference values mapped to at least one of bend radii values, lifetime values, or failure rate values of optical fibers; transmitting an optical signal, via a test system, toward the optical fiber under test; setting a polarization state of the optical signal before the optical signal propagates through the optical fiber under test; setting a polarization state of a reflected optical signal that has propagated through the optical fiber under test in a manner that causes a minimum interference or a maximum interference; measuring instances of power of the reflected optical signal; and outputting a result that includes at least one of a bend radius value, a lifetime value, or a failure rate that applies to the optical fiber under test based on the measured instances of power and the historical data. | 08-21-2014 |
20140233020 | INTERROGATOR FOR A PLURALITY OF SENSOR FIBER OPTIC GRATINGS - An interrogator for a plurality of sensor fiber optic gratings. The interrogator includes an optical source for providing signals to the plurality of sensor fiber optic gratings. At least one optical filter converts optical signals, returned from the plurality of sensor fiber optic gratings, from (a) changes in peak reflection wavelength to (b) changes in intensity. At least one optical receiver receives the converted optical signals from the at least one optical filter. | 08-21-2014 |
20140268110 | MEASURING BRILLOUIN BACKSCATTER FROM AN OPTICAL FIBRE USING DIGITISATION - A method for measuring Brillouin backscattering from an optical fibre, comprising mixing backscattered light received from the optical fibre and having a Brillouin frequency fβ(t) with coherent light at a frequency f i in an optical detector to produce an electrical signal with a difference frequency ΔF(t)=fβ(t)−f15 and directly digitising the electrical signal using an analog-to-digital converter to generate a sequence of samples representing the electrical signal, the samples then being processed to determine one or more properties of the Brillouin spectral line. The difference frequency may be further reduced by an additional frequency mixing stage to allow digitisation at a lower sampling rate. | 09-18-2014 |
20140268111 | INTEGRATED OPTICS REFLECTOMETER - An apparatus includes a laser source configured to output laser light at a target frequency, and a measurement unit configured to measure a deviation between an actual frequency outputted by the laser source at a current period of time and the target frequency of the laser source. The apparatus includes a feedback control unit configured to, based on the measured deviation between the actual and target frequencies, control the laser source to maintain a constant frequency of laser output from the laser source so that the frequency of laser light transmitted from the laser source is adjusted to the target frequency. The feedback control unit can control the laser source to maintain a linear rate of change in the frequency of its laser light output, and compensate for characteristics of the measurement unit utilized for frequency measurement. A method is provided for performing the feedback control of the laser source. | 09-18-2014 |
20140268112 | COMBINATION VISUAL FAULT LOCATOR SHORT HAUL DISTANCE TEST MEASUREMENT INSTRUMENT FOR OPTICAL FIBERS - A hand-held instrument uses a red laser to both provide a visual indication to the user of where a fault is present along an optical fiber, and a distance measurement to the user where the fault is present along the optical fiber. The instrument provides a single bulkhead to which the optical fiber is attached to accomplish this dual functionality. The instrument passes a beam of red light into the optical fiber. When the red light encounters a fault in the optical fiber, the red light is emitted from the optical fiber so that the user can visually detect the fault. In addition, the red light is reflected back to the instrument and the instrument determines and outputs a distance measurement at which the fault is located. | 09-18-2014 |
20140268113 | SINGLE-FIBER NONCRITICAL-ALIGNMENT WAFER-SCALE OPTICAL TESTING - A method of determining a parameter of a wafer is disclosed. Light is propagated through a waveguide disposed in the wafer. A first measurement of optical power is obtained at a first optical tap coupled to the waveguide and a second measurement of optical power is obtained at a second optical tap coupled to the waveguide using a photodetector placed at a selected location with respect to the wafer. A difference in optical power is determined between the first optical tap and the second optical tap from the first measurement and the second measurement. The parameter of the wafer is determined from the determined difference in optical power. | 09-18-2014 |
20140268114 | APPARATUS FOR SIMULTANEOUSLY INSPECTING AND CLEANING FIBER CONNECTOR - The fiberscope for inspecting and cleaning a fiber connector simultaneously includes a housing with a front panel, a microscope system, a connector holder mounted at a distance from the front panel for receiving a connector ferrule of a fiber connector, and a translation stage for moving the microscope system transversely to align its optical axis with the connector ferrule. The fiberscope further includes a hand knob attached to a fine screw through the connector holder for adjusting the vertical position of the connector ferrule, a mirror pivotally mounted between the connector holder and the front panel, an LED lamp, air nozzles attached to the front panel, and a cleaning air tube for supplying compressed air to the air nozzles. The cleaning air from the air nozzles spray sideways onto the fiber endfaces so that the cleaning air bounces off sideways to avoid secondary contamination. | 09-18-2014 |
20140285795 | DOWNHOLE MULTIPLE CORE OPTICAL SENSING SYSTEM - A downhole optical sensing system can include an optical fiber positioned in the well, the optical fiber including multiple cores, and at least one well parameter being sensed in response to light being transmitted via at least one of the multiple cores in the well. The multiple cores can include a single mode core surrounded by a multiple mode core. A method of sensing at least one well parameter in a subterranean well can include transmitting light via at least one of multiple cores of an optical fiber in the well, the at least one of the multiple cores being optically coupled to a sensor in the well, and/or the at least one of the multiple cores comprising a sensor in the well, and determining the at least one well parameter based on the transmitted light. | 09-25-2014 |
20140307250 | LIGHT COVER OR HOOD FOR LIVE OPTICAL FIBER IDENTIFIER TOOL - A light hood for a fiber identifier tool that includes a head portion having interior photo detectors, a slot for receiving an optical fiber to be tested, and a clamp mechanism for urging the fiber to bend in the vicinity of the photo detectors when the mechanism is operated. The hood has a generally T-shaped body that defines a lower hood portion arranged to engage the clamp mechanism and operate the mechanism when the lower hood portion is pulled downward by a user. An upper hood portion of the body is configured so that when the lower hood portion is engaged with the clamp mechanism and pulled downward, the upper hood portion descends to cover the head portion of the tool including the slot. Outside light is then blocked from entering the slot and reaching the photo detectors whenever a fiber is tested by the tool, thus preventing false indications. | 10-16-2014 |
20140307251 | LIVE OPTICAL FIBER IDENTIFIER TOOL - A live fiber identifier tool includes a head portion having a slot. A cable containing a pair of optical fibers can be inserted in the slot and forced to bend inside the head portion when a trigger is operated. Any light signal in a given fiber partially leaks from the fiber and exits the cable bend. Two photo detectors are located so that one of the detectors receives more light from the cable bend than the other detector depending on the signal direction in the given fiber. Processing components coupled to the detectors and the indicator define a threshold factor that corresponds to a determined difference between the outputs of the detectors. If the difference between the detector outputs does not exceed the threshold factor, an indicator on the tool reports that light signals are traveling in the pair of optical fibers in opposite directions along the cable. | 10-16-2014 |
20140313505 | OPTICAL FIBER HOLE INSERTION DETECTION DEVICE - An optical fiber hole insertion detection device for detecting diameters and lengths of optical fiber hole insertions includes a fixing member, an image capturing unit, a processor, and a display unit. The fixing member fixes the optical fiber hole insertions. The image capturing unit is positioned above the fixing member and is configured to capture a first image and a second image. The first image shows the optical fiber hole insertions along a radial direction, and the second image shows the optical fiber hole insertions along a lengthwise direction. The processor is electrically connected to the image capturing unit and is configured to calculate the diameters and lengths of the optical fiber hole insertions and to analyze whether each optical fiber hole insertion is a qualified product or not according to the diameters and lengths and a predetermined range. The display unit shows the analysis result of the processor. | 10-23-2014 |
20140320850 | Assembly and method for measuring optical power in fiber lasers - A fiber laser system is configured with a power measuring assembly surrounding a splice between two fibers. The power measuring assembly is operative to maintain the splice at a substantially constant splice temperature and shield the spliced fibers from external bending stresses so as to provide for power readings of the laser system at the splice independently from the influence of multiple variable external factors. | 10-30-2014 |
20140347652 | METHOD AND DEVICE FOR DETECTING SYMMETRY OF OPTICAL FIBER - A method for detecting symmetry of optical fibers and a device thereof are provided. The method includes: receiving, by a boundary clock, a first timestamp message carrying a first timestamp via a slave port, and a second timestamp message carrying a second timestamp via a passive port; and determining, by the boundary clock, symmetry of optical fibers according to at least the first timestamp and the second timestamp. The method and device for detecting symmetry of optical fibers provided by the present disclosure reduce the cost of detecting symmetry of optical fibers in the conventional technology, and improve the efficiency of detecting symmetry of optical fibers in the conventional technology. | 11-27-2014 |
20140354977 | FITTING TIP WITH RELAY LENS FOR FIBER-OPTIC CONNECTOR ENDFACE INSPECTOR - A fitting tip of fiber-optic connector endface inspection microscope for inspecting angled connector endfaces includes a relay lens fixed inside its internal channel and is designed such that when it is received in an intended connector adapter and mounted to the inspection microscope, the normal line to the connector endface forms an acute angle γ with the optical axis of the relay lens; the ray exiting from the relay lens and conjugate to the ray along the normal line is aligned with the optical axis of the inspection microscope; and as a result the connector endface is imaged on an imaging plane within the focusing adjustment range of the inspection microscope. The best image of the connector endface is obtained when the angle γ is half of the inclined angle of the angled connector endface. | 12-04-2014 |
20140354978 | METHOD, APPARATUS AND SYSTEM FOR MINIMALLY INTRUSIVE FIBER IDENTIFICATION - A method, apparatus and system for minimally intrusive fiber identification includes imparting a time-varying modulation onto an optical signal propagating in an optical fiber and subsequently detecting the presence of the time-varying modulation in the optical signal transmitting through the fiber to identify the fiber. In a specific embodiment of the invention, a time-varying curvature is imposed on the fiber to be identified and the presence of the resultant time variation in the transmitted power of a propagating optical signal is subsequently detected for identification of the manipulated fiber. | 12-04-2014 |
20140362367 | DISTRIBUTED FIBER BEND AND STRESS MEASUREMENT FOR DETERMINING OPTICAL FIBER RELIABILITY BY MULTI-WAVELENGTH OPTICAL REFLECTOMETRY - The disclosed technology in this patent document includes, among others, methods apparatus for distributed measuring at least one fiber bend or stress related characteristics along an optical path of fiber under test (FUT) uses both a light input unit and a light output unit connected to the FUT at one single end. | 12-11-2014 |
20140368811 | TOMOGRAPHIC IMAGING - Briefly, embodiments of methods and/or systems for tomographic imaging are disclosed. | 12-18-2014 |
20150022803 | FIBER SIGNAL LOSS EVENT IDENTIFICATION - A system includes a wavelength tunable laser to provide a first optical pulse of a first wavelength and a second optical pulse of a second wavelength to an optical fiber, a reflection detector to determine a first fiber attenuation curve from the first reflected pulse and a second fiber attenuation curve from the second reflected pulse, and a discontinuous loss event analyzer to identify a discontinuous loss event at a discontinuous loss point in at least one of the first fiber attenuation curve and the second first fiber attenuation curve, determine a return loss slope based on a return loss at the discontinuous loss point for the first fiber attenuation curve and a return loss at the discontinuous loss point for the second first fiber attenuation curve, and determine whether the discontinuous loss event is a bad fiber bending event based on the return loss slope. | 01-22-2015 |
20150029495 | DIAGNOSTIC MODULE - A diagnostic module may include an inspection device, a cleaning device, and in various other examples, a verification device. The inspection device may inspect an optical fiber end-face of an optical fiber. The cleaning device may clean the optical fiber end-face of the optical fiber. The diagnostic module may automatically move from an optical connector to another optical connector. | 01-29-2015 |
20150062562 | OPTICAL FIBER TESTING USING OTDR INSTRUMENT - A method for testing the operation of an optical fiber cable in a communication network using an optical time domain reflectometer (OTDR) instrument includes receiving a range of identifiers of fiber sets to be tested. Identifiers of a first fiber set are displayed. The first fiber set is included in the range and constitutes a next fiber set to be tested. A determination is made whether the first fiber set is connected to the OTDR instrument. In response to determining that the first fiber set is connected to the OTDR instrument, a test of the first fiber set is performed using the OTDR instrument. Identifiers of a second fiber set are displayed. The second fiber set is included in the range and constitutes a next fiber set to be tested. | 03-05-2015 |
20150062563 | OPTICAL TIME DOMAIN REFLECTOMETER WITH HIGH RESOLUTION AND HIGH SENSITIVITY - An optical time domain reflectometer (OTDR) system with an integrated high speed optical modulator is capable of operating at a speed similar to the OTDR pulse width to improve the measurement resolution and reduce the time required to acquire a high dynamic range OTDR measurement over existing approaches. ASICs can be used to control the modulator and generation of pulses. The high-speed optical modulator enables high resolution single-photon OTDR measurement by blocking out all return light except from the region of fiber under examination. | 03-05-2015 |
20150062564 | TESTING PERFORMANCE OF OPTICAL FIBERS IN THE FIELD - Checking continuity along an optical fiber includes mounting an inspection attachment member to a smart phone; inserting a first end of the optical fiber into a receiving arrangement of the inspection attachment member to align the first end with a light source of the smart phone; activating the light source of the smart phone to shine a light along the optical fiber; and determining whether the light is visible at an opposite end of the optical fiber. Certain types of inspection attachment members also are configured to align an end of an optical fiber with a camera lens of the smart phone. | 03-05-2015 |
20150070688 | SYSTEMS AND METHODS FOR INSPECTING WOUND OPTICAL FIBER - Systems and methods for inspecting wound optical fiber to detect and characterize defects are disclosed. The method includes illuminating the wound optical fiber with light from a light source and capturing a digital image based on measurement light that is redirected by the wound optical fiber to a digital camera. The method also includes processing the digital image with a computer to detect and characterize the defects. The types of defects that can be detected using the systems and methods disclosed herein include bubbles, abrasions, punctures, scratches, surface contamination, winding errors, periodic dimensional errors, aperiodic dimensional errors and dents. | 03-12-2015 |
20150077740 | CABLE WITH OPTICAL FIBER FOR PRESTRESSED CONCRETE - A reinforcing cable for a prestressed concrete structure is disclosed. The cable has an optical fiber entwined between the twisted wire ropes that form the cable. The optical fiber facilitates in situ monitoring of cable integrity by comparing optical signal transmission over time. | 03-19-2015 |
20150098077 | TAG HAVING AN OPTICAL FIBRE SENSOR - A tag for securing to a person or object, comprising at least one fibre optic sensor having a plastics optical fibre that changes optical transmission characteristics with a change in temperature, and a sensor unit coupled to the optical fibre. The sensor unit is configured to detect change in the characteristic of optical transmission. The optical fibre is coupled to a locking strap to extend around a portion of a person or object. A detectable increase in attenuation of light transmitted through the optical fibre may occur when the temperature of the optical fibre is increased from a normal use temperature to at least a threshold temperature, which may be in the vicinity of the softening temperature of the optical fibre. The optical fibre may be used in electronic tags for offender monitoring to ensure the continuity of the strap, and to detect softening and stretching of the optical fibre. | 04-09-2015 |
20150103336 | OPTICAL CONNECTOR MONITORING - There is described an optical connector comprising a casing having a hollow body and at least one aperture at one end thereof, at least one optical fiber having an outer surface and a fiber end and extending inside the hollow body of the casing along a longitudinal direction thereof, a connector assembly supporting the at least one optical fiber in the casing and aligning the fiber end with the at least one aperture, and an optical monitoring device comprising at least one photodetector in proximity to the fiber end of the at least one optical fiber and adapted to detect naturally leaked light from the fiber end. An optical monitoring device and a method for monitoring optical power in an optical connector are also described. | 04-16-2015 |
20150116699 | REMOVABLE DEVICE FOR INSPECTING POLISH OF AN OPTICAL FIBER ENDFACE USING A PORTABLE CAMERA, AND RELATED COMPONENTS, SYSTEMS, AND METHODS - A fiber inspection device is configured to be removably attached to a portable camera, such as a smartphone or other mobile computing device. The device may be arranged to have a slim form factor that complements the form factor of the smartphone or other device. The device may be configured to inspect a polish and/or cleave of the optical fiber. By leveraging the built in camera, computing power and user interface of a smartphone or other mobile computing device, a fiber inspection device can be inexpensively produced for inspecting a polish of an optical fiber endface using mass market camera hardware and software, without the need to develop dedicated electronics hardware or embedded software. | 04-30-2015 |
20150116700 | DEVICE FOR INSPECTING A CLEAVE OF AN OPTICAL FIBER ENDFACE, AND RELATED COMPONENTS, SYSTEMS AND METHODS - A fiber inspection device is configured to inspect a cleave of an optical fiber endface. The device may also be configured to inspect a polish of the optical fiber using the same imaging hardware and/or software. Just as it is important to attain a smooth uniform polish of the optical fiber endface, it is equally important that the initial cleave generate a flat and uniform surface. If an adequate cleave is not attained, signal attenuation may occur, even if the polish of the endface is of otherwise high quality. Thus, by enabling cleave inspection both in the field and lab settings, overall quality control can be increased. | 04-30-2015 |
20150124246 | SYSTEM AND METHOD FOR IDENTIFYING FIBER SEQUENCE IN A MULTI-FIBER OPTICAL CABLE - A system, method and apparatus for identifying fiber sequence in a multi-fiber optical cable are disclosed. The system may include an OTDR device, a receiver, and a launch box. The receiver may comprise a plurality of receiver-fibers differentiated from each other by length. Each receiver-fiber is connected to a fiber of the cable. The launch-box enables the connection of the OTDR device to each of the fibers. A user may connect the output of the OTDR to each of the front ports of a front-connector and collects a trace for each front port. The traces may comprise a marker identifying, by length, the receiver-fiber connected to the fiber. A computer program may be used to compare the traces with each other and to determine a fiber sequence in the tested multi-fiber cable. The determined sequence may be displayed on the OTDR display. | 05-07-2015 |
20150138539 | METHOD OF ESTIMATING A REFLECTION PROFILE OF AN OPTICAL CHANNEL - Proposed is a method of estimating a reflection profile of an optical channel. The method comprises different steps. A measured reflection profile of the optical channel is provided. One or more reflection peaks are estimated within the measured reflection profile. A residual reflection profile is determined, by removing the estimated reflection peaks from the measured reflection profile. Furthermore, a modified residual reflection profile is determined, by modifying one or more estimated crosstalk frequency components within the residual reflection profile. Finally, the estimated reflection profile is determined, by superposing the estimated reflection peaks and the modified residual reflection profile. | 05-21-2015 |
20150146195 | Test Apparatus For Electro-Optical Printed Circuit Boards - A test apparatus for electro-optical printed circuit boards having optical waveguides comprises a control device, a beamer and a camera, which can be positioned in such a way that light emitted by the beamer can be coupled by means of a first deflecting element to optical waveguides of the circuit board and can be coupled out by means of a second deflecting element into the field of vision of the camera. The beamer is used in a first phase to determine the position for each deflecting mirror of the first deflecting element which a light spot needs to assume in the image projected by the beamer so that the light spot illuminates the deflecting mirror. The beamer is used in a second phase to illuminate at least one deflecting mirror and to carry out the testing of the optical waveguide associated with the at least one deflecting mirror. | 05-28-2015 |
20150292956 | DISTRIBUTED TEMPERATURE SENSOR ENHANCEMENT BY STIMULATED RAMAN SUPPRESSION - A distributed temperature sensor and a method of determining temperature are described. The distributed temperature sensor includes an optical fiber to filter or remove Stokes Raman scatter and prevent stimulated Raman scatter and a light source to inject light into the optical fiber. The distributed temperature sensor also includes a photodetector to detect light energy resulting from the light injected into the optical fiber, the light energy including anti-Stokes Raman scatter and Rayleigh scatter; and a processor to determine temperature based on a ratio of the anti-Stokes Raman scatter and the Rayleigh scatter. | 10-15-2015 |
20150292980 | BLOWOUT PREVENTER MONITORING SYSTEM AND METHOD OF USING SAME - A monitoring system for a subsea blowout preventer is provided. The monitoring system includes a fiber optic cable ( | 10-15-2015 |
20150292981 | SHG IMAGING TECHNIQUE FOR ASSESSING HYBRID EO POLYMER/SILICON PHOTONIC INTEGRATED CIRCUITS - Probe beams are scanned with respect to waveguide substrates to generate optical harmonics. Detection of the optical harmonic radiation is used to image waveguide cores, claddings, or other structures such as electrodes. The detected optical radiation can also be used to provide estimates of linear electrooptic coefficients, or ratios of linear electrooptic coefficients. In some cases, the poling of polymer waveguide structures is monitored during fabrication based on a second harmonic of the probe beam. In some examples, third harmonic generation is used for imaging of conductive layers. | 10-15-2015 |
20150300891 | ATTENUATION CORRECTION FOR DISTRIBUTED TEMPERATURE SENSORS USING ANTISTOKES TO RAYLEIGH RATIO - A distributed temperature sensor, a method of determining temperature, and a processing system to compute temperature are described. The sensor includes an optical fiber disposed in an area where temperature is to be measured, a primary light source to inject light into the optical fiber, and a secondary light source to inject light into the optical fiber. The sensor additionally includes a photodetector to detect backscatter light energy from the optical fiber the backscatter light energy including Stokes Raman scatter or anti-Stokes Raman scatter and primary Rayleigh scatter resulting from the primary light source and secondary Rayleigh scatter resulting from the secondary light source, and a processor to determine temperature based on a ratio of the Stokes Raman scatter or the anti-Stokes Raman scatter and a combination of the primary Rayleigh scatter and the secondary Rayleigh scatter. | 10-22-2015 |
20150308897 | METHOD OF ENHANCING CONTRAST IN PRISM COUPLING MEASUREMENTS OF STRESS - A method and apparatus for improving contrast in prism coupling measurements of waveguide mode spectra, wherein the measured waveguide sample has a surface region of rapidly decreasing index, characterized with normalized slope |λ/n dn/dz|>0.0004. An opaque light-blocking element is placed in the portion of the light beam closest to the plane of the contact between prism and measured sample, on the input side, output side or both sides of the prism. The light blocking element prevents light from the light source to reach a portion of the length of the prism-sample coupling interface along the optical path, prevents light reflected from a portion of the aforementioned length to reach the detector, or both when input and output light-blocking elements are used. | 10-29-2015 |
20150308905 | FOREIGN MATTER DETECTION DEVICE - A foreign matter detection device of the present invention is provided with a temperature detection means that detects a temperature distribution in a magnetic field that is formed by a power-supplying device that transmits power wirelessly to a power-receiving device; and a signal processor that, based on a detection result from the temperature detection means, detects a conductive foreign matter in the magnetic field. | 10-29-2015 |
20150308923 | A BRILLOUIN OPTOELECTRONIC MEASUREMENT METHOD - A Brillouin optoelectronic measurement method includes the steps of, providing a pump signal in a first end of an optical fiber to generate Brillouin backscattering, using the generated Brillouin backscattering to perform a measurement, wherein the pump signal includes a front pulse and a rear pulse, wherein the front pulse is modulated. | 10-29-2015 |
20150321682 | LOCATING OF VEHICLES - A method for locating a rail vehicle along a rail route, along which a waveguide is laid. Temporally successive electromagnetic pulses are fed into the waveguide and, for each emitted pulse, at least one back-scattering pattern generated by vehicle-induced back-scattering of the electromagnetic pulse is received and evaluated. The waveguide has at least one locating section along the rail route, in which locating section the vibration sensitivity of the waveguide and/or the vibration acting on the waveguide is greater or less than outside the locating section. The amplitude of the received back-scattering pattern is evaluated and a location signal is generated if the amplitude of the received back-scattering pattern increases or decreases over the course of time. | 11-12-2015 |
20150323418 | A METHOD OF INTERROGATING A MULTIPLE NUMBER OF OPTIC SENSORS, A COMPUTER PROGRAM PRODUCT AND AN INTERROGATING UNIT - The invention relates to a method of interrogating a multiple number of optic sensors. The method comprises the steps of providing a multiple number of optic sensors included in a single optic path and having spectrally separated resonance spectra, and providing a single interrogation unit coupled to the single optic paths. Further, the method comprises the steps of selecting a limited number of interrogation wavelengths for each optic sensor and programming a programmable laser source, included in the single interrogation unit, in a sequence of the selected interrogation wavelengths. In addition, the method comprises the steps of interrogating the optic sensors by operating the laser source in the sequence of the selected interrogation wavelengths, and performing measurements on the programmable laser source output for correcting the interrogating step. | 11-12-2015 |
20150323419 | APPARATUS AND METHOD FOR PARTIAL MONITORING OF OPTICAL FIBER - Provided is an apparatus and a method for partial monitoring of an optical fiber, wherein the optical fiber monitoring apparatus includes a monitoring light transmitter to continuously output a monitoring light to the optical fiber based on a number of measuring time sections generated by dividing an optical fiber monitoring time section, a monitoring light receiver to receive a monitoring light fed back from the optical fiber, measure a monitoring light received based on different measuring time sections for each monitoring light, and store a result of the measuring in a storage medium, and an optical fiber monitor to monitor a status of the optical fiber based on the result of the measuring stored in the storage medium. | 11-12-2015 |
20150323420 | OPTICAL TIME DOMAIN REFLECTOMETER IN A SMALL FORM FACTOR PACKAGE - A system for creating an optical time domain reflectometer (OTDR) in a small package is described. This system allows the implementation of multiple channels of OTDR in package of similar size to existing fiber optic transceivers. | 11-12-2015 |
20150330814 | DISTRIBUTED OPTICAL CHEMICAL SENSOR - The invention relates to a sensor system comprising a waveguide, which waveguide comprises a grating in at least a part of the waveguide, which waveguide further comprises a coating, the coating comprising a polymer, which polymer comprises a chain, in which chain are present an aromatic group and a chemical group selected from the group of sulfonyl groups, carbonyl groups, carbonate groups, fluorocarbon groups, siloxane groups, pyridine groups and amide groups. | 11-19-2015 |
20150330844 | OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASURING DEVICE - An optical fiber temperature distribution measuring device measures a temperature distribution along an optical fiber by using backward Raman scattering light generated in the optical fiber. The device includes an arithmetic controller that changes a plurality of calibration parameters in conjunction with each other on the basis of a measured temperature value and a reference temperature value at a to-be-measured point, thereby converging a calibrated value of the measured temperature to a true value. | 11-19-2015 |
20150338286 | GRATING-BASED SENSOR - An optical fiber-based sensor is described that is suitable for operation in a gas-rich environment. The sensor comprises a chamber into which are mounted one or more segments of optical fiber, into which are inscribed a plurality of sensor gratings. Each of the plurality of sensor gratings is configured to have the same wavelength shift over time in response to a change in gas diffusion, such that gas diffusion parameters are excluded in the determination of the respective amount of change in temperature, applied strain, and gas diffusion. Also described is a fiber, and techniques for making same, comprising of cores extend through a common cladding. The cores are doped so as to create, in conjunction with the cladding, a plurality of waveguides having the same wavelength shift over time is response to a change in gas diffusion, but different wavelength shifts in response to changes in other parameters. | 11-26-2015 |
20150346054 | BI-DIRECTIONAL MULTI-PULSEWIDTH OPTICAL TIME-DOMAIN REFLECTOMETER - There is provided a bi-directional optical reflectometric method for characterizing an optical fiber link. The method comprises: performing at least one forward-direction light acquisition from one end of the optical fiber link and performing at least one backward-direction light acquisition from the opposite end, wherein each light acquisition is performed by propagating at least one test light signal corresponding to given spatial resolution and detecting corresponding return light so as to obtain a reflectometric trace representing backscattered and reflected light as a function of a distance on the optical fiber link, and wherein said forward-direction light acquisition and said backward-direction light acquisition are performed with mutually different spatial resolutions; and deriving a value of at least one parameter characterizing an event at a location along said optical fiber link at least using the forward-direction light acquisition and the backward-direction light acquisition performed with mutually different spatial resolutions. | 12-03-2015 |
20150355040 | ULTRA-SENSITIVE FORCE SENSING BASED ON EVANESCENT LIGHT - Methods, structures, devices and systems are disclosed for implementing a fiber optic force sensing transducer. In one aspect, an exemplary fiber optic force sensing transducer device includes an optical fiber coated by at least one layer of a polyelectrolyte material that utilizes the movement of optical structures coupled to the external polyelectrolyte layer in an evanescent field produced by the optical fiber to detect forces imposing on the fiber. In one aspect, an optical sensing device includes an optical waveguide that internally guides light, one or more layers formed outside the optical waveguide within an evanescent field of the guided light in the optical waveguide, and one or more optical structures coupled to the one or more layers in the evanescent field to emit light based on interaction with the evanescent field to indicate a position of an optical structure relative to an external surface of the optical waveguide. | 12-10-2015 |
20150362404 | METHOD FOR MEASURING LIGHT PHYSICAL CONSTANTS AND DEVICE FOR ESTIMATING LIGHT PHYSICAL CONSTANTS - A light physical constant measurement method includes: virtually dividing an optical transmission medium along a propagation direction to set a plurality of first segments; and estimating light physical constants of the plurality of first segments based on the result of a first propagation simulation that uses a model in which an input optical signal of each of the plurality of intensities propagates sequentially through the plurality of first segments, and in the estimating of light physical constants of the plurality of first segments, the light physical constants of the plurality of first segments are searched for using an evaluation function of evaluating a difference between a measured power spectrum of an output optical signal and a power spectrum of the output optical signal obtained as a result of the first propagation simulation, to estimate the light physical constants of the plurality of first segments. | 12-17-2015 |
20150367386 | SYSTEM AND METHOD OF AN INTEGRATED FIBER OPTIC INSPECTION AND CLEANING APPARATUS - This disclosure concerns a cleaning and inspection system for fiber optics that is rapid, reliable and useful for various types of fiber optics. In an embodiment, the system includes a wide field of view (FOV) camera to image the ferrule and rapidly locate the fiber ends and a narrow FOV camera to provide detailed inspection of individual fiber ends. A cleaning module with a cleaning tip and a cleaning medium that is drawn through the tip is used to clean the fiber ends. Images captured by the dual cameras are automatically enhanced and analyzed to determine the effectiveness of the cleaning process and to identify the types and quantity of defects present. In another embodiment, a single higher resolution camera is provided with a lens that can image an entire fiber array and yet enable defects to be detected by analysis of sub-images of each fiber in the fiber array. | 12-24-2015 |
20150377692 | OFDR SYSTEM FOR LOCALIZED VIBRATION DETECTION - A vibration detector and method of measuring vibration are described. The vibration detector includes an optical fiber comprising a reference reflector and a delay coil, and one or more sensors comprised at respective one or more locations in the optical fiber, each of the one or more sensors including a center reflector and two side reflectors on either side of the center reflector, the delay coil eliminating detection of interference among reflections from the one or more sensors. The vibration detector also includes a light source to introduce light into the optical fiber to interrogate the optical fiber, a detector to obtain interference signals, each of the interference signals being based on interference between reflections from the reference reflector and one of the one or more sensors; and a processor to process each of the interference signals to obtain vibration measurements. | 12-31-2015 |
20150377738 | SYSTEM AND METHOD FOR OPTICALLY READING A SENSOR ARRAY - A system including an optical waveguide having a length extending from an optical interrogator at a first end, a plurality of light-modulating sensor nodes disposed at predetermined locations along the length of the optical waveguide, and (in some embodiments) a plurality of first beam splitters at each of the predetermined locations along the length of the optical waveguide, each of the first beam splitters configured to direct a portion of an optical signal from the optical interrogator to one of the plurality of light-modulating sensor nodes along an optical waveguide path, and return a reflected optical signal to the optical interrogator in an opposite direction along the same optical waveguide path. | 12-31-2015 |
20150377765 | SYSTEMS AND DEVICES FOR SENSING CORROSION AND DEPOSITION FOR OIL AND GAS APPLICATIONS - Sensing systems include a tube defining a Fabry-Perot cavity and an optical fiber including a distal end disposed within the Fabry-Perot cavity and a proximal end. A corrodible material caps the Fabry-Perot cavity. Devices for sensing corrosion of downhole equipment include an optical fiber with a corrodible material disposed over a distal end of the optical fiber. Systems for sensing a condition in equipment include an optical fiber with a fiber Bragg grating proximate a distal end thereof and a mass of sensor material coupled to the distal end of the optical fiber. The mass of sensor material is suspended from above the fiber Bragg grating. Other systems for sensing a condition in a wellbore include an optical fiber and a plurality of fiber Bragg gratings along a length thereof. A plurality of sensor materials are coupled to the optical fiber and surround respective fiber Bragg gratings. | 12-31-2015 |
20160003687 | OPTICAL FIBER TEMPERATURE DISTRIBUTION MEASURING DEVICE - An optical fiber temperature distribution measuring device includes: an optical fiber as a sensor; a calculation control unit for measuring a temperature distribution along the optical fiber based on an intensity ratio between Stokes light and anti-Stokes light of backward Raman scattered light from the optical fiber; and a temperature correction unit for correcting the temperature distribution by using temperature dependence of a loss difference between the Stokes light and the anti-Stokes light. | 01-07-2016 |
20160011018 | TDM- AND WDM-BASED FBG SENSOR ARRAY SYSTEM | 01-14-2016 |
20160011066 | SMALL PROFILE PRESSURE AND TEMPERATURE GAUGES | 01-14-2016 |
20160018277 | SYSTEMS AND METHODS FOR DISTRIBUTED PRESSURE SENSING - A pressure sensing cable in one embodiment includes an optical fiber having a first core and a second core. The first core extends along a length of the cable, and is sized and configured to provide propagation of light along the first core along the length of the cable. The first core has a first mode index corresponding to the speed of light propagation along the first core. The second core extends along the length, is spaced a distance from the first core, and is sized and configured to provide propagation of light along the second core along the length of the cable. The second core has a second mode index corresponding to the speed of light propagation along the second core. The second mode index is different from the first mode index, wherein light propagates along the second core at a different speed than along the first core. | 01-21-2016 |
20160018319 | ENERGY SYSTEM MONITORING - An optical coupler includes at least one input waveguide and a plurality of output waveguides. The optical coupler spatially disperses optical signals carried on the input waveguide according to wavelength to the output waveguides. The input waveguides and the output waveguides are arranged to provide crosstalk between optical signals carried on the output waveguides. | 01-21-2016 |
20160025524 | BRILLOUIN OPTICAL DISTRIBUTED SENSING DEVICE AND METHOD WITH IMPROVED TOLERANCE TO SENSOR FAILURE - A Brillouin optical distributed sensing device and method includes a structure for generating an optical pulsed signal and an optical probe signal. Includes is a circulation component for directing the optical pulsed signal to a sensing optical fiber and for directing an optical measurement signal with Brillouin scattering information arising from the sensing optical fiber toward a detection apparatus. Also included is an optical routing component for configuring the device to allow generating: (i) according to a first configuration, an optical measurement signal with stimulated Brillouin scattering information resulting from the interaction of the optical pulsed signal, and an optical probe signal propagating in the sensing optical fiber in a direction opposite to the optical pulsed signal, or (ii) according to a second configuration, an optical measurement signal with spontaneous Brillouin scattering information resulting from the propagation of the optical pulsed signal in the sensing optical fiber. | 01-28-2016 |
20160033325 | NON-CONTACT METHODS OF MEASURING INSERTION LOSS IN OPTICAL FIBER CONNECTORS - A non-contact method of measuring an insertion loss of a DUT connector is disclosed. The DUT connector has a first ferrule with a first optical fiber and a first end face. The method utilizes a reference connector having a second ferrule with a second optical fiber and a second end face. The method includes: axially aligning the first and second ferrules so that the first and second end faces are confronting and spaced apart to define a gap with an axial gap distance d; measuring values of the insertion loss between the first and second optical fibers for different gap distances d>0; and estimating a value for the insertion loss for a gap distance of d=0 based on the measured values of the insertion loss when d>0. | 02-04-2016 |
20160033359 | Edge Propagating Optical Time Domain Reflectometer And Method Of Using The Same - An OTDR system utilizes a laser source that is turned “on” and kept powered until its light reaches the end of the fiber span being measured (i.e., until the fiber span is fully illuminated). At any point in time after the fiber is fully illuminated, the laser source can be turned “off”. The return (reflected and backscattered) signal is directed into a photodetector of the OTDR, and is measured from the point in time when the fiber span starts to be illuminated. The measurements are made by sampling the return signal at predetermined time intervals—defined as the sampling rate. The created power samples are then subjected to post-processing in the form of a differentiation operation to create a conventional OTDR trace from the collected data. | 02-04-2016 |
20160033360 | MULTI-PEAK REFERENCE GRATING - Methods and apparatus are provided for using a multi-peak reference grating as an optical reference element to produce an optical spectrum with a plurality of reference wavelength peaks spanning a desired wavelength range. This multi-peak reference grating is suitable for use in swept-wavelength interrogation systems, such as those utilizing Bragg grating sensors. Each of the reference wavelength peaks may be characterized for absolute wavelength over a range of environmental operating conditions, such that the absolute wavelength of each reference wavelength peak can be found at any time given the contemporaneous environmental operating condition. This reference grating is interrogated concurrently with the Bragg grating sensors, and the position of each sensor peak relative to the reference grating peaks is used to calculate the absolute wavelength of each sensor (and hence, the corresponding parameter of interest). | 02-04-2016 |
20160041065 | TESTING FIBER ARRANGEMENT IN MULTI-FIBER CABLES - There is provided a method and a system for identifying or verifying the fiber arrangement and/or the cable type of multi-fiber array cables (such as MPO cables) which employs an OTDR acquisition device at the near end of the MPO cable, a loopback device at the far end and an array of signatures detectable by the OTDR, either at the far or the near end. The loopback device allows performing bidirectional OTDR measurements with a single OTDR acquisition device (without moving it from one end to the other) and the signature array provides fiber arrangement/cable type identification or verification. | 02-11-2016 |
20160047713 | Zeroing Method And Zeroing Device For Optical Time-Domain Reflectometer - A zeroing method and zeroing device for an optical time-domain reflectometer (OTDR) are disclosed. The zeroing method includes: before starting the optical time-domain reflectometer, when a laser device is in an off state, sending a zeroing signal; and performing zeroing processing according to the zeroing signal. In the embodiments of the present invention, the feedback zeroing can be performed on a receiving circuit by utilizing the idle time prior to a test or during the test, thus the influence of an offset voltage is reduced, and a problem of operational-amplifier zero drift also can be solved in the meantime, which improves a detectability of the OTDR, and overcomes a disadvantage that a manual zeroing method is not intelligent and a measured waveform introduced in an automatic zeroing method is bad. | 02-18-2016 |
20160061690 | NON-CONTACT METHOD OF MEASURING INSERTION LOSS IN OPTICAL FIBER CONNECTORS USING ACTIVE ALIGNMENT - A non-contact method of measuring an insertion loss of a device-under-test (DUT) connector is disclosed. The method includes arranging the DUT connector and a reference connector so that their respective ferrule ends are confronting and spaced apart. The method also includes moving the reference and DUT connectors closer together while measuring the insertion loss and while also actively maintaining alignment of the first and second ferrules using a position measurement system. The insertion loss for the DUT connector is obtained by estimating a value for the insertion loss at a position where the end faces of the reference and connector ferrules would come into contact. | 03-03-2016 |
20160069774 | OPTICAL PULSE TESTER - An optical pulse tester includes: an OTDR measurer configured to execute an OTDR function of measuring a time distribution of a power of return light of an optical pulse input to an optical fiber; a display configured to display an OTDR measurement screen indicating information on execution of the OTDR function; and a controller configured to control the OTDR measurer and the display. The controller displays, on the OTDR measurement screen, a menu for allowing an operating person to call an auxiliary function for measurement of the optical fiber, and displays, on the OTDR measurement screen, a sub-screen indicating information on execution of the auxiliary function called by the operating person. | 03-10-2016 |
20160072576 | LIVE MONITORING OF RAMAN AND FIBER DEGRADATION IN DWDM NETWORKS USING IN-SERVICE OTDR - A method of analysing performance of an optical fiber link. As a preliminary step, a reference trace indicative of a distributed optical performance of the optical fiber link is derived. During in-service operation of the optical fiber link, an Optical Time Domain Reflectometry (OTDR) sub-system measures an OTDR trace with Raman amplification ON, and a real-time cumulative Raman Gain profile of the optical fiber link is calculated based on the reference trace and the measured OTDR trace. | 03-10-2016 |
20160076969 | OPTICAL FIBER FAULT LOCATOR - A device includes a processor, a light emitter coupled to the processor, and a memory. The light emitter is configured to generate a first light to be provided to an optical fiber at a first time when a portion of the optical fiber has a first physical configuration and to generate a second light to be provided to the optical fiber at a second time when the portion of the optical fiber has a second physical configuration. The memory stores instructions executable by the processor to determine a first estimated distance associated with a first location of the optical fiber based on the first light, determine a second estimated distance associated with a second location of the optical fiber based on the second light, determine a third estimated distance associated with a third location of the optical fiber based on the first estimated distance and the second estimated distance. | 03-17-2016 |
20160091392 | CONTROLLED-CONTACT METHOD OF MEASURING INSERTION LOSS IN OPTICAL FIBER CONNECTORS - A controlled-contact method of measuring an insertion loss of a compressible DUT having a first ferrule with a first optical fiber and a first end face is disclosed. The method utilizes a compressible reference connector having a second ferrule with a second optical fiber and a second end face. The method includes: axially aligning the first and second ferrules to define a gap with an axial gap distance of greater than 150 μm; moving the reference connector at a connector velocity in the range from 1 mm/s to 5 mm/s; when the gap distance is less than 150 μm, reducing the connector velocity to between 10 μm/s and 500 μm/s until contact while continuing to measure the coupled optical power; after contact, increasing the connector velocity as the reference and DUT connector axially compress. The insertion loss is determined from ongoing measurements of the coupled optical power. | 03-31-2016 |
20160091465 | VIBRATION MONITORING SYSTEM AND METHOD - Methods and systems for monitoring vibrations introduce baseline vibrations into a fiber optic cable with one or more of a designated frequency or a designated amplitude. Changes in the baseline vibrations are monitored using the fiber optic cable. Information about environmental conditions outside of the fiber optic cable and/or moving objects can be determined based at least in part on the changes in the baseline vibrations that are monitored. The information that is determined about the objects, such as vehicles, can be modified based on the changes in the baseline vibrations. | 03-31-2016 |
20160109327 | METHOD AND OTDR APPARATUS FOR OPTICAL CABLE DEFECT LOCATION WITH REDUCED MEMORY REQUIREMENT - Optical time domain reflectometer (OTDR) systems, methods and integrated circuits are presented for locating defects in an optical cable or other optical cable, in which a first optical signal is transmitted to the cable and reflections are sampled over a first time range at a first sample rate to identify one or more suspected defect locations, and a second optical signal is transmitted and corresponding reflections are sampled over a second smaller time range at a higher second sample rate to identify at least one defect location of the optical cable for relaxed memory requirements in the OTDR system. | 04-21-2016 |
20160109667 | METHODS FOR DETERMINING RECEIVER COUPLING EFFICIENCY, LINK MARGIN, AND LINK TOPOLOGY IN ACTIVE OPTICAL CABLES - A method for determining receiver coupling efficiency includes varying optical power inputted into a half active optical cable to determine a maximum optical power at which the TIA squelches and determining a receiver coupling efficiency by calculating a ratio of a threshold optical power to the maximum optical power at which the TIA squelches. A method of determining link loss in a channel includes varying optical power of a light source to determine the maximum optical power at which the TIA squelches and determining the link loss in the channel by subtracting the maximum optical power from the threshold optical power. A method of determining link topology includes selecting a pattern of optical powers and matching a pattern of squelched and non-squelched outputs with the pattern of optical power. An active optical cable includes memory storing a value related to an initial link loss of the active optical cable. | 04-21-2016 |
20160116369 | ARRAYED WAVE DIVISION MULTIPLEX TO EXTEND RANGE OF IOFDR FIBER BRAGG SENSING SYSTEM - An apparatus for performing a measurement of a downhole property includes an optical fiber having a first section that has a first set of fiber Bragg gratings with a first resonant wavelength inscribed therein and a second section that has a second set of fiber Bragg gratings with a second resonant wavelength different from the first resonant wavelength inscribed therein. The second section is in series with the first section. An optical interrogator emits a swept-wavelength frequency domain light signal having varying wavelength amplitude modulation into the optical fiber, receives a frequency domain return light signal, and transforms the frequency domain return signal into a time domain to determine a resonant wavelength shift of each fiber Bragg grating and the corresponding location of each interrogated fiber Bragg grating. A processor converts the resonant wavelength shift of each interrogated fiber Bragg grating into the downhole property measurement. | 04-28-2016 |
20160116370 | METHOD, APPARATUS AND SYSTEM FOR MINIMALLY INTRUSIVE FIBER IDENTIFICATION - A method, apparatus and system for minimally intrusive fiber identification includes imparting a time-varying modulation onto an optical signal propagating in an optical fiber and subsequently detecting the presence of the time-varying modulation in the optical signal transmitting through the fiber to identify the fiber. In a specific embodiment of the invention, a time-varying curvature is imposed on the fiber to be identified and the presence of the resultant time variation in the transmitted power of a propagating optical signal is subsequently detected for identification of the manipulated fiber. | 04-28-2016 |
20160123837 | DEVICES AND METHODS FOR CHARACTERIZATION OF DISTRIBUTED FIBER BEND AND STRESS - The disclosed technology includes, among others, methods and devices for measuring distributed fiber bend or stress related characteristics along an optical path of fiber under test (FUT) uses both a light input unit and a light output unit connected to the FUT at one single end. | 05-05-2016 |
20160123873 | HIGH PRECISION MEASUREMENT OF REFRACTIVE INDEX PROFILE OF CYLINDRICAL GLASS BODIES - According to some embodiments a method of measuring the refractive index profile of a consolidated glass body having a cylindrical surface comprises the steps of: (a) forming an image of a slit behind the glass body, (b) optionally pre-scanning the cylindrical surface of the test glass body or a reference glass body and analyzing the data within a fixed window to determine the likely location of the zero-order, un-diffracted beam while ignoring other diffracted beams; (c) optionally adjusting the optical power to improve the intensity of the data within the fixed window in order to improve the analysis; (d) predicting the trajectory of the zero-order beam through the preform based on the sampling location x | 05-05-2016 |
20160139196 | Fiber Aligned and Motionally Coupled with Electric Cable - An arrangement comprising an electric cable, at least one fiber at least a part of which being aligned along and motionally, in particular vibrationally, coupled with the electric cable, and a device for detecting effects in the electric cable via said at least one fiber. | 05-19-2016 |
20160139353 | TRACEABLE OPTICAL FIBER CABLE AND FILTERED VIEWING DEVICE FOR ENHANCED TRACEABILITY - A system and method for tracing an optical communication cable and related traceable fiber optic cable are provided. The system includes a traceable optical communication cable that includes an elongate light emitting element extending along at least a portion of the length of the cable body configured to emit light radially outward from the cable body, and the light emitted from the light emitting element has a wavelength range. The cable body includes a plurality of spaced light transmitting windows separated from each other by a plurality of opaque fire-resistant sections. The system includes a viewing device having a light filtering element configured to pass light within the wavelength length range through the light filtering element and to block at least a portion of light having wavelengths outside of the wavelength range. | 05-19-2016 |
20160146699 | METHODS AND APPARATUS SEGMENTED CALIBRATION OF A SENSING OPTICAL FIBER - Optical frequency domain reflectometry (OFDR) circuitry to perform tasks on an optical fiber to generate calibration or correction data for calibrating or correcting a reference OFDR data set. A segmented technique is used which permits precise and accurate determination of the correction data for even initial and long fiber lengths. Correction information for each segment is stitched together to generate the correction data for the fiber. | 05-26-2016 |
20160153864 | INTEGRATED OPTICS REFLECTOMETER | 06-02-2016 |
20160161363 | DISTRIBUTED SENSING OPTICAL FIBER MULTI-OBJECTIVE MULTI-DEGREE-OF-FREEDOM STATIC AND DYNAMIC TEST DEVICE AND METHOD - The present invention relates to a distributed sensing optical fiber performance multi-objective multi-degree-of-freedom static and dynamic test integrated platform and a test method. Wherein an optical fiber multi-degree-of-freedom fixing system is sequentially connected with an artificial loading and unloading device and an oil pressure control loading and unloading device, and an optical fiber under test is connected with the optical fiber multi-degree-of-freedom fixing system and a distributed optical fiber Brillouin frequency shift acquisition system; and test on performance of optical fiber is achieved by controlling devices in the optical fiber multi-degree-of-freedom fixing system. The device of the present invention has a large number of advantages such as a simple structure, a low cost, convenient operation, less disturbance, many test classes, strong adaptability, stable performance and convenient loading and unloading. | 06-09-2016 |
20160161366 | QUAD OPTICAL TIME DOMAIN REFLECTOMETER (OTDR) - An optical device that includes a first laser source, a multimode coupler optically connected to the first laser source, a first test port optically connected to the multimode coupler, a second laser source, a singlemode coupler optically connected to the second laser source, a second test port optically connected to the singlemode coupler, a photodetector, and a multimode/singlemode combiner optically connected to the multimode coupler, singlemode coupler and photodetector. | 06-09-2016 |
20160161397 | DETERMINING A POLARIZATION-RELATED CHARACTERISTIC OF AN OPTICAL LINK - A polarization-related characteristic of an optical path is determined from a predetermined function of the mean-square of a plurality of differences between polarization-analyzed optical power parameters corresponding to pairs of wavelengths mutually spaced about a midpoint wavelength by a small optical frequency difference. At least some of the said differences correspond to wavelength pairs measured under conditions where at least one of midpoint wavelength, input state of polarization (I-SOP) or analyzed state of polarization (A-SOP) of a pair is different. | 06-09-2016 |
20160169807 | OPTICAL FIBER CORD AND ABNORMALITY DETECTION SYSTEM | 06-16-2016 |
20160170151 | FIBER INSPECTION MICROSCOPE AND POWER MEASUREMENT SYSTEM, FIBER INSPECTION TIP AND METHOD USING SAME | 06-16-2016 |
20160178349 | METHOD TO IMPROVE FIBER LENGTH MEASUREMENT USING CONFOCAL LASER SCANNING MICROSCOPE IMAGES | 06-23-2016 |
20160178357 | System and Method for Reconstructing a Trajectory of an Optical Fiber | 06-23-2016 |
20160187223 | NOISE MANAGEMENT FOR OPTICAL TIME DELAY INTERFEROMETRY - An integrated fiber interferometry interrogator for generating superimposed waves is disclosed. The system is optimized for efficiency and vibration attenuation. The system comprises an optical light source for generating a first signal, a first signal splitter which splits the first signal into a reference signal and an interrogation signal, optical modulators for modulating the signals, a fiber coupler connected to a fiber under test, an isolator, a circulator with a plurality of connections for directing the signals, a signal mixer for mixing the signals into superimposed waves, and photo diodes for receiving the superimposed waves. | 06-30-2016 |
20160187224 | OTDR SIGNAL INJECTION FOR MULTI-BAND OPTICAL POWER BALANCING - A system includes an Optical Time Domain Reflectometer (OTDR) that injects a first OTDR signal at a first optical wavelength, a first power level and a first polarization state into an optical fiber. The system further includes an OTDR monitor that monitors multi-band optical signals on the optical fiber, selects a second power level and a second polarization state based on the monitoring of the multi-band optical signals, and determines parameters associated with the optical fiber based on the monitoring. The OTDR injects a second OTDR signal at the first optical wavelength, the selected second power level and the selected second polarization state into the optical fiber. The system operates to allow un-balanced power levels across multiple wavelength bands to be balanced due to inter-channel Raman power shift. | 06-30-2016 |
20160187608 | OPTICAL FIBER THAT PROVIDES AN INDICATION THAT BREAKAGE IS IMMINENT, AND METHOD OF MANUFACTURING SUCH AS FIBER - An optical fiber includes an integrated detector in the form of phosphors that emit light of a characteristic frequency or wavelength in response to leakage, through the fiber cladding, of light having an interrogation wavelength λ | 06-30-2016 |
20160202142 | DISTRIBUTED MULTI-CHANNEL COHERENT OPTICAL FIBER SENSING SYSTEM | 07-14-2016 |
20160377812 | INTEGRATED SILICON-ON-INSULATOR BENT TAPER AND POLARIZATION ROTATOR - A SOI bent taper structure is used as a mode convertor. By tuning the widths of the bent taper and the bend angles, almost lossless mode conversion is realized between TE0 and TE1 in a silicon waveguide. The simulated loss is <0.05 dB across C-band. This bent taper can be combined with bi-layer TM0-TE1 rotator to reach very high efficient TM0-TE0 polarization rotator. An ultra-compact (9 μm) bi-layer TM0-TE1 taper based on particle swarm optimization is demonstrated. The entire TM0-TE0 rotator has a loss <0.25 dB and polarization extinction ratio >25 dB, worst-case across the C-band. | 12-29-2016 |
20170234767 | TESTING FIBER ARRANGEMENT IN MULTI-FIBER CABLES | 08-17-2017 |
20170234768 | METHOD AND OTDR APPARATUS FOR OPTICAL CABLE DEFECT LOCATION WITH REDUCED MEMORY REQUIREMENT | 08-17-2017 |
20170234769 | METHODS AND APPARATUS FOR DETERMINING GEOMETRIC PROPERTIES OF OPTICAL FIBER PREFORMS | 08-17-2017 |