Entries |
Document | Title | Date |
20080205883 | Device For Measuring the Profile of Very Short Single Pulses - The invention relates to a device for measuring the profile of single optical pulses, comprising: | 08-28-2008 |
20080205884 | Polarization Controlled Interferometric Chirp Characterization - The invention relates to determining a chirp property) of an optical device, comprising: receiving an input optical signal from the optical device and generating an output optical signal by providing a change of a state of polarization by means of a polarization controller operating at a first setting and an interferometric superposition of two signal parts in any order, determining an optical intensity of the output optical signal, controlling the polarization controller to operate at a second setting in order to provide a different change of the state of polarization and repeating previous steps for determining a corresponding optical intensity, and determining the chirp property by evaluating the optical intensities determined in response to the different polarization controller settings. | 08-28-2008 |
20080219660 | Communicating Information - The present invention relates to the communication of information where the information is introduced at a plurality of spaced apart locations onto an optical waveguide. The following steps are performed: (i) transmitting test signals onto the waveguide, components of the test signals being returned in a distributed manner along the waveguide; (ii) receiving first component signals returned from beyond a first location at which information is introduced; (iii) receiving second component signals returned from beyond a second location at which information is introduced, the second component signals being returned through the first location; and, (iv) processing the second component signals using the first component signals to distinguish information introduced at the second location from information introduced at the first location. | 09-11-2008 |
20080226289 | Optical device testing - In one embodiment, an apparatus comprises a pattern generator to generate a test bit pattern in an electrical signal, an optical transponder to covert the electrical signal to an optical signal, transmit the optical signal to a device, and receive a processed test bit pattern from the device, and an error detector to analyze the processed test bit pattern to determine an error rate associated with the device. | 09-18-2008 |
20080298800 | TRANSMISSION DEVICE AND ROUTE VERIFYING METHOD - A transmission device transmitting a data frame to an opposite transmission device by use of one virtual transmission path built up by a plurality of communication channels comprises a route control unit determining each of routes of the communication channels building up the virtual transmission path between the transmission device and the opposite transmission device, a circuit setup unit performing a circuit setup of the self-device based on the routes determined by the route control unit, and a test signal transmitting unit transmitting test signals to the opposite transmission device via the communication channels based on the circuit setup. | 12-04-2008 |
20090028549 | System and Method for Suppressing Beat Noise in Line Monitoring Equipment - A system and method for suppressing beat noise in line monitoring equipment. A wavelength dither generator wavelength modulates a carrier wavelength of a test signal laser transmitter. A test code is modulated on the dithered carrier wavelength to provide a test signal output of the line monitoring equipment. | 01-29-2009 |
20090028550 | System and Method Using Differential Loop Gain for Fault Identification in Line Monitoring Equipment - A system and method using differential loop gain for fault analysis in line monitoring equipment. Differential loop gain data is calculated from loop gain data, and fault analysis is conducted using differential loop gain data, e.g. by comparing the differential loop gain data to predefined fault signatures. | 01-29-2009 |
20090047013 | In-Band Optical Frequency Division Reflectometry - An apparatus comprising an optical transmitter coupled to an optical fiber, and an optical receiver coupled to the optical fiber, wherein the transmitter is configured to transmit a test signal data pattern and user data into the optical fiber, and wherein the receiver is configured to receive a reflection of the test signal data pattern. Also disclosed is a network component comprising a processor configured to implement a method comprising promoting the transmission of an optical test signal data pattern into an optical fiber, wherein the test signal data pattern creates a radio frequency (RF) tone, and detecting a reflection of the RF tone in the optical fiber. | 02-19-2009 |
20090060495 | INITIATING DIAGNOSTICS FROM ANY USER COMMUNICATION TERMINAL - A method for initiating diagnostic operations for a communication network, and devices, a network, and computer-readable storage medium storing control logic, that operate in accordance with the method. A test set device is communicatively coupled to a test head. The test set device provides access information to the test head, the access information comprising a diagnostic code indicating a diagnostic operation to be performed. The test head is communicatively coupled to a network. The test head provides the diagnostic code to the network device and sends a response from the network device to the test set device, the response indicating a result of performing the diagnostic operation. In this manner, a field technician can initiate diagnostics without the intervention of another technician, thereby reducing manpower required to troubleshoot a problem and improve troubleshooting turnaround. | 03-05-2009 |
20090080881 | OPTICAL COMMUNICATION METHOD, OPTICAL COMMUNICATION DEVICE, AND OPTICAL COMMUNICATION SYSTEM - The present invention relates to controlling wavelength switching in a plurality of nodes that are provided to increase the distance of signal transmission in inverse MUX transmission in which a high-speed line is divided into a plurality of low-speed lines for transmission. A maximum skew occurring between adjacent nodes is measured, and switching of wavelength channels is performed in one or a plurality of nodes on the basis of the measured maximum skew to keep the skew of the entire inverse MUX transmission system at or below a prescribed value. The optical communication device is provided with an NNI functional block to which high-speed lines on the transmission channel side are connected, and a UNI functional block to which low-speed lines on the client side are connected. | 03-26-2009 |
20090097843 | Optical Phase Modulator With Monitoring Structure - The invention relates to an optical waveguide device that includes a waveguide phase modulator (WPM). A waveguide monitoring structure is coupled optically in parallel with the WPM so as to form a Mach-Zehnder interferometer therewith for producing monitor light indicative of a phase shift imparted by the WPM. The waveguide monitoring structure includes a first optical tap for tapping off a fraction of light entering the first WPM for providing first tapped-off light, a second optical tap for tapping off a fraction of light exiting the first WPM for providing second tapped off light, and an ancillary phase modulator for modulating the optical phase of the first or second tapped-off light so as to modulate the intensity of the monitor light in dependence upon the first phase shift. A feedback circuit controls the phase shift imparted by the WPM based on a modulation index of the monitor light. | 04-16-2009 |
20090097844 | SENSING A DISTURBANCE - The present invention relates to a method of sensing a disturbance along an optical link including the steps of: using a first interferometer arrangement connected to an optical source so as to generate pairs of signal copies, which signal copies of a given pair are temporally delayed relative to one another; transmitting the time-displaced signal copies from the first interferometer arrangement onto the optical link; receiving the time-displaced signal copies transmitted over the optical link; and, using a second interferometer arrangement to temporally recombine the received signal copies from a given pair so as to generate an interferometer signal, which interferometer signal is representative of environmental effects on the optical link. | 04-16-2009 |
20090110390 | Multimode Fiber Link Probe - A link probe for multimode fibers in optical networks is provided. An optical test probe signal is sent over a multimode fiber of an optical network link and a receiver converts the optical signal into an electronic signal with a trigger generated by the clock recovery section of an EDC (electronic dispersion compensation) unit. The digital signal is processed by a modified IEEE algorithm to determine a TWDP (Transmitter and Waveform Dispersion Penalty) parameter which quantifies the transmission quality of the multimode fiber and link suitability to LRM transmission. | 04-30-2009 |
20090123147 | Test Instrument For Testing Multi-Wavelength Optical Networks Using Two Or More Tunable Lasers - The present invention relates to test equipment (e.g. TBERD 8000) with two or more Tunable Lasers (TL) for testing the complete spectrum of a DWDM system. Diagnostic software is used to stepwise tune a TL to a specific wavelength under test and simultaneously insert one or more distortion wavelengths while executing bit error and impairment tests on the wavelength under test. Information from these tests is correlated to create a combined DWDM network test report. | 05-14-2009 |
20090169202 | Link Discovery and Verification Using Loss of Light - Systems and methods for link discovery and verification that minimize the need for line termination resources to generate and interpret packets. According to one aspect of the present invention, a method for operating a first node in a data communication network to verify connectivity to a second node includes sending a request for verification of connectivity to the second node that identifies an IP address of the first node, a port of the first node, and an IP address of the second node. The method also includes toggling a signal emitted by the port, and notifying the second node of a toggling mode of the port. Finally, the method includes receiving a first message from the second node indicating whether the second node detected the toggling. The request for verification of connectivity is sent on a control channel via a control message separate from the signal and the first message. | 07-02-2009 |
20090196600 | OPTICAL TRANSMISSION MODULE - Provided is an optical transmission module that includes: a semiconductor light emitting element for emitting laser light; a first driving unit for providing a first driving current to the semiconductor light emitting element; a switching unit connected between the semiconductor light emitting element and the first driving unit; and a package for accommodating the semiconductor light emitting element, the first driving unit, and the switching unit. The switching unit includes a first input for receiving a first driving current outputted from at least from the first driving unit, a second input for receiving a second driving current for testing the semiconductor light emitting element, and an output connected to the semiconductor light emitting element. The switching unit connects the first input or the second input to the output. | 08-06-2009 |
20090208202 | METHOD AND DEVICE FOR COMPLEX ANALYSIS OF OPTICAL SPECTRUMS - This invention relates to a device and associated process capable of obtaining the optical spectrum phase of an optical signal or test signal to be analyzed using techniques for heterodyning between two monochromatic spectral components simultaneously extracted from the test signal itself by means of stimulated Brillouin scattering. | 08-20-2009 |
20090208203 | METHODS OF RESTORATION IN AN ULTRA-LONG HAUL OPTICAL NETWORK - A method includes receiving a restoration indicator associated with a path that includes an optical cross-connect (OXC). The OXC is reconfigured from a standby configuration to a restoration configuration in response to the restoration indicator. An optical signal received in a first direction at a first wavelength is optically regenerated to produce an optical signal in the first direction at a second wavelength. An optical signal received in a second direction at the second wavelength is optically regenerated to produce an optical signal in the second direction at the first wavelength. | 08-20-2009 |
20090238557 | Self-Calibrating Integrated Photonic Circuit and Method of Control Thereof - A self-calibrating integrated photonic circuit and a method of controlling the same. In one embodiment, the circuit includes: (1) a substrate, (2) a laser located on the substrate and configured to produce source light at an output frequency, (3) a laser alignment sensor located on the substrate and including: (3a) a reference optical resonator configured to receive the source light, have a null proximate a predetermined center frequency and provide output light as a function of a relationship between the output frequency and the center frequency and (3b) a photodetector configured to provide an electrical signal of a magnitude that is based on the output light and (4) a calibration controller located on the substrate, coupled to the photodetector and configured to adjust the output frequency based on the magnitude. | 09-24-2009 |
20090238558 | STATION TERMINAL DEVICE, COMMUNICATION SYSTEM, SUBSCRIBER DEVICE MANAGEMENT METHOD, AND RECORDING MEDIUM RECORDING PROGRAM FOR STATION TERMINAL DEVICE - In a conventional art, ONUs in services are significantly affected even when just one ONU is activated, and thus a communication bandwidth fails to be effectively utilized. To address this, an OLT includes a first distance information storing unit that stores information on the distance to an ONU in association with identification information which identifies the ONU (ONUi), and by using the distance information stored in the first distance information storing unit, an activation control unit controls activation of the ONUi. | 09-24-2009 |
20090252491 | SENSING A DISTURBANCE - The present invention relates to a system for sensing of a disturbance on an optical link. Data traffic from an optical source with a short coherence length is transmitted along the link to a receiver station on one or more of a plurality of time-division-multiplexed channels. One of the channels is used to transmit encoded phase information relating to the phase characteristics of the optical source output. At the receiver station the actual phase characteristics of the arriving light from the optical source is compared with the encoded phase information. Since a physical disturbance of the link is likely to alter the actual phase characteristics of the arriving light but not the encoded phase information, it is possible to determine if a physical disturbance has occurred. The system can conveniently be used to monitor an optical link carrying communications traffic. | 10-08-2009 |
20090263123 | FIBER NETWORK MONITORING - This specification describes technologies relating to optical fiber network monitoring. A monitoring system is provided. The monitoring system includes a fiber network including a plurality of branch fibers and a main station coupled to a main fiber of the fiber network to broadcast communications signals to a plurality of branch stations. The monitoring system includes a monitoring device configured to transmit a monitoring signal and detect reflected portions of the monitoring signal such that the received portions specifically identify a condition of specific branch fibers of the plurality of branch fibers and a plurality of filtering devices coupled to each respective branch fiber, each filtering device including a transmission window configured to pass a plurality of communication wavelengths and a distinct wavelength of the monitoring signal, where the distinct wavelength is not within the transmission window, and block the remaining wavelengths, where the distinct wavelength identifies the respective branch fiber. | 10-22-2009 |
20090290868 | METHOD, APPARATUS, AND SYSTEM FOR TRANSMITTING TEST DATA - A method for transmitting test data includes: an optical network unit (ONU) determining whether its current situation satisfies a preset condition, and if so, the ONU transmitting its test data to an optical line terminal (OLT). A method for acquiring a test data, an ONU, an OLT, and a passive optical network (PON) system are also provided. According to the method for transmitting test data, the method for acquiring test data, the ONU, the OLT, and the PON system provided by the present invention, the ONU may transmit its test data in real time, and the OLT may also obtain the ONU test data in real time, which helps to the real-time monitoring on the network status of the PON. | 11-26-2009 |
20090297140 | MEASURING CHROMATIC DISPERSION IN AN OPTICAL WAVELENGTH CHANNEL OF AN OPTICAL FIBER LINK - Two intensity modulated test signals are generated with precise frequency offset from a single laser source, and multiplexed into a combined test signal. The two modulated signals are demultiplexed at a receiver using a fixed periodic optical filter with complementary output ports. Group velocity dispersion/chromatic dispersion is measured over a large dynamic range, using pseudo-random intensity modulation and digital demodulation techniques. | 12-03-2009 |
20090304379 | OPTICAL SIGNAL BIT RATE ADJUSTER, AN OPTICAL SIGNAL GENERATOR, AN OPTICAL TEST DEVICE, AN OPTICAL SIGNAL BIT RATE ADJUSTMENT METHOD, A PROGRAM, AND A RECORDING MEDIUM - An optical signal bit rate adjustment device of the present invention includes a demultiplexing unit that demultiplexes light into first demultiplexed light and second demultiplexed light, a first optical path through which the first demultiplexed light passes, a second optical path through which the second demultiplexed light passes, a multiplexing unit that multiplexes the first demultiplexed light having passed the first optical path and the second demultiplexed light having passed the second optical path, multiple first period changing units that are disposed along the first optical path, and change a period for which the first demultiplexed light passes through the first optical path according to first electric pulse signals to be fed, and multiple second period changing units that are disposed along the second optical path, and change a period for which the second demultiplexed light passes through the second optical path according to second electric pulse signals to be fed, where the first electric pulse signals and the second electric pulse signals are displaced in timing. | 12-10-2009 |
20100014854 | TESTING AN OPTICAL NETWORK - The present invention relates to testing a passive optical network having a head end and a plurality of terminals, which terminals are connected to the network at a respective plug and socket arrangement located at customer premises. A test device is provided having a standard plug for connection in place of a terminal in the socket of the relevant customer premises. An identification device is provided in the socket. The test device is arranged to (i) read the identity of the identification device and (ii) test the line and transmit a result to the head end together with the identity so that the line to the customer premises can be tested remotely. When the line has been tested, the test device can be removed. Because the test device uses an existing connection, the optical (insertion) loss is reduced. | 01-21-2010 |
20100086298 | ENFORCED ROUTING IN SWITCHED NETWORK FOR FRU VERIFICATION - A method implemented in a computer infrastructure having computer executable code having programming instructions tangibly embodied on a computer readable medium. The programming instructions are operable to configure an initiator-to-initiator message route in a switched fibre channel arbitrated loop (FCAL) network such that the initiator-to-initiator message route traverses a replacement field replaceable unit (FRU). Additionally, the programming instructions are operable to transmit a verification initiator-to-initiator message along the initiator-to-initiator message route to verify proper operation of the replacement FRU. | 04-08-2010 |
20100092168 | OPTICAL COHERENT RECEIVER, APPARATUS FOR AND METHOD OF MONITORING PERFORMANCE THEREOF - The present invention relates to an optical coherent receiver and an apparatus for and a method of monitoring performance thereof. The apparatus for monitoring performance of the optical coherent receiver makes use of a first signal and a second signal from the optical coherent receiver to monitor performance of the optical coherent receiver, and comprises a first subtracter, for subtracting the second signal from the first signal to obtain a first subtraction result; a squarer, for obtaining a square of the first subtraction result; a delayer, for delaying the first subtraction result; a multiplier, for multiplying the first subtraction result with the delayed first subtraction result; and a second subtracter, for subtracting the result of the multiplier from the result of the squarer. | 04-15-2010 |
20100098408 | DETECTION OF CHANGES IN AN INTERVAL OF TIME BETWEEN OPTICAL OR ELECTRICAL SIGNALS - A method is disclosed for detecting changes in an interval of time (ΔT) between an optical or electrical signal and an optical or electrical reference signal using a photodetector. The method may be used to synchronize an optical or electrical signal with an optical or electrical reference signal. An apparatus for carrying out the method is also disclosed. The method comprises the steps of: receiving the optical signal and the optical reference signal by means of the photodetector, outputting an electrical response signal at an output of the photodetector, the electrical response signal having a frequency spectrum which depends on the interval of time (ΔT), filtering a selected harmonic from the frequency spectrum of the electrical response signal which has been output, and detecting changes in the interval of time (ΔT) from changes in the amplitude of the selected harmonic. | 04-22-2010 |
20100098409 | COMMUNICATION PATH SETTING METHOD, COMMUNICATION SYSTEM, OPTICAL PROPAGATION APPARATUS AND OPTICAL TRANSMISSION/RECEPTION DEVICE - An optical propagation apparatus and method setting a communication path to propagate a signal light between optical transmission/reception devices in different optical propagation apparatuses through a propagation path for multiplex communication. The optical propagation apparatus includes a conduction confirmation unit to confirm the conduction of the conduction confirming light output from one of the optical transmission/reception devices, and a setting unit to set, as a part of the communication path, the propagation path of the conduction confirming light following a point where the conduction of the conduction confirming light is confirmed by the conduction confirmation unit. | 04-22-2010 |
20100098410 | METHOD AND APPARATUS FOR AUTOMATIC PORT INTERCONNECTION DISCOVERY IN AN OPTICAL NETWORK - To automatically discover the port connections for all nodes in a network, a master node generates a predetermined optical signal and transmits the predetermined optical signal to a neighboring node, which signal identifies the port on which the master node transmitted the predetermined signal. The recipient transmits a reply signal to the predecessor node and to the master node via a control channel, which identifies a port on which the predetermined optical signal was received by the neighboring node. By successively repeating this process in a methodical manner, the master node can discover all of the port interconnections in the optical network. Also each node can discover all its port interconnections to its neighbors. Moreover, by selecting controlling the state (e.g., terminate, open) of the ports of the non-master nodes in the network, the master node can control which nodes receive the predetermined signal, thereby ensuring proper port discovery. | 04-22-2010 |
20100183295 | ROGUE ONU DETECTION VIA PHOTONIC MIXING - A system, method, and computer readable medium for rogue Optical Network Unit (ONU) detection via photonic mixing, comprises a first Wavelength Division Multiplexer (WDM), a second WDM communicably coupled to the first WDM, a non-linear medium communicably coupled to the second WDM, and a photodetector communicably coupled to the non-linear medium, wherein the first WDM transmits a first upstream beam and a second upstream beam to the second WDM, wherein the first upstream beam is a normal upstream beam and wherein the second upstream beam is a rogue upstream beam, wherein the second WDM transmits the normal upstream beam and the rogue upstream beam to the non-linear medium, wherein the non-linear medium mixes the normal upstream beam and the rogue upstream beam resulting in a mixed beam, wherein the non-linear medium transmits the mixed beam to the photodetector, and wherein the photodetector analyzes the mixed beam to indicate the presence of a rogue ONU. | 07-22-2010 |
20100183296 | Systems and Methods for Diagnostic Monitoring of Optical Modulation Amplitude at an Optical Receiver Using Automatic Gain Control - Optical receivers and a method for providing a diagnostic measurement of optical modulation amplitude at other than a signal output of an optical receiver are invented and disclosed. The method includes the steps of applying a representation of an output of an optical detector to a circuit that determines a difference between a first signal level and a second signal level that is different from the first signal level and buffering the difference between the first signal level and the second signal level received from the circuit. The optical receivers include an optical detector, a transimpedance amplifier that applies automatic gain control, a circuit that determines a difference between two signal values and a limiting post amplifier. The receivers provide a diagnostic measure that can be compared to certain thresholds relating to known bit error rates or applied in a calculation to generate an absolute optical modulation amplitude value. | 07-22-2010 |
20100183297 | OPTICAL FIBER SENSOR HAVING ELECTRICAL CONNECTORS - An optical fiber sensor has a sensor band of optical sensor fibers. The band is connected on both ends to a transmitter unit and a receiver unit, the transmitter unit feeding optical signals into the optical fibers, the signals being optically evaluated with regard to the intensity thereof by the receiver unit. Parallel electrical conductors are located in the sensor band and can, for example, be designed as ribbon cables. The electrical conductors allow an additional electrical connection of the transmitter unit and the receiver unit, so that external cables advantageously need only be connected to one of the two units. The difficulty of connection is thereby reduced, and the wearing comfort is increased for the application of the fiber sensor, for example, as a back sensor. | 07-22-2010 |
20100202772 | Method and Device For Validating a Link Attribute In The Nodes Of Automatically Switched Optical Network - The invention provides a method and device for verify link attributes in a node of an Automatically Switched Optical Network. In the Automatically Switched Optical Network, the node and another node are connected to a first port and a second port of one bidirectional link respectively, and the bidirectional link is divided into a first unidirectional link from the first port to the second port and a second unidirectional link from the second port to the first port. The method comprising the steps of: configuring a plurality of link attributes of the first unidirectional link in the node; receiving in the node a plurality of link attributes of the second unidirectional link configured in the another node from the another node; and comparing in the node the plurality of link attributes of the first unidirectional link with the received plurality of link attributes of the second unidirectional link respectively to check whether they match each other. | 08-12-2010 |
20100215357 | Optical Sampling With Coherent Detection - An optical sampling arrangement for high-speed measurement of the time-varying electric field of a data-carrying optical input signal. The present invention includes optical sampling of the optical input signal, followed by coherent mixing with a reference laser source in an optical hybrid solution. The generated streams of mixed optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the data-carrying optical input signal. | 08-26-2010 |
20100266275 | Optical Network Testing - A method includes generating a test signal and modulating the test signal. The method may also include transmitting the test signal on an optical path, where the optical path may include a number of add-drop multiplexer devices and amplifiers. The method may also include receiving the test signal at a destination device and converting the received test signal into an electrical signal. The method may further include identifying a portion of the electrical signal that is associated with the modulated test signal. | 10-21-2010 |
20100272431 | IN-SERVICE OPTICAL NETWORK TESTING - A system may include a first measurement device configured to be coupled to a first node in an optical path being measured. The first measurement device may be configured to generate a signal at an initiating device; identify an unused channel in an optical path, wherein the optical path includes at least two spans; and transmit the signal on the unused channel. A second test device may be configured to be coupled to a last node in the optical path being measured. The second measurement device may be configured to: receive the signal at a destination device; compensate the signal for chromatic dispersion (CD) and/or polarization mode dispersion (PMD) effects; and determine CD and/or PMD measurements associated with the optical path being measured based on the compensation. | 10-28-2010 |
20110013904 | PASSIVE OPTICAL NETWORK (PON) IN-BAND OPTICAL TIME DOMAIN REFLECTOMETER (OTDR) - An in-band OTDR uses a network's communication protocols to perform OTDR testing on a link. Because the OTDR signal (probe pulse) is handled like a data signal, the time required for OTDR testing is typically about the same as the time required for other global network events, and is not considered an interruption of service to users. A network equipment includes an optical time domain reflectometry (OTDR) transmitter and receiver, each operationally connected to a link to transmit and receive, respectively, an OTDR signal. When an OTDR is to be performed, a network device operationally connected to the link actuates the OTDR transmitter to transmit the OTDR signal on the link during a determined test time based on a communications protocol of the link, during which data signals are not transmitted to the network equipment. A processing system processes the OTDR signal to provide OTDR test results. | 01-20-2011 |
20110019994 | High Bandwidth Demodulator System And Method - A method of analysing an input signal, the method including the steps of: (a) dividing a first input signal into first and second orthogonal signal polarisation components; (b) dividing a second input signal into orthogonal first and second orthogonal local polarisation components; (c) mixing the first orthogonal signal component with the second orthogonal local polarisation component to provide a first mixed signal; (d) mixing the second orthogonal signal component with the first orthogonal local polarisation component to provide a second mixed signal; (e) analysing the first and second mixed signal to determine the polarisation or phase information in the input signal. | 01-27-2011 |
20110076011 | Apparatus for monitoring optical signal quality specifically applicable to NRZ optical signals - A binary intensity-modulated light signal to be monitored is split into three signal beams. The first and third beams are converted into electric signals. Frequencies of the first electric signal corresponding to a bit rate pass a filter bank. The intensity of the filtered signal is detected by an RF intensity detector. A delaying interferometer makes the second beam interfere with a light signal obtained by delaying the second beam by a predetermined delay time. One of the resulting interference signals is converted into an electric signal. The intensities of the amplified signal are detected by another RF intensity detector. The third electric signal is smoothed by the filter bank, and its average intensity is detected by a power detector. The intensities of the detected, amplified signals are found relative to the detected average intensity to determine wavelength dispersion and optical SNR or the tendency of their changes. | 03-31-2011 |
20110129213 | METHOD AND APPARATUS FOR MEASURING A FACTOR CHARACTERIZING A BALANCED DETECTION DEVICE - A method is provided for measuring a factor, called herein the single-port rejection ratio (SPRR), characterizing a balanced detection device. The SPRR is representative of the ratio of the weak differential output current measured under illumination of a single-port of the balanced detection device to the strong measurable differential output current obtained under dual-port illumination. An apparatus for measuring the SPRR is also provided. | 06-02-2011 |
20110142439 | HIGH SPEED IN-SERVICE OPTICAL NETWORK TESTING - A method may include generating a signal at an initiating device. A channel in an optical path may be identified, with the optical path including at least two spans. Simulated polarization mode dispersion (PMD) is injected into the signal to generate a test signal. The test signal is transmitted on the channel and received at a destination device. PMD effects in the test signal are compensated, and a measurement of PMD for the test signal is determined based on the compensation, the PMD for the test signal including PMD for the channel and the injected PMD. A measurement of the PMD for the channel is determined based on the PMD for the test signal and the injected PMD. | 06-16-2011 |
20110142440 | MEASUREMENT OF POLARIZATION MODE DISPERSION OR DIFFERENTIAL GROUP DELAY OF AN OPTICAL PATH - A method may include generating first and second optical signals and modulating the first and second optical signals simultaneously to synchronize the signals. The method may include varying the polarization of the second optical signal and transmitting the first and second optical signals. The method may include receiving the first and second optical signals, wherein the signals traveled along a same optical path. The method may include determining a plurality of differential travel delays between the first and second optical signals over a period of varying polarizations and determining a differential group delay based on the maximum and the minimum differential travel delays. | 06-16-2011 |
20110158638 | PON SYSTEM AND REDUNDANCY METHOD - An optical line terminal performs transmission to optical network units using a light signal having a wavelength different for each of systems, allocates communication time to data, which is transmitted from the optical network units, in a time division manner for each of the systems, selects, for each of the optical network units, a system for performing data transmission, and transmits the data using a wavelength corresponding to the selected system. The optical network unit includes: ith blocking filter that removes a component other than a component in a predetermined wavelength band, which is set to correspond to an ith system, from a received light signal; and ith PON processing unit that applies termination processing to signals and transmitting the data based on an allocation result of the optical line terminal. The PON system includes n optical network units corresponding to i=1 to i=n. | 06-30-2011 |
20110200324 | METHOD AND SYSTEM FOR OPTICAL CONNECTION VALIDATION - An optical add/drop multiplexer (OADM) having an Add path for adding optical channel signals input through a plurality of Add ports to an outbound dense wavelength division multiplexed (DWDM) signal, and a Drop path for switching selected channels from an inbound DWDM signal to one or more of a plurality of Drop ports. The OADM has a loopback connection between the Add path and the Drop path. The loopback connection couples a selected loopback channel wavelength from the Add path to the Drop path. The physical connection between a transceiver and the OADM can be verified by connecting the transmitter to an Add port of the OADM and the receiver to a Drop port of the OADM. The OADM is controlled to switch the selected loopback channel wavelength in the Drop path to at least one intended drop port to which the receiver should be connected, and the transmitter is controlled to transmit a predetermined test signal using the loopback channel wavelength. Detecting the test signal by the receiver verifies that the receiver is connected to the at least one intended drop port. | 08-18-2011 |
20110206367 | SWITCHABLE FIBER TERMINATION - An apparatus, system and method are provided for a switchable fiber termination (SFT) incorporated into an optical network device that responds to a test signal received via an optical network carrying data. The test signal may be a part of a multiplexed signal carrying data and is separated from the data by a wavelength division multiplexer. The SFT may be used to determine the characteristics of an optical network, including the operational status of optical network devices. | 08-25-2011 |
20110236014 | OPTICAL-TRANSMISSION-LINE INSPECTION APPARATUS, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL-TRANSMISSION-LINE INSPECTION METHOD - An apparatus includes a pulse generator configured to generate a wavelet pulse defined by a setting device, an optical modulator configured to output an optical wavelet pulse based on the wavelet pulse generated by the pulse generator to an optical transmission line, and an analyzer configured to analyze a reflected wavelet pulse from the optical transmission line. | 09-29-2011 |
20110236015 | METHOD OF SWITCHING OPTICAL PATH, AND APPARATUS THEREOF - Terminals of upstream and downstream sides of an in-service line and a detour line are connected by optical couplers. An optical oscilloscope is connected to one optical coupler, and a chirped pulse light source is connected to the other optical coupler to thereby form dualized lines. The detour line includes an optical line length adjuster for compensating for the phase difference of optical transmission signals that occurs because of the optical line length difference with the in-service line. Pulse light in which an optical frequency is chirped is transmitted from the chirped pulse light source. The pulse light is branched by the second optical coupler, passes through the in-service line and the detour line, is multiplexed again by the first optical coupler, and is measured by the optical oscilloscope. While matching an arrival time of the pulse light, the optical line length is adjusted by the optical line length adjuster so as to minimize the size of upper and lower limits of an interference waveform generated in an upper part of the pulse light waveform or so as to make a frequency of an interference waveform become zero. | 09-29-2011 |
20110255861 | Method and Apparatus for Determining a Signal Transfer Characteristic Along a Light Path in an Optical Network - There is provided a method for determining a signal transfer characteristic along a light path between a first point and a second point in an optical network. The optical network comprises at least one optical element situated in the light path. The method comprises transmitting a plurality of optical test signals of different bandwidths from the first point along the light path. Each signal has a known bandwidth and a known power. The method further comprises receiving the optical test signals at the second point after they have travelled along the light path and measuring the power of each received optical test signal. The method also comprises determining the signal transfer characteristic along the light path from the power measurements. | 10-20-2011 |
20110268437 | BIT ERROR GENERATION SYSTEM FOR OPTICAL NETWORKS - A system may include an optical bit error generator comprising a high instantaneous power light source. An optical coupler may couple an output of the optical bit error generator to a traffic fiber. A device under test receives a traffic signal via the traffic fiber. A performance monitor is coupled to the device under test to determine responsiveness of the device under test to a bit error condition simulated by the optical bit error generator, wherein the high instantaneous power light source in the optical bit error generator is configured based on a protocol of a traffic signal in the traffic fiber and the bit error condition. | 11-03-2011 |
20110268438 | UNIDIRECTIONAL ABSOLUTE OPTICAL ATTENUATION MEASUREMENT WITH OTDR - Devices and methods for optical measurements in point-to-point and point-to-multipoint networks, e.g. like PON networks with splitters are described in which reflected power from some known reflections at the end of the lines is used to determine the attenuation and stability of the attenuation of each line. Also a reference reflection is used at the beginning of the network so that an absolute loss measurement between the points of reflection and the reference reflection can be made. In a further aspect wavelength selective stable reflections and reflectors are used, to provide reflections in a wavelength range that does not interfere with normal operation. | 11-03-2011 |
20110274426 | DETECTING METHOD, APPARATUS, AND SYSTEM IN AN OPTICAL DISTRIBUTION NETWORK - A detecting method, an apparatus, and a system in an Optical Distribution Network (ODN) are provided. The method includes: an Optical Line Termination (OLT) reserves a test window, and an Optical Network Unit (ONU) stops sending an uplink signal in the test window, the OLT emits a downlink test signal having a wavelength the same as that of the uplink signal in the test window, the OLT receives backward signals of the downlink test signal, in which the backward signals include a backward scattered signal and a backward reflected signal, processes the backward signals, and obtains state information of the ODN according to the backward signals. The method does not need to add other hardware, and the downlink signal is sent normally in the downlink. The implementation is low in the cost and easy in the technology. | 11-10-2011 |
20110293265 | Optical Access Network, Secondary Network Side Termination Node of an Optical Access Network, and Method for Operating a Network Side Termination Node - An optical access network has a first and a second network-side termination node, the first including a first transceiver arrangement connected to a first optical link, configured to send a first signal to a customer side termination node including a transceiver for receiving the first signal, and the second including a second transceiver arrangement connected to a second optical link and configured for sending a second signal to a transceiver of a customer-side termination node via the second link. The transceiver of the customer side termination node has a loopback element emitting a monitoring signal back to the network side termination nodes. Both network-side termination nodes have a link failure detector receiving the monitoring signal. | 12-01-2011 |
20120020659 | Polarization Monitoring in Polarization Division Multiplexing in Optical Communications - Systems and techniques for optical communications based on polarization division multiplexing are described. | 01-26-2012 |
20120057865 | COMMUNICATION SYSTEM AND TIME SYNCHRONIZATION METHOD - In a communication system using a PON, time synchronization of a slave device such as a base station is realized with respect to a master device such as an L2SW or the base station. Time information acquired by a GPS satellite is corrected by ranging information of a discovery function of an OLT so as to be reflected on time information of each ONU. A propagation delay from the L2SW to the OLT is obtained with the use of a delay estimation mechanism, a propagation delay from the OLT to the ONU which is obtained by ranging is added to obtain a propagation delay from the L2SW to the ONU. The obtained propagation delay from the L2SW to the ONU is added to the transmitted time stamp value whereby a time stamp value received at a base station or femtocell side becomes a time into which the propagation delay to the ONU is incorporated, and absolute values of clock timers can be synchronized with each other. The addition process can be realized by rewriting the time stamp value of the packet within the OLT or the ONU. | 03-08-2012 |
20120121250 | MEASURING DIFFERENTIAL GROUP DELAY IN AN OPTICAL FIBER - A system includes an optical transmitter configured to generate an optical signal that includes a scrambled polarization state; and output the optical signal via an optical fiber associated with a network path that is transporting network traffic. The system also includes an optical receiver configured to receive the optical signal; measure a polarization associated with the optical signal; determine, based on the polarization, a degree of polarization associated with the test signal; identify a differential group delay associated with the test signal based on the degree of polarization; output a notification that the optical fiber is available to carry high capacity traffic when the differential group delay is less than a threshold, where the high capacity traffic includes a data rate that his greater than another threshold; and output a notification that the optical fiber is not available to carry the high capacity traffic when the differential group delay is not less than the threshold. | 05-17-2012 |
20120121251 | MONITORING AND CONTROL OF ELECTRONIC DEVICES - A method, a system, and a computer program product for managing one or more electronic devices. Performance of an electronic device is monitored and presented to a user through a digital agent interface. The performance of the electronic device is controlled automatically by digital agent through the digital agent interface. The invention also enables automatic testing of the electronic device through the digital agent interface by setting up test configurations, activating test signals, and interpreting any error codes that may be generated. | 05-17-2012 |
20120121252 | OPTICAL COMMUNICATION SYSTEM FOR SUPPORTING REMOTE OPERATION MANAGEMENT - Provided is an optical communication system including: a remote control device for generating OAM (Operation, Administration, and Maintenance) signal including OAM information for equipment, converting the OAM signals to OAM optical signals, overlaying the OAM optical signals and communication upstream signals transmitted to a Communication Stations device, and controlling the transmission of the overlaid signals to the Communication Stations device; and the Communication Stations device for generating OAM control signals, converting the OAM control signal to OAM optical control signals, overlaying the OAM optical control signals and optical communication downstream signals transmitted to the remote control device, and controlling the transmission of the overlaid control signals to the remote control device. | 05-17-2012 |
20120134665 | Testing of Transmitters for Communication Links by Software Simulation of Reference Channel and/or Reference Receiver - A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter under test and the resulting optical output is captured, for example by a sampling oscilloscope. The captured waveform is subsequently processed by the software simulation, in order to simulate propagation of the optical signal through the reference channel and/or reference receiver. A performance metric for the transmitter is calculated based on the processed waveform. | 05-31-2012 |
20120155857 | METHOD, APPARATUS AND UNIT FOR DETECTING FAULT OF SUBMARINE DEVICE - The embodiments of the present invention relate to optical communication technologies, and provide a method, an apparatus, and a unit for detecting a fault of a submarine device. The apparatus includes: a pair of optical couplers that are respectively set on two optical cables for transmitting optical signals in opposite direction and are configured to receive or send optical detection signals through the optical cables, where: the two optical couplers are connected through an optical fiber that transmits an optical detection signal, and a photosensitive component is set on the optical fiber and is configured to adjust an optical parameter of the optical detection signal by perceiving change of an ambient environment state parameter when a fault occurs. The embodiments of the present invention bring benefits of detecting whether a target submarine device is faulty, and locating a cause for the fault of the submarine device accurately. | 06-21-2012 |
20120163801 | OPTICAL FIBER COMMUNICATION SYSTEM - There is provided an optical fiber communication system restricting enlargement of the diameter of an optical fiber as well as enabling achievement of a large-capacity optical communication with a small number of optical fibers. | 06-28-2012 |
20120177363 | OPTICAL SIGNAL OUTPUT APPARATUS, ELECTRICAL SIGNAL OUTPUT APPARATUS, AND TEST APPARATUS - To efficiently apply jitter to an optical signal using a simple configuration, provided is an optical signal output apparatus that outputs an optical pulse pattern signal including jitter, the optical signal generating apparatus comprising a light source section that outputs an optical signal having an optical frequency corresponding to a frequency control signal; an optical modulation section that modulates the optical signal output by the light source section, according to a designated pulse pattern; and an optical jitter generating section that delays an optical signal passed by the optical modulation section according to the optical frequency, to apply jitter to the optical signal. | 07-12-2012 |
20120177364 | METHOD AND APPARATUS FOR AUTOMATIC DISCOVERY IN OPTICAL TRANSPORT NETWORKS - In order to improve the link adjacency discovery in an Optical Transport Network, a method and related network nodes are provided. A first network node ( | 07-12-2012 |
20120207467 | Path Computation Element System and Method of Routing and Wavelength Assignment in a Wavelength Switched Optical Network - The disclosure includes an apparatus comprising a path computation element (PCE) that manages the processes of routing in an optical network, wherein the PCE receives a path computation request and provides a wavelength range to a network element (NE), and wherein the NE assigns a wavelength from the wavelength range. Also disclosed is an apparatus comprising a path computation client (PCC) that sends a path computation request to a path computation client (PCE) using path computation element communication protocol (PCEP), and receives a routing and wavelength assignment (RWA) reply to the path computation request using PCEP, wherein the RWA reply comprises an PCEP error message comprising a PCEP error object and an error value to indicate errors associated with the RWA request. | 08-16-2012 |
20120224847 | Quadrature Time Skew Detection for Coherent Optical Signals - A method for detecting and measuring time skew in high-speed DP-QPSK coherent optical receivers is described. | 09-06-2012 |
20120230673 | MEASUREMENT OF ACCUMULATED CHROMATIC DISPERSION IN AN OPTICAL DATA TRANSMISSION NETWORK - A method of measuring accumulated chromatic dispersion in an optical data transmission network includes the following method steps: a) sending a first bit pattern with at least one first pulse at a first wavelength and a second bit pattern with at least one second pulse at a second wavelength over an optical fiber; b) receiving the first bit pattern and the second bit pattern; c) determining a relative temporal shift between the first bit pattern and the second bit pattern; and d) calculating the accumulated chromatic dispersion from the relative temporal shift. | 09-13-2012 |
20120237202 | COHERENT OPTICAL RECEIVER, APPARATUS AND METHOD FOR DETECTING INTER-CHANNEL SKEW IN COHERENT OPTICAL RECEIVER - In a coherent optical receiver, sufficient demodulation becomes impossible and consequently receiving performance deteriorates if an inter-channel skew arises, therefore, a coherent optical receiver according to an exemplary aspect of the invention includes a local light source, a 90° hybrid circuit, an optoelectronic converter, an analog to digital converter, and a digital signal processing unit; wherein the 90° hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs a plurality of optical signals separated into a plurality of signal components; the optoelectronic converter detects the optical signals and outputs detected electrical signals; the analog to digital converter quantizes the detected electrical signals and outputs quantized signals; the digital signal processing unit includes a skew compensation unit for compensating a difference in propagation delay between the plurality of signal components, and an FFT operation unit for performing a fast Fourier transform process on the quantized signals; and wherein the difference in propagation delay is calculated on the basis of a plurality of peak values with a central focus on one peak value in the results of performing the fast Fourier transform process. | 09-20-2012 |
20120243863 | Optical Transceiver Integrated with Optical Time Domain Reflectometer Monitoring - An optical transceiver having an integrated optical time domain reflectometer monitoring unit and methods for using the same are disclosed. The disclosure relates to an optical transceiver comprising an optical device comprising a wavelength division multiplexing system (WDM), a data signal driver, a data signal limiting amplifier, and an optical time domain reflectometer (OTDR) data processing module. Furthermore, the optical transceiver is particularly advantageous in an optical line terminal (OLT) and/or a passive optical network (PON). The integrated OTDR data processing module can protect the optical transceiver, ensure successful monitoring data, simplify network wiring and decrease system and network costs by decreasing the number of OTDR modules and WDM units. | 09-27-2012 |
20120243864 | OPTICAL COMMUNICATION DEVICE AND OPTICAL COMMUNICATION METHOD - An optical communication device includes an optical switch that switches a path of an optical signal; a first path that transmits an optical signal between a first communication unit and the optical switch; a second path that transmits an optical signal between a second communication unit and the optical switch; and a switch controller that controls the optical switch. After an optical connection between the first communication unit and the optical switch and an optical connection between the second communication unit and the optical switch are checked, the switch controller switches the path of the optical signal selected by the optical switch to enable optical communication between the first communication unit and the second communication unit. | 09-27-2012 |
20120251098 | Method, apparatus and system for high-speed transmission on fiber optic channel - Multi-carrier modulation fiber optic systems constructed using a series of electrical carriers, modulating the data on the electrical carriers and combining the carriers to form a wideband signal. The wideband signal can then be intensity modulated on a laser and coupled to a fiber optic channel. A receiver may then receive the laser signal from the fiber optic channel and convert it into an electrical signal. Multi-carrier modulation may be applied to existing fiber channels, which may be of lower quality. Existing fiber channels may have characteristics which prevent or restrict the transmission of data using intensity modulation at certain frequencies. An adaptive multi-carrier modulation transmitter may characterize an existing fiber optic channel and ascertain the overall characteristics of the channel. The transmitter and receiver can then be configured to use various bandwidths and various modulations in order to match the transfer characteristic of the fiber channel. A series of adaptive multi-carrier modulation transmitters and receivers can be integrated on a single integrated circuit. If multiple adaptive receivers and transmitters are integrated on a single integrated circuit, they may be used to upgrade existing networks by adding different wavelength lasers for the transmission of data in order to achieve any capacity desired. Each receiver and transmitter may characterize the fiber for its particular wavelength laser and may configure the modulation and bandpass to the fiber's characteristics. | 10-04-2012 |
20120251099 | Multiplexer Lane Alignment for High-Speed Data Systems - Patterns detected by a low-speed receiver at the output of a high-speed multiplexer are used to determine when multiplexer input lanes are deskewed. | 10-04-2012 |
20120288274 | OPTICAL NETWORK SYSTEM AND DEVICES ENABLING DATA, DIAGNOSIS, AND MANAGEMENT COMMUNICATIONS - An optical transmitter module includes an optical transmitter configured to emit a first optical signal that includes a user data signal having a first frequency and comprising user data associated with the first communication channel. A management diagnostic modulator can superimpose a diagnostic waveform to the user data signal. The diagnostic waveform has a second frequency associated with the first communication channel, wherein the second frequency is in a frequency range between about 10 KHz and about 10 MHz. A management unit can modulate the diagnostic waveform by a management data signal at a third frequency associated with the first communication channel. The management data signal includes management data for digital diagnostic monitoring signals (DDM) and the control of the first optical transceiver module. | 11-15-2012 |
20120301136 | COHERENT POWER COMBINING FOR SIGNALS THROUGH MULTIPLE SATELLITE COMMUNICATIONS CHANNELS - A communication system and method that allows a transmitter segment (ground end of uplink segment) to dynamically combine power from a plurality of propagation channels (transponders) to improve power levels of signals being transmitted, without affecting the receiver segment (user end of downlink segment) and the propagation segment (space segment), and without modifying propagation apparatus configurations (satellite). Specifically, the transmitter segment generates mixtures of input signals by using Wavefront-Multiplexing and transmits wavefront-multiplexed (WFM) signals through propagation channels to a receiver segment that coherently separates the mixtures of received WFM signals by using adaptive equalization and Wavefront-De-Multiplexing. The WFM signal mixtures allow an operator, or automated system, at the transmitter segment to dynamically allocate equivalent channel (transponder) powers according to continuously changing market demands by dynamically including change of relative input powers into ratios of the WFM signal mixtures being transmitted. | 11-29-2012 |
20120301137 | ERRONEOUS OPTICAL FIBER CONNECTION DETECTING METHOD AND NODE DEVICE - A node device includes a data pattern generator configured to generate different fixed patterns for a plurality of ports to insert the generated fixed patterns into optical signals output from a plurality of optical transmitters, an optical switch configured to switch outgoing paths of the optical signals to output the optical signals as a multiplexed signal from one of the ports, a detector configured to detect a frequency spectrum of the multiplexed optical signal, and a management part configured to monitor a peak frequency of the detected frequency spectrum to detect an erroneous optical fiber connection associated with the optical transmitters based on peak frequencies corresponding to the different fixed patterns for the respective ports. | 11-29-2012 |
20130039646 | Optical Monitoring in a Communications Network Element - A communications network element comprises an input to receive an input optical signal having an input spectral property and carrying input traffic, an output and a monitoring port. Optical signal processing apparatus to receive the input signal and to form an output optical signal having an output spectral property and carrying output traffic. An optical splitter to tap off a part of one of the input signal and the output signal to form a tapped signal having a respective one of the input spectral property and input traffic, and the output spectral property and output traffic. Optical signal transforming apparatus to receive the tapped signal and to apply an optical transfer function (OTF) to it to form an optical monitoring signal, and to provide the monitoring signal to the monitoring port. The OTF preserves the spectral property of the tapped signal and applies a time-domain obfuscation to the tapped signal. | 02-14-2013 |
20130051788 | PATH DISCOVERY IN A COMMUNICATIONS NETWORK - The invention relates to discovering a path in a communications network. Embodiments of the invention disclose determining whether at least two server trail termination points (TTPs) of the path are compatible, creating a server trail between the at least two TTPs, determining whether each TTP is framed by a respective client connection termination point (CCTP) of a higher layer, assigning a respective CCTP to each of the two TTPs, creating a link connection between the respective CCTPs, determining if one of the respective CCTPs is associated with a higher layer TTP, and if it is not so associated then determining if one of the respective CCTPs is constrained to a single TTP. The embodiments of the invention allow paths in a network to be determined after a change has taken place or a physical link has been created. | 02-28-2013 |
20130051789 | Monitoring Circuitry For Optical Transceivers - Monitoring signals associated with operating parameters of an optical transceiver are ascertained by using a comparator arrangement external to a micro-controller unit. Monitoring signals associated with these operating parameter are provided as inputs to a discrete arrangement of comparators and then evaluated against a known reference voltage source. The reference source is swept across a known range of values, and when the output of the comparator changes state, the value of the reference input associated with this transition is defined as the value of the specific monitoring input signal and stored within the proper memory location within the microcontroller portion of the transceiver monitor circuit. The digital output signal of the comparator is applied as an input to the microcontroller, which recognizes this digital signal as defining the specific value of the reference signal to use and equate with the value of the monitored signal. | 02-28-2013 |
20130051790 | COHERENT OPTICAL RECEIVER, APPARATUS AND METHOD FOR DETECTING INTERCHANNEL SKEW IN COHERENT OPTICAL RECEIVER - In a coherent optical receiver, sufficient demodulation becomes impossible and consequently receiving performance deteriorates if an interchannel skew arises, therefore, a coherent optical receiver according to an exemplary aspect of the invention includes a local light source; a 90-degree hybrid circuit; an optoelectronic converter; an analog-to-digital converter; and a digital signal processing unit, wherein the 90-degree hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs a plurality of optical signals separated into a plurality of signal components; the optoelectronic converter detects the optical signals and outputs detected electrical signals; the analog-to-digital converter quantizes the detected electrical signals and outputs quantized signals; and the digital signal processing unit includes a skew compensation unit for compensating a difference in propagation delay between the plurality of signal components, and a demodulation unit for demodulating the quantized signals. | 02-28-2013 |
20130077961 | TECHNIQUES FOR GENERATING LOW RATE DATA PATTERNS COMPLIANT WITH PASSIVE OPTICAL NETWORKS - An apparatus for generating a reflection analysis data pattern (RADP) being utilized for performing a reflection analysis in a PON. The apparatus comprises a data pattern generator for generating a low rate data pattern using a low rate polynomial; a high rate adaptor for increasing a rate of the low rate data pattern to a transmission rate of the PON; first and second scrambler polynomial generators for generating first and second data sequences according to a scrambler polynomial of the PON; a pre-scrambler for scrambling a high-rate data pattern with the first data sequence; a scrambler coupled to the pre-scrambler for scrambling the output of the pre-scrambler with a time-shifted signal of the second data sequence to result with the RADP; and an encapsulator for encapsulating the reflection analysis data pattern output by the scrambler in a plurality of downstream frames transmitted from an OLT to ONUs of the PON. | 03-28-2013 |
20130108258 | METHODS AND APPARATUS TO TEST A SUBSCRIBER LINE FOR A BROADBAND ACCESS SERVICE | 05-02-2013 |
20130114955 | Method and System for Testing Jitter Compatibility - A method and system for testing jitter compatibility are disclosed in the present invention, which includes: an interconnection testing board configured with a non-NRZ optical transponder needing to satisfy the board jitter performance specification, and according to the specification, testing the jitter performance of the interconnection testing board to indirectly judge whether the jitter compatibility of non-NRZ optical transponder at a line side of the interconnection testing board is qualified, wherein: at the line side and a client side of the interconnection testing board, a non-NRZ optical transponder to be tested and an NRZ optical transponder with qualified jitter performance are configured respectively, and the jitter performance of interconnection testing board is tested; if the qualified jitter performance of interconnection testing board is obtained through testing, believing that the jitter compatibility of non-NRZ optical transponder to be tested is qualified. | 05-09-2013 |
20130142506 | CLOSED LOOP OPTICAL MODULATION AMPLITUDE CONTROL - Systems and methods are provided for an optical modulation feedback circuit. The feedback circuit includes a low frequency comparison circuit configured to receive a monitoring signal generated by an optical detector, the monitoring signal being proportional to an amount of light generated by an optical transmission device that transmits based on a data signal that is received by an optical driver. The comparison circuit is further configured to generate a modulation control feedback signal that is transmitted to the optical driver based on a comparison of a low frequency component of the monitoring signal and a low frequency component of the data signal. | 06-06-2013 |
20130148959 | FIBER OPTIC TELECOMMUNICATIONS CARD WITH SECURITY DETECTION - A transceiver card for a telecommunications box for transmitting data over a first optical fiber and receiving data over a second optical fiber. The card has transmitter for transmitting data over the first optical fiber, the transmitter having a laser and a modulator, a fiber output optically connected to the laser for connecting the first optical fiber to the card, a fiber input for connecting the second optical fiber to the card, a receiver optically connected to the fiber input for receiving data from the second optical fiber, and an OTDR optically connected between the transmitter and the fiber output or between the receiver and the fiber input. An energy level detector is also provided between the receiver and the fiber input. | 06-13-2013 |
20130259469 | Apparatus And Method For Testing Fibers In A PON - A manner of providing for testing of access fibers in a PON (passive optical network) using OTDR (optical time-domain reflectometry). According to the invention, a PON includes an optical splitter module having one or more optical couplers that combines downstream light from 1×N optical splitter directing the output of an OLT (optical line terminal) and a cyclic AWG (arrayed waveguide grating) for transmission toward one or more ONUs (optical network units). The splitter module is preferably formed on a single semiconductor chip, such as a PIC (photonic integrated circuit) chip and may reside in an outside plant of the PON. | 10-03-2013 |
20130259470 | METHOD AND APPARATUS FOR TESTING OPTICAL FIBER AND PASSIVE OPTICAL NETWORK SYSTEM - A method for testing an optical fiber includes: receiving a test optical signal from an optical fiber network, and converting the test optical signal into a test current signal; receiving, by a transimpedance amplifier, the test current signal by using a first working mode and outputting a first test voltage signal; acquiring a swing of the first test voltage signal, and determining whether the swing of the first test voltage signal meets a preset condition; and receiving, by the transimpedance amplifier, the test current signal by using a second working mode and outputting a second test voltage signal when the swing of the first test voltage signal meets the preset condition, where an upper limit and a lower limit of a receiver dynamic range when the transimpedance amplifier works in the first working mode are different from those when the transimpedance amplifier works in the second working mode. | 10-03-2013 |
20130266307 | DIAGNOSTIC PORT FOR INTER-SWITCH AND NODE LINK TESTING IN ELECTRICAL, OPTICAL AND REMOTE LOOPBACK MODES - A diagnostic testing utility is used to perform single link diagnostics tests including an electrical loopback test, an optical loopback test, a link traffic test, and a link distance measurement test. To perform the diagnostic tests, two ports at each end of a link are identified and then statically configured by a user. The ports will be configured as D_Ports and as such will be isolated from the fabric with no data traffic flowing through them. This configuration can be static or can be on request or on errors. The ports will then be used to send test frames to perform the diagnostic tests. After completion of requested or on error testing the ports can return to normal operation. | 10-10-2013 |
20130266308 | COHERENT OPTICAL RECEIVER, DEVICE AND METHOD FOR DETECTING INTER-LANE SKEW IN COHERENT OPTICAL RECEIVER - The disclosed coherent optical receiver includes a local light source; a 90-degree hybrid circuit; an optoelectronic converter; an analog-to-digital converter; a skew addition unit; and a FFT operation unit. The 90-degree hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs multiple optical signals separated into a plurality of signal components. The optoelectronic converter detects the optical signal and outputs a detected electrical signal. The analog-to-digital converter digitizes the detected electrical signal and outputs a detected digital signal. The skew addition unit adds to the detected digital signal an additional skew amount whose absolute value is equal to, whose sign is opposite to a skew amount of a difference in propagation delay in each lane connected to each output channel of the 90-degree hybrid circuit. The FFT operation unit performs a fast Fourier transform on the output from the skew addition unit. | 10-10-2013 |
20130294763 | Optical Signal Power Selection and Control | 11-07-2013 |
20130302027 | OPTICAL MEASUREMENT METHOD AND SYSTEM - The present application is directed to the measurement of the intensity and phase of high speed optical signals. The present application uses a tunable optical local oscillator, an optical coupler, a photodiode and RF electronics. The tunable laser enables successive measurements to be taken across the optical spectrum allowing the system to measure extremely high bandwidth signals. The signal generated by the local oscillator comprises a component at a frequency between two adjacent modes of the periodic optical signal to be measured. The local oscillator and said periodic signal are optically mixed and sent to a photodiode, the measurement of the phase being based on isolating the resulting beat frequencies. This approach offers a significant improvement over existing time resolved approaches which are limited to the bandwidth of the photodiode (˜50 GHz). | 11-14-2013 |
20130315581 | OPTICAL TRANSMISSION SYSTEM INCLUDING OPTICAL EMITTING DEVICE AND OPTICAL RECEIVING DEVICES - An optical transmission system includes an optical emitting device and a plurality of optical receiving devices. The optical receiving devices are optically connected in series and one of the optical receiving devices is optically connected to the optical emitting device. Each of the optical receiving devices includes a control module, an optical receiving terminal, and an optical fiber amplifier. The optical emitting device emits out first optical signals or second optical signals. The control module transmits the first optical signals to the optical receiving terminal or transmits the second optical signals to the optical fiber amplifier. The optical fiber amplifier amplifies the second optical signals and sends the amplified second optical signals to the next optical receiving device. | 11-28-2013 |
20130322868 | METHOD AND APPARATUS FOR A RECONFIGURABLE OPTICAL ADD/DROP MODULE WITH LOOP-BACK FUNCTIONS - A method and apparatus for approaches for troubleshooting optical networks, particularly ROADM-based networks is described. The method includes designating a first port, of an optical communication node of a transport network, as an ingress for a loop-back optical signal to troubleshoot the transport network, designating a second port, of the optical communication node, as an egress for the loop-back optical signal, and establishing a loop-back connection between the first port and the second port to transport the loop-back optical signal. | 12-05-2013 |
20130322869 | Passive Optical Fiber Plant Analysis - In a first aspect, the method and apparatus of the present disclosure can be used to periodically and/or intermittently place one or more ONUs attached to a PON in a power savings mode so that an OTDR test can be performed. While in the power savings mode, the ONUs temporarily suspend their transmitter function and power down their upstream lasers. In a second aspect, the method and apparatus of the present disclosure can be used to coordinate the performance of OTDR during one or more periodic or intermittent discovery slots used to detect and register ONUs recently connected to the PON. Because new ONUs are infrequently connected to the PON and ONUs already registered are not permitted to transmit during the discovery windows, OTDR can be performed during these windows without impacting, to a great degree, the normal operation of the PON. | 12-05-2013 |
20130330070 | METHODS AND APPARATUS FOR PRE AND POST EQUALIZATION IN OPTICAL COMMUNICATIONS SYSTEMS - An optical communication system includes a transmission apparatus that transmits a test signal over an optical communication medium using a first optical modulation format, receives a reception report for the test signal, determines, based on the received reception report, a pre-equalization scheme, applies the pre-equalization to data transmitted from the transmitter side to generate pre-equalized data and transmits the pre-equalized data using a second optical modulation format based on the reception report. An optical reception apparatus receives the test signal, computes a channel transfer function based on the received test signal, and transmits the reception report. | 12-12-2013 |
20130330071 | CHARACTERIZATION OF NON-ASE NOISE ON OPTICAL SIGNALS - There is provided a method for determining a noise parameter characterizing an optical Signal-Under-Test (SUT) having a signal contribution, an Amplified Spontaneous Emission (ASE) noise contribution and a non-ASE optical noise contribution, such as a carrier-leakage contribution or a depolarized-signal contribution, within an optical-signal bandwidth. The method comprises acquiring optical spectrum trace(s) of the SUT, discriminating at least the non-ASE optical noise contribution from the ASE-noise contribution using the optical spectrum trace(s) and/or a trace obtained from the optical spectrum trace(s); and determining the noise parameter using discriminated non-ASE optical noise contribution and/or the discriminated ASE-noise contribution. | 12-12-2013 |
20130336646 | SYSTEMS AND METHODS FOR RECEIVING OPTICAL PULSES - Various embodiments for facilitating optical communications utilizing a apparatus are disclosed. One embodiment, among others, is an apparatus that comprises a dispersion element configured to transmit a beam through a plurality of optical paths in a spectral dispersion element to generate a spectrally dispersed beam. The apparatus further comprises a second-harmonic generation (SHG) element integrated into the dispersion element, the SHG element configured to generate second-harmonic light beam from the dispersed beam by splitting the dispersed beam into a plurality of beams, wherein the plurality of beams traverse a common axis. The apparatus further comprises a collimator configured to collimate the second-harmonic light beam over a predetermined path length and a phase decoder configured to receive the collimated beam and measure characteristics associated with the collimated beam. | 12-19-2013 |
20130343745 | Optical Coupler Testing System - A method and apparatus for testing an optical coupler. Inputs of the optical coupler are connected to output ports of an optical signal source. Outputs of the optical coupler are connected to input ports of an optical signal detector system. Optical signals sent through combinations of the inputs and the outputs of the optical coupler are measured using a switching system controlled by a controller to form measurements of the optical signals. | 12-26-2013 |
20130343746 | Signal Reflection Apparatus for Testing Optical Feedback - A satellite test signal reflection apparatus for testing transmitters sending out optical signals, the apparatus includes a plate that is at least partially permeable to optical signals. The plate has a base with a first surface with a residual reflective coating and a second surface. The residual reflective coating is configured to split an optical beam, which penetrates the plate in a first direction from the first surface to the second surface, into a reflective optical beam and a transmitted optical beam. | 12-26-2013 |
20140003805 | METHODS FOR GENERATING MULTI-LEVEL PSEUDO-RANDOM SEQUENCES | 01-02-2014 |
20140016926 | SYSTEM AND METHOD FOR PERFORMING IN-SERVICE OPTICAL NETWORK CERTIFICATION - A system and method for performing an in-service optical time domain reflectometry test, an in-service insertion loss test, and an in-service optical frequency domain reflectometry test using a same wavelength as the network communications for point-to-point or point-to-multipoint optical fiber networks while maintaining continuity of network communications are disclosed. | 01-16-2014 |
20140029933 | System for Determining a Propagation Time of an Optical Signal Between Two Optical Devices Using an Optical Link - A system is provided for determining a propagation time of an optical signal between two devices in an optical transmission network. The first device is designed to determine the propagation time following the transmission of an optical measurement signal in a propagation direction towards a second device using an optical link while passing through an intermediate device, which includes at least one amplifier and one chromatic-dispersion compensation module that introduces a delay, and following the reception an optical return signal from the second device using the same optical link in a direction opposite to the propagation direction. The measurement system is configured to extract the return signal output by the intermediate device; regenerate the extracted return signal; feed the regenerated signal into the optical link, at the input of the intermediate device; and obtain a return signal-reception time while taking account the delay introduced by said compensation module. | 01-30-2014 |
20140072296 | METHOD AND A SYSTEM FOR PHYSICAL LAYER MONITORING IN PASSIVE OPTICAL NETWORKS - A method and a system for physical layer monitoring in Passive Optical Networks. The system comprises: —a light source ( | 03-13-2014 |
20140072297 | OPTICAL FIBER LOOPBACK ADAPTER - A passive optical fiber loopback adapter includes a first transmission port, a second transmission port, a first reception port, and a second reception port. A non-switched optical device is connected to each of the ports. The non-switched optical device routes light signals from the first transmission port to an appropriate port, based on the wavelength of the light signal. For example, a transmission light signal having a first wavelength is routed automatically to the second transmission port. A test light signal having a second wavelength different than the first wavelength is routed automatically to the second reception port. | 03-13-2014 |
20140072298 | RADIO FREQUENCY SIGNAL TRANSCEIVING DEVICE AND METHOD THEREOF, SELF-OPTIMIZING OPTICAL TRANSMISSION DEVICE AND METHOD THEREOF - A radio frequency signal transceiving method and device thereof are proposed. The method is configured for a radio equipment controller (REC) of a radio frequency signal transceiving device to exchange radio signals between a plurality of Baseband Units (BBUs) and a plurality of Radio Equipments (REs) that respectively connected to a plurality of Remote Radio Units (RRUs), and the method includes but not limited to the step of: receiving a first radio downlink signal at least, generating a first downlink control signal, modulating the first radio downlink signal at least into a first analog downlink signal at a first frequency according to the first downlink control signal, multiplexing the first analog downlink signal and the first downlink control signal into an integrated analog downlink signal, converting the integrated analog downlink signal into an optical downlink signal, and transmitting the optical downlink signal. | 03-13-2014 |
20140079385 | TRANSMITTING DEVICE, COMMUNICATION SYSTEM, AND METHOD FOR TRANSMISSION LEVEL CONTROL - A transmitting device includes a transmitter configured to transmit signal light to an external receiver over a medium included in a transmission line; and a controller configured to control a transmission level of the signal light in accordance with a reception level of probe light which is input from the receiver over the medium in the transmission line. | 03-20-2014 |
20140079386 | COHERENT OPTICAL RECEIVER, APPARATUS AND METHOD FOR DETECTING INTERCHANNEL SKEW IN COHERENT OPTICAL RECEIVER - In a coherent optical receiver, sufficient demodulation becomes impossible and consequently receiving performance deteriorates if an interchannel skew arises, therefore, a coherent optical receiver according to an exemplary aspect of the invention includes a local light source; a 90-degree hybrid circuit; an optoelectronic converter; an analog-to-digital converter; and a digital signal processing unit, wherein the 90-degree hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs a plurality of optical signals separated into a plurality of signal components; the optoelectronic converter detects the optical signals and outputs detected electrical signals; the analog-to-digital converter quantizes the detected electrical signals and outputs quantized signals; and the digital signal processing unit includes a skew compensation unit for compensating a difference in propagation delay between the plurality of signal components, and a demodulation unit for demodulating the quantized signals. | 03-20-2014 |
20140086573 | METHOD, TRANSPORT APPARATUS, AND SYSTEM FOR DETECTING SUBMARINE OPTICAL CABLE LINE - A method for detecting a submarine optical cable line includes: splitting a detection signal input to a first optical functional unit in an optical functional module of an optical cable line into a first detection signal and a second detection signal; directly coupling and looping back the first detection signal to an output end of a second optical functional unit in a direction opposite to the first optical functional unit to constitute a first loopback path, and outputting a first detection loopback signal; looping back the second detection signal passing through the first optical functional unit to the output end of the second optical functional unit to constitute a second loopback path, and outputting a second detection loopback signal; and detecting a status of the submarine optical cable line according to power of the first detection loopback signal and power of the second detection loopback signal. | 03-27-2014 |
20140093233 | OPTICAL LINK AUTO-SETTING - A system includes two optical modules that perform auto-setting of the optical links between the optical modules. One optical module sends an optical signal with a test pattern to the other optical module. If the receiving module determines that the test pattern is successfully received, it sends a pass indication to the transmitting module, and the transmitting module can configure its driver path in accordance with a transmit current setting used to transmit the test pattern. If the test pattern is not successfully received, the receiving module sends a fail indication, and the transmitting module can increase the transmit current setting and resend the test pattern. When the system includes multiple optical channels, one channel can be tested while feedback is provided on another channel. The system can iterate through all optical channels until they are all configured. | 04-03-2014 |
20140112656 | RELAY DEVICE, RELAY METHOD, AND OPTICAL COMMUNICATION SYSTEM WHICH USES RELAY DEVICE - A relay device includes a first transmitting and receiving unit connected to a PON line on the upper-level side and performing mutual conversion between optical and electrical signals; a second transmitting and receiving unit connected to a PON line on the lower-level side and performing mutual conversion between optical and electrical signals; a relay processing unit relaying a downstream frame received by the first unit to the second unit, and relays an upstream frame received by the second unit to the first unit; and a control unit. The control unit follows upstream multiple access control performed by a station side device, for transmission of the upstream frame to be transmitted by the first unit to the station side device, and independently performs upstream multiple access control for reception of the upstream frame received by the second unit from a home side device. | 04-24-2014 |
20140119722 | TRANSMISSION APPARATUS, TRANSMISSION SYSTEM, AND FAILURE DETECTION METHOD - A transmission apparatus includes a plurality of output units and a detector. The plurality of output units is configured to couple to a plurality of transmission paths, respectively, branched from one transmission path. The plurality of output units includes at least one first output unit configured to transmit signal light selectively to one of the branched transmission paths, and at least one second output unit configured to transmit test light with a wavelength different from a wavelength of the signal light to another of the branched transmission paths. The detector is configured to decide a failure in the branched transmission paths, based on a result of detection of a reflected light of the test light received through at least one of the branched transmission paths. | 05-01-2014 |
20140119723 | OPTICAL MODULE AND DETECTION CIRCUIT THEREOF - The present invention discloses an optical module and a detection circuit thereof. The detection circuit includes: a sampling module, including a first potentiometer configured to convert a sampling current into a sampling voltage; an amplifying module, coupled to an output end of the sampling module and configured to amplify the sampling voltage; and an analog-to-digital conversion module, coupled to an output end of the amplifying module and configured to convert the amplified sampling voltage into a digital signal for detection. By arranging a potentiometer in a sampling module of a detection circuit, a resistance value of the sampling module can be adjusted, thereby adapting to responsivities of different modulators, increasing the locking speed of a modulator, preventing horizontal shifts of a locking point and a false locking point, and reducing the occupied PCB area. | 05-01-2014 |
20140126901 | FIBRE MONITORING IN OPTICAL NETWORKS - A method of monitoring an optical fibre comprises modulating an optical signal with a traffic signal; modulating the optical signal with an incoherent optical frequency domain reflectometry, IOFDR, test signal; transmitting the doubly modulated optical signal onto an optical fibre at a first end of the fibre; detecting scattered radiation output from the first end of the fibre; and analysing the detected scattered radiation using incoherent optical frequency domain reflectometry to determine a distance to a break in the optical fibre. Apparatus suitable for carrying out the method is also described, as well as an optical communications network employing the method. | 05-08-2014 |
20140133846 | OPTICAL LINK HANDSHAKE TECHNIQUES AND CONFIGURATIONS - Embodiments of the present disclosure provide optical link handshake techniques and configurations. In one embodiment, an optical module includes a laser driver corresponding with a channel of the optical module, a signal detector corresponding with the channel, and a link handshake state machine configured to control the laser driver to generate a connect pulse of a link handshake process to test an optical link between the channel and a corresponding channel of another optical module and monitor the signal detector to detect a connect pulse from the another optical module. Other embodiments may be described and/or claimed. | 05-15-2014 |
20140140690 | COHERENT OPTICAL RECEIVER, APPARATUS AND METHOD FOR DETECTING INTER-CHANNEL SKEW IN COHERENT OPTICAL RECEIVER - In a coherent optical receiver, sufficient demodulation becomes impossible and consequently receiving performance deteriorates if an inter-channel skew arises, therefore, a method for detecting inter-channel skew in a coherent optical receiver according to an exemplary aspect of the invention includes the steps of: outputting a plurality of optical signals separated into a plurality of signal components by making a test light from a test light source interfere with a local light from a local light source; detecting the optical signals and outputting detected electrical signals; quantizing the detected electrical signals and outputting quantized signals; performing a fast Fourier transform process on the quantized signals; and calculating a difference in propagation delay between the plurality of signal components on the basis of a plurality of peak values in the results of performing the fast Fourier transform process. | 05-22-2014 |
20140161439 | SUPERIMPOSING OPTICAL TRANSMISSION MODES - A method of superimposing N optical transmission modes for collective transmission along a multimode optical fiber is provided where each of the N optical signals comprises N distinct superimposed transmission modes (M | 06-12-2014 |
20140161440 | Testing of Elements Used In Communication Links - A receiver for a communications link includes a receiver module and a host receiver. These two components can be tested independently. In one embodiment, the receiver module is characterized with respect to noise and distortion. The noise performance can be determined by comparing input and output signals of the receiver module, to determine the relative noise of the receiver module. The distortion performance can be determined by comparing the distortion of input and output signals of the receiver module, using a reference host receiver that includes an equalizer. The host receiver can be tested by using a reference receiver module. | 06-12-2014 |
20140178063 | Apparatus and a Method - An apparatus including: addition circuitry configured to receive simultaneously a probe signal that has passed through a channel having a complex transmission and a reference signal and configured to produce at least: a plurality of weighted additions including an addition of the probe signal and the reference signal with different relative phase rotations between the probe signal and the reference signal for each weighted addition; and processing circuitry configured to use at least two of the plurality of weighted additions to determine a first quantitative parameter for the channel dependent upon the complex transmission for the channel. | 06-26-2014 |
20140186022 | METHOD AND APPARATUS FOR TESTING AN OPTICAL NETWORK - For testing an optical network, a transmission module transmits a first optical power level on a first optical port of an optical assembly. The optical assembly includes the first optical port, one or more of an optical cable and an optical waveguide, and a second optical port. The optical assembly is installed in an assembled computer in a state suitable for an end user. A measurement module measures a second optical power level on the second optical port, and a determination module determines a quality level by determining if the second optical power level is below a quality threshold value. The transmission module, the measurement module, and the determination module function within an assembled computer in a state suitable for an end user. | 07-03-2014 |
20140186023 | APPARATUS FOR MODULAR IMPLEMENTATION OF MULTI-FUNCTION ACTIVE OPTICAL CABLES - Apparatus enabling modular implementation of active optical cable (AOC) with multiple integrated functions including: integration of different types of data on the AOC via media conversion; distribution of electrical power over the AOC; electrical multiplexing data channels for optical fibers; integration of voltage regulators enabling AOC operation at different supply voltages; integration of voltage regulators to provide stable, low noise power source; ruggedized, blind-mateable electrical connectors; integration of electronics and optoelectronics inside a connector backshell; implementation of health monitoring and test channel enabling monitoring, test, and control of both ends of the AOC and monitoring and control of upstream systems and components; and enabling a form, fit, function replacement of existing electrical cables to improve SWaP, electromagnetic interference resiliency, length-bandwidth product, electromagnetic pulse resistance, signal integrity, system reliability, testability and maintenance. AOCs are customized for different connectors, pin-outs, electrical data combinations, power distribution and power supplies with minimal redesign/requalification. | 07-03-2014 |
20140193147 | System for Testing Passive Optical Lines - An optical splitter assembly including a splitter housing, a passive optical power splitter positioned within the splitter housing and a plurality of splitter output pigtails that extend outwardly from the splitter housing. Each of the splitter output pigtails including an optical fiber structure having a first end optically coupled to the passive optical power splitter and a second end on which a fiber optic connector is mounted. Each of the splitter output pigtails having a different test characteristic such that the splitter output pigtails can be individually identified during optical network testing. | 07-10-2014 |
20140212131 | System and Method for Fault Identification in Optical Communication Systems - A repeater that enables both bi-directional optical time domain reflectometry (OTDR) and loop gain monitoring techniques that may be employed, for example, in particularly long repeater spans. In one embodiment, the repeater includes high loss loopback (HLLB) paths configured to couple test signals between incoming and outgoing fiber paths. The HLLB paths are coupled from the outputs to the inputs of amplifiers within the repeater and couple both OTDR and loopback signals from an outgoing fiber path to an incoming fiber path so that may be returned to line monitoring equipment that transmitted the test signals. | 07-31-2014 |
20140255021 | OPTICAL CABLE TESTING AND MANAGEMENT - A method and apparatus for testing an optical cable is provided. In one embodiment, the apparatus may include a receiver for receiving a received pulse train through the optical cable. The apparatus may further include a cross-correlation system in communication with the receiver. The cross-correlation system may be adapted to determine a cross-correlation of the received pulse train and matched filter to an expected pulse train. The apparatus may further include a comparator in communication with the cross-correlation system. The comparator may be adapted to compare the cross-correlation to a threshold. The apparatus may also include an output transmitter, in communication with the comparator. The output transmitter may be able to output a comparison-result output that includes the results of the comparator comparison of the cross-correlation against a threshold. | 09-11-2014 |
20140255022 | OPTICAL NETWORK SWITCHING NODE IN MULTI-CHASSIS CLUSTER, OPTICAL BURST SYNCHRONIZATION METHOD, AND LINE CARD CHASSIS - An embodiment of the present invention provides an optical burst synchronization method. A synchronization method includes: selecting a reference chassis, and transmitting, by an output port corresponding to an FTL in the reference chassis, an optical burst test signal respectively to receive ports corresponding to ORs in other line card chassis, where the optical burst test signal carries a transmission timeslot number; and acquiring, by a receive port corresponding to an OR in each line card chassis, according to an optical path difference between the receive port corresponding to the OR in each line card chassis and the output port corresponding to the FTL in the reference chassis, time of receiving the optical burst test signal, and the transmission timeslot number, a time-phase difference between each line card chassis and the reference chassis, and calibrating a local clock phase according to the time-phase difference. | 09-11-2014 |
20140270750 | OPTICAL SOURCE MONITORING SYSTEM - An example embodiment includes an optical transmission device. The optical transmission device includes an optical source, a collimator lens, and an optical monitor. The optical source is configured to transmit a channel of light. The collimator lens is configured to reflect a portion of the channel of light. The optical monitor is arranged to receive at least a first portion of the reflected channel of light directly from the collimator lens, and is configured to communicate a gross electrical signal representative of received light including the first portion of the reflected channel of light. | 09-18-2014 |
20140270751 | Passive Optical Loopback - An optical communication device comprises an input/output configured to be coupled to an optical communications line, and a passive optical loopback module coupled to the input and configured to receive optical signals from the input/output, the loopback module being further configured to reflect incoming signals of a test wavelength to the input/output. | 09-18-2014 |
20140341563 | PROCESS CONTROLLER WITH INTEGRATED OPTICAL SENSING - The present disclosure relates generally to a process controller and more specifically to a process controller with integrated optical sensing. | 11-20-2014 |
20140341564 | METHOD AND SYSTEM FOR COMMON-MODE-REJECTION-RATIO (CMRR) CHARACTERIZATION OF AN INTEGRATED COHERENT RECEIVER - There are provided a method and a system for characterizing the CMRR of an ICR under test, which employ highly coherent light from two continuous-wave (CW) single-frequency lasers whose respective optical frequencies mutually differ by an offset defining an “Intermediate Frequency” (f | 11-20-2014 |
20140376906 | DIRECT REFERENCE SUBTRACTION SYSTEM FOR CONTROL OF OPTICAL TRANSMITTERS - An optical measurement system configured to determine whether an optical transmitter signal requires calibration is disclosed. In an implementation, the system includes an optical transmitter configured to emit electromagnetic radiation in limited spectrums of wavelengths at amplitudes based upon one or more transmission signals, and an optical sensor configured to detect the electromagnetic radiation in the limited spectrums of wavelengths and to generate a signal in response thereto. The system includes reference current sources configured to generate a respective reference current and a switch configured to transition between a first configuration and a second configuration based upon the transmission signals. The reference currents are configured to subtract from the signal generated by the optical sensor such that a difference remains. A comparison device is configured to compare the difference portion to a reference signal and output a signal indicative of the direction in which an optical transmitter driver signal should be adjusted. | 12-25-2014 |
20150016817 | DEVICE INTERFACE APPARATUS, TEST APPARATUS, AND TEST METHOD - A test apparatus that easily tests a device under test having an optical interface. Provided is a test method, a test apparatus, and a device interface apparatus on which is mounted a device under test having an optical interface, the device interface apparatus comprising a device mounting section on which the device under test is mounted; an optical connector that is connected to the optical interface of the device under test; and an optical signal detecting section that detects an optical signal output from at least one of the optical interface and the optical connector, before the optical interface of the device under test mounted on the device mounting section is connected to the optical connector. | 01-15-2015 |
20150078740 | FIBER OPTIC COMMUNICATIONS NETWORK - A fiber optic-based communications network includes: a power insertion device, connected to multiple fiber links from a data source, configured to provide power insertion to a hybrid fiber/power cable connected to at least one fiber link of the multiple fiber links; the hybrid fiber/power cable, connecting the power insertion device to a connection interface device, configured to transmit data and power from the power insertion device to the connection interface device; and the connection interface device, configured to provide an interface for connection to an end device via a power over Ethernet (PoE)-compatible connection and to provide optical to electrical media conversion for data transmitted from the power insertion device to an end device via the hybrid fiber/power cable and the PoE-compatible connection. | 03-19-2015 |
20150086192 | DETERMINING METHOD, DETERMINING OPTICAL MODULE, AND OPTICAL COMMUNICATION APPARATUS - In order to determine a connection state of an optical fiber that connects a transmitting terminal and a plurality of receiving terminals, a test signal having a wavelength corresponding to a wavelength of an optical signal capable of being received at one receiving terminal among the plurality of receiving terminals is generated by clipping a portion of amplified spontaneous emission light. The generated test signal is transmitted through the optical fiber. Optical power of the test signal is detected at the one receiving terminal. The connection state of the optical fiber is determined based on a detection result of the optical power of the test signal. | 03-26-2015 |
20150093106 | CONNECTION MAPPING IN DISTRIBUTED COMMUNICATION SYSTEMS - Power management techniques in distributed communication systems are disclosed. Related components, systems, and methods are also disclosed. In embodiments disclosed herein, the power available at a remote unit (RU) is measured and compared to the power requirements of the RU. In an exemplary embodiment, voltage and current is measured for two dummy loads at the RU and these values are used to solve for the output voltage of the power supply and the resistance of the wires. From at these values, a maximum power available may be calculated and compared to power requirements of the RU. | 04-02-2015 |
20150104167 | DETERMINING PROPERTIES OF AN OPTICAL COMMUNICATIONS PATH IN AN OPTICAL COMMUNICATIONS NETWORK - A method of determining properties of an optical communications path between a first optical network node (A) and a second optical network node (B) determines, at the second optical network node (B), a time difference between respective first and second optical test signals received on different wavelengths (λ | 04-16-2015 |
20150110484 | IN-SERVICE MONITORING OF A FIBEROPTIC NETWORK - An optical fiber breakage point may be located by coupling to the optical fiber an out-of-band optical test signal modulated at a periodic modulation pattern. A distance to the breakage point may be determined from a difference between modulation patterns of transmitted and received test signals. | 04-23-2015 |
20150125142 | DATA COMMUNICATION APPARATUS - The present invention relates to a data communication apparatus having at least two server communication terminals, which are connected by at least one optical cable and which each have at least one transmitter and one receiver, wherein the transmitter of a first communication terminal is connected to the receiver of a second communication terminal by a first fiber optic passage and the receiver of the first communication terminal is connected to the transmitter of the second communication terminal by a second fiber optic passage, wherein a circuit tester having an evaluation unit for evaluating test and/or error signals transmitted by the optical cable is provided for detecting damage to and/or disturbances of the optical cable. In accordance with the invention, the circuit tester is integrated into the first and/or second server, the two fiber optic passages being further connected by at least one signal diversion module. | 05-07-2015 |
20150131987 | SYSTEM AND METHOD FOR IN-BAND FREQUENCY-MODULATED SUPERVISORY SIGNALING FOR POLARIZATION-MULTIPLEXED SYSTEMS - Systems and method for monitoring a dual-polarization signal are disclosed. The systems and methods include adding a first supervisory signal to a first polarization component of the dual-polarization signal to get a first combined signal and adding a second supervisory signal to a second polarization component of the dual-polarization signal to get a second combined signal, either in the electrical or optical domain. The supervisory signals are arbitrary, non-complementary, and modulated at a frequency substantially lower than the modulation frequency of the dual-polarization signal. The systems and methods further include analyzing the supervisory signals upon receipt. | 05-14-2015 |
20150139638 | SYSTEM AND METHOD OF ESTIMATING BEAM MODE CONTENT FOR WAVEGUIDE ALIGNMENT - Alignment of a multimode waveguide to a source of light or another waveguide is evaluated using a multi-wavelength light source and a modal decomposition processing of an intensity profile of a waveguide output beam, wherein inter-modal interference is averaged out over wavelength. Fitting a superposition of mode intensity profiles to a wavelength-averaged intensity profile of the output beam provides information about the modal composition of the output beam, which may be used to assess the alignment of the multimode waveguide with respect to the input light beam, and to provide a feedback for guiding a waveguide alignment process. | 05-21-2015 |
20150318919 | METHOD OF CALCULATING TRANSMITTER AND DISPERSION PENALTY FOR PREDICTING OPTICAL DATA LINK AND SIGNAL QUALITY - A method of calculating a transmitter and dispersion penalty for predicting optical link signal quality, includes provide an optical link; capture an averaged eye, using an optical test signal sequence to drive the transmitter with the oscilloscope receiver having an oscilloscope bandwidth as available; and from the averaged eye, capturing histograms A1; capture a non-averaged eye using an optical test signal sequence to drive the transmitter, and from the non-averaged eye, capturing histograms B1; de-convolve histograms A1 from histograms B1; filter waveform from 1) convolve the filtered waveform from 4) with the estimate of the noise from 3); calculate “soft” TDP based on said probability distribution function. | 11-05-2015 |
20150326956 | ROUTING IN A WDM-BASED PON - It is disclosed a remote node connectable to multiple feeder fibers from one or more central offices, COs, of a wavelength division multiplexing-based passive optical network, WDM-based PON. The remote node comprises one or more splitters each configured to receive a monitoring signal on a connected feeder fiber and to split the monitoring signal into split monitoring signals, wherein the monitoring signal uses one wavelength at a time out of a group of different wavelengths, and an arrayed waveguide grating, AWG, with output ports connectable to drop fibers. The AWG is configured to route the split monitoring signals to output ports of said AWG based on a currently used wavelength of said group of different wavelengths, for supervising drop fibers connected to the output ports. Also, a method for a remote node in the WDM-based PON, of routing a monitoring signal, is disclosed. | 11-12-2015 |
20150365317 | Optical line protection with digital dispersion compensation module - Embodiments of present invention provide an optical signal transportation system. The system includes a first and a second optical line protection (OLP) node; a working signal transmission medium and a protection signal transmission medium between the first and second OLP nodes providing transportation paths for an optical signal from the first OLP node to the second OLP node; and at least one digital dispersion compensation module (DDCM) connected to at least one of the working and protection signal transmission media inside the second OLP node, wherein the DDCM includes a plurality of dispersion compensation units (DCUs) with each DCU being capable of providing either a positive or a negative dispersion selected by an optical switch to the optical signal, and wherein the DDCM is capable of providing the optical signal a total dispersion determined by the optical switch of each of the plurality of DCUs. | 12-17-2015 |
20150372752 | Optical Path Processing Method And Apparatus - The present invention provides an optical path processing method and apparatus. The apparatus includes an FA, an LA, an aspheric lens, a filter, and a reflector, where the FA includes a test optical channel, where the test optical channel is configured to receive test light, and enable the test light to be incident through the LA and the aspheric lens to a surface of the filter; the filter is located between the aspheric lens and the reflector, and is configured to perform transmission on the test light; and the reflector is at a distance of less than or equal to a first preset value away from a focus of light transmitted through the aspheric lens, and is configured to reflect, at a preset angle, the test light transmitted through the filter to a specular surface of the reflector. | 12-24-2015 |
20150381272 | OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION DEVICE - An optical transmission system includes: a first optical transmission device configured to transmit measurement light to an optical transmission line on a first direction; and a second optical transmission device configured, when an optical transmission characteristic is measured, to loop-back the measurement light received from the first optical transmission device through an optical transmission line on the first direction and to transmit the measurement light to the first optical transmission device through an optical transmission line on a second direction, wherein, when the optical transmission characteristic is measured, the first optical transmission device receives the measurement light loop-backed by the second optical transmission device and measures the optical transmission characteristic between the first optical transmission device and the second optical transmission device. | 12-31-2015 |
20150381273 | METHOD AND SYSTEM FOR AN OPTOELECTRONIC BUILT-IN SELF-TEST SYSTEM FOR SILICON PHOTONICS OPTICAL TRANSCEIVERS - Methods and systems for an optoelectronic built-in self-test (BIST) system for silicon photonics optical transceivers are disclosed and may include, in an optoelectronic transceiver having a transmit (Tx) path and a receive (Rx) path, where the Rx path includes a main Rx path and a BIST loopback path: generating a pseudo-random bit sequence (PRBS) signal, generating an optical signal in the Tx path by applying the PRBS signal to a modulator, communicating the optical signal to the BIST loopback path and converting to an electrical signal utilizing a photodetector, the photodetector being a replica of a photodetector in the main Rx path, and assessing the performance of the Tx and Rx paths by extracting a PRBS signal from the electrical signal. The transceiver may be a single complementary-metal oxide semiconductor (CMOS) die or in two CMOS die, where a first comprises electronic devices and a second comprises optical devices. | 12-31-2015 |
20160006503 | OTDR optical path detection device and method - The disclosure relates to an OTDR path detection device and method, and the device includes an optical input interface, an optical output interface, a test light transmission unit, an optical assembly, a test light reception unit, a data processing unit, a micro control unit, a power supply unit and a communication interface unit. In the disclosure, a detection light transmission function, a scattered light and reflected light reception function, a detected data processing function and a unit control function are integrated. A fiber optic network to be detected can be detected in real time through fixing the integral optical transmission/reception device in a fiber optic network to be detected, and the normal transmission of serving light is not affected, thus a specialized OTDR meter for fiber optic detection and related testing devices are no longer needed, thereby simplifying steps for optical fiber failure detection and lowering complexity of optical network maintenance and corresponding cost. | 01-07-2016 |
20160013860 | MULTIPLE-ACQUISITION OTDR METHOD AND DEVICE | 01-14-2016 |
20160020911 | FIBER OPTIC COMMUNICATIONS AND POWER NETWORK - A fiber optic-based communications network includes: a power insertion device, connected to multiple fiber links from a data source, configured to provide power insertion to a hybrid fiber/power cable connected to at least one fiber link of the multiple fiber links; the hybrid fiber/power cable, connecting the power insertion device to a connection interface device, configured to transmit data and power from the power insertion device to the connection interface device; and the connection interface device, configured to provide an interface for connection to an end device via a power over Ethernet (PoE)-compatible connection and to provide optical to electrical media conversion for data transmitted from the power insertion device to an end device via the hybrid fiber/power cable and the PoE-compatible connection. | 01-21-2016 |
20160028475 | CENTRALIZED AUTOMATIC BIAS CONTROL SYSTEM AND METHOD FOR MULTIPLE OPTICAL MODULATORS - A system for centralized automatic bias control for a plurality of modulators, including a coupler for coupling output of each of the plurality of modulators to generate a combined modulator output. A pilot insertion device inserts a pilot tone into each of the plurality of modulators such that a different pilot tone frequency is inserted for each of the plurality of modulators. A monitoring device iteratively monitoring power (P | 01-28-2016 |
20160056889 | OPTICAL SPATIAL-DIVISION MULTIPLEXED TRANSMISSION SYSTEM AND TRANSMISSION METHOD - The reception ( | 02-25-2016 |
20160065304 | OPTICAL CHANNEL SOUNDER - The present invention relates to an optical channel sounding transmitter apparatus, comprising an optical signal generator for generating an optical carrier signal; an optical modulator for modulating the optical carrier signal with a predetermined training sequence to obtain an modulated optical signal; a first optical transmitter for transmitting the optical carrier signal; and a second optical transmitter for transmitting the modulated optical signal. Further the present invention relates to a coherent optical channel sounding receiver apparatus, comprising a first optical receiver for receiving an optical carrier signal over a first optical channel; a second optical receiver for receiving a modulated optical signal over a second optical channel; an optical down converter for down converting the modulated optical signal using the received optical carrier signal to obtain a down converted signal; and a channel estimator for estimating a channel characteristic of the second optical channel. | 03-03-2016 |
20160099851 | METHOD AND SYSTEM FOR OPTICAL CONNECTION VALIDATION IN A RECONFIGURABLE OPTICAL ADD-DROP MULTIPLEXER (ROADM) NODE - A method of validating connections in an optical add/drop multiplexer (OADM) that includes a plurality of modules configured to route optical signals through the OADM, and at least one multi-fiber cable connecting modules of the OADM. A light source coupled to a first port of a first module is controlled to emit a test light. A determination is made whether or not the test light is received at a first photo-detector connected to a second port. Continuity of a connection between the first port and the second port is validated when the test light is received at the first photo-detector. | 04-07-2016 |
20160103168 | EMC TEST BENCH COMPRISING AN ITEM OF EQUIPMENT UNDER TEST WHICH IS INTENDED TO BE LOADED ON BOARD AN AIRCRAFT - An EMC test bench, includes an item of equipment under test to be loaded on board an aircraft, the item of equipment being subjected to EMC tests and delivering ARINC electrical interfaces as inputs and as output; an electrical interfaces device representative of an item of anti-lightning equipment and including an ARINC signals acquisition and/or generation card connected to the ARINC inputs and outputs of the item of equipment under test; a command and control rack for analyzing control signals originating from the electrical interfaces device including the ARINC signals acquisition and/or generation card, and a signals conversion system for protecting the command and control rack connected between the command and control rack and the electrical interfaces device | 04-14-2016 |
20160149639 | NON-INTRUSIVE DIAGNOSTIC PORT FOR INTER-SWITCH AND NODE LINK TESTING - A diagnostic testing utility is used to perform single link diagnostics tests including an electrical loopback test, an optical loopback test, a link traffic test, and a link distance measurement test. These diagnostics tests can be performed on trunked links and virtual channels and can be performed while QoS is enabled. Additionally the tests can be performed non-intrusively by using a dedicated VC such that regular traffic is not affected by the diagnostics testing. | 05-26-2016 |
20160187597 | PHOTOELECTRIC CONVERTER, OPTICAL COMMUNICATION SYSTEM AND ITS TEST METHOD - A photoelectric converter adapted for rectifying and converting an optical signal generated by a laser source, includes a frame and an optical coupling module mounted on the frame. The optical coupling module includes a first lens, an adjustable support including a mirror, and a second lens. The first and second lenses and the mirror define an optical path. The adjustable support includes an outer support connected to the frame and an inner support connected to the outer support by a plurality of adjustable tension springs. The mirror is rotatably mounted on the inner support by a plurality of rotating supports. Adjustment of the adjustable tension springs laterally moves the inner support to thereby adjust the lateral position of the mirror. Rotation of the rotating supports rotates the mirror. | 06-30-2016 |
20160191152 | SYSTEM AND METHOD FOR PERFORMING IN-SERVICE OPTICAL FIBER NETWORK CERTIFICATION - A system and method for performing an in-service optical time domain reflectometry test, an in-service insertion loss test, and an in-service optical frequency domain reflectometry test using a same wavelength as the network communications for point-to-point or point-to-multipoint optical fiber networks while maintaining continuity of network communications are disclosed. | 06-30-2016 |
20160191153 | Optical Module Availability Detection Method and Apparatus - A detection apparatus concurrently connected to N optical module cages by using N paths. The apparatus accesses a conflict register, acquires an occupancy status of the N paths according to a value of the conflict register, then performs a concurrent probe on M optical module cages connected to M paths that are in the N paths and whose occupancy status are not occupied by system software, to obtain a probe result, where the probe result includes availability information of optical modules of the M optical module cages and a type of the optical modules, and finally, writes the probe result into an availability register, so that the system software can acquire the probe result from the availability register. Therefore, whether an optical module is available in an optical module cage can be monitored in real time and fast insertion and removal operations on the optical module can be sensed. | 06-30-2016 |
20160191154 | IN-SERVICE MONITORING OF A FIBEROPTIC NETWORK - An optical fiber breakage point may be located by coupling to the optical fiber an out-of-band optical test signal modulated at a periodic modulation pattern. A distance to the breakage point may be determined from a difference between modulation patterns of transmitted and received test signals. | 06-30-2016 |
20160191163 | REAL-TIME FIBER OPTIC INTERFEROMETRY CONTROLLER - A modular fiber optic interferometry control system and method for extracting information from superimposed waves is disclosed. The system comprises a first module for converting a radio frequency input to a multiplexed binary data stream, a second module for correlating a pseudo random number (PRN) reference with a received PRN code modulated backscattered signal, and a third module comprising control logic. In some embodiments the system further comprises one or more of a fourth module for generating a power stream, a fifth module for event interrogation, and a sixth module for noise reduction. | 06-30-2016 |
20160255207 | REVERSE POWER SUPPLY METHOD AND REVERSE POWERING EQUIPMENT AND SYSTEM | 09-01-2016 |
20190149233 | SYSTEM, METHOD, AND DEVICE FOR MEASURING OPTICAL FIBER CHANNEL LOSS IN PHOTONIC COMMUNICATION | 05-16-2019 |
20220140894 | HIGH SPEED BIDIRECTIONAL OPTICAL TIME-DOMAIN REFLECTOMETER (OTDR)-BASED TESTING OF DEVICE UNDER TEST - In some examples, high speed bidirectional OTDR-based testing may include transmitting data from a first end of a device under test (DUT) towards an optical time-domain reflectometer (OTDR) that is operatively connected to a second opposite end of the DUT. Further data that is transmitted by the OTDR may be received from the second opposite end of the DUT towards the first end of the DUT. Based on an amplitude of the further data, a direction of receiving of the further data may be adjusted towards a first receiver or towards a second receiver. | 05-05-2022 |
20220140896 | OPTICAL TIME-DOMAIN REFLECTOMETER (OTDR) EVENT DETECTION AND LIGHT POWER LEVEL MEASUREMENT-BASED FIBER OPTIC LINK CERTIFICATION - In some examples, OTDR event detection and light power level measurement-based fiber optic link certification may include performing, at one end of a device under test (DUT) of a network, a light power level measurement. An OTDR measurement may be performed at the one end of the DUT to detect at least one event associated with the DUT. Based on analysis of the light power level measurement and the OTDR measurement, an event classification may be generated to classify the at least one event associated with the DUT. | 05-05-2022 |