Patent application number | Description | Published |
20100027581 | FLUID PHYSICAL QUANTITY MEASURING METHOD AND CONTROL METHOD - The present invention relates to a measuring method and a controlling method of measuring the physical quantity such as a fluid temperature distribution and the like by using an optical fiber sensing technique of BOCDA system. In the measuring method, an optical fiber that functions as a BOCDA-type optical fiber sensor is disposed along a flow direction of a fluid that flows though a pipe line and in the pipe line. Since the optical fiber directly contacts with the fluid that flows though the pipe line, it is possible to rapidly measure the fluid temperature distribution. Also, based on this measurement result, the controlling method adjusts each temperature of one or more heating/cooling means provided along the longitudinal direction of a pipe line, thereby controlling at high accuracy the fluid temperature distribution in the pipe line. | 02-04-2010 |
20100033711 | METHOD OF MEASURING PHYSICAL QUANTITY OF OBJECT TO BE MEASURED, AND METHOD OF CONTROLLING THE SAME - This invention relates to optical sensing technology to measure and control a physical quantity of an object that exists on or within a microstructure object, utilizing Brillouin scattering decreases. The measurement method prepares an optical waveguide one-, two- or three-dimensionally, on or within a micro-chemical chip, IC chip, or other element, and measures a physical quantity of the object on the basis of a property variation of light attributed to Brillouin scattering occurring in the optical waveguide. | 02-11-2010 |
20100040108 | METHOD FOR MEASURING TEMPERATURE DISTRIBUTION OF OBJECT, AND SENSOR UNIT - The present invention relates to a measuring method and a sensor unit of measuring temperature distribution of an object by using an optical fiber sensing technology of BOCDA system. In the measuring method, an optical fiber that functions as a BOCDA-type optical fiber sensor is disposed two-dimensionally or three-dimensionally with respect to a predetermined measurement region of the object, and thereby the temperature distribution of the object can be measured at a high speed and a high accuracy, in the predetermined measurement region configuring a surface or space where the optical fiber is disposed. | 02-18-2010 |
20100054298 | OPTICAL FIBER TEMPERATURE SENSOR - The present invention relates to an optical fiber temperature sensor capable of reducing an error in a temperature measurement. The sensor comprises an optical fiber, an optical frequency difference adjusting section, a light source system, a spectrum measuring section, a temperature calculating section, and a correcting section. The light source system outputs, into different ends of the optical fiber, probe light and pumping light of which each center frequency is set corresponding to an instruction from the optical frequency difference indicating section respectively. The temperature calculating section calculates a temperature of an object based on BGS in a first domain measured by the spectrum measuring section. On the other hand, the correcting section outputs a correction instruction to the light source system so that BGS center frequency of a second domain may be in agreement with a reference value thereof. | 03-04-2010 |
20100092127 | OPTICAL FIBER DISTRIBUTION TYPE SENSOR AND OPTICAL FIBER DISTRIBUTION TYPE DETECTING METHOD - The present invention relates to an optical fiber distribution type detecting method and the like equipped with a structure for enabling efficient measurement of a temperature distribution or strain distribution. This method regulates a modulation frequency and modulation index for probe light and pumping light opposingly incident on an object from a light source and a phase difference between the probe light and pumping light, thereby successively setting the length and location of search domains in a region to be measured. In particular, a detection process is executed while resetting the search domain length shorter at a predetermined interval of time or when an abnormality is detected. Thus partly changing the distance resolution for a specific region in the course of the detection process enables efficient measurement operations in a short time. | 04-15-2010 |
20100111486 | DISPERSION COMPENSATING MODULE - The present invention relates to a dispersion compensating module having a configuration that can effectively suppress high-speed fluctuations in the polarization state of light even when being imparted with impact or vibration. In the dispersion compensating module, a dispersion compensating optical fiber is fixed while being wound around the barrel of a bobbin, and the bobbin is fixed in the inside of a housing via a buffer that absorbs impact or vibration. The bobbin corresponds to a holder holding the dispersion compensating optical fiber fixed in a state of coil. The housing corresponds to a struct fixing the holder. The buffer fills a space between the housing and the bobbin on which the dispersion compensating optical fiber is coiled. | 05-06-2010 |
20100183272 | OPTICAL FIBER - The present invention relates to an optical fiber having a structure to enable both prevention of resin coating combustion due to leaked light, and low-loss light transmission. The optical fiber comprises a core region, and a cladding region. The cladding region is constituted by an optical cladding which affects the transmission characteristics of light propagating in the core region, and a physical cladding which does not affect the transmission characteristics of light propagating in the core region. Particularly, a leakage reduction portion is provided in the physical cladding so as to surround an outer periphery of the core region through the optical cladding. The leakage reduction portion functions to suppress propagation of the leaked light propagating from the core region toward outside the cladding region. | 07-22-2010 |
20100195965 | OPTICAL COMMUNICATION SYSTEM AND ARRANGEMENT CONVERTER - The present invention relates to an optical communication system or the like, which comprises a multicore fiber with a plurality of cores that are two-dimensionally arrayed in a cross-section thereof. In the optical communication system, an arrangement converter, provided between a multicore fiber and an Optical Line Terminal (OLT) having light emitting areas arrayed one-dimensionally, comprises first and second end faces, and a plurality of optical waveguides. The optical waveguides are disposed such that one of the end faces coincides with the first end face and the other end face coincides with the second end face. In particular, the optical waveguide end face array on the first end face and the optical waveguide end face array on the second face are different, contributing to an optical link between network resources of different types. | 08-05-2010 |
20100238427 | OPTICAL FIBER FEATURE DISTRIBUTION SENSOR - The present invention relates to an optical fiber characteristic distribution sensor comprising a structure to effectively reduce the measurement errors of position in the temperature distribution measurement etc. The sensor comprises an optical fiber section, part of which is installed in an object to be measured and to which probe light and pumping light are inputted in opposite directions. The optical fiber section includes a marker portion where data relating to the shape of a BGS in the maker has been preliminarily measured in a state where the optical fiber section is installed in a normal state. At the time of calculating the characteristic distribution in the longitudinal direction of the optical fiber section while measuring the data relating to the BGS shape, the errors of the calculated gain occurrence position are corrected, for example, by shifting the scanning range of phase difference between the probe light and the pumping light. The amount of shift of the scanning range of phase difference is given based on a difference value between the phase difference at the time of measurement when the BGS that reflects the gain that has occurred in the marker portion is measured, and the reference phase difference when data relating to the already known shape of the BGS in the marker portion has been preliminarily measured. | 09-23-2010 |
20110044700 | OPTICAL COMMUNICATIONS SYSTEM - The present invention relates to an optical communications system that allows improving OSNR while suppressing the power increase of pumping light for distributed Raman amplification. In the optical communications system, an optical fiber is laid in a transmission section between a transmitter station (or repeater station) and a receiver station (or repeater station), and optical signals are transmitted from the transmitter station to the receiver station via the optical fiber. In the optical communications system, pumping light for Raman amplification, outputted by a pumping light source provided in the receiver station, is fed into the optical fiber via an optical coupler, and the optical signals are distributed-Raman-amplified in the optical fiber. The transmission loss and the effective area of the optical fiber satisfy, at the wavelength of 1550 nm, a predetermined relationship. | 02-24-2011 |
20110080590 | METHOD OF MANUFACTURING PREFORM FOR OPTICAL WAVEGUIDE - The present invention relates to an optical waveguide manufacturing method, which excels in mass productivity of a planar optical waveguide. In an aggregating step, plural members ( | 04-07-2011 |
20110100428 | PHOTOELECTRIC CONVERSION UNIT - A photoelectric conversion unit in which efficiency of optical coupling and stability of mechanical coupling improve is obtained. | 05-05-2011 |
20110206330 | MULTICORE OPTICAL FIBER - The present invention relates to a multicore optical fiber having a structure for effectively inhibiting polarization mode dispersion from increasing, and the multicore optical fiber comprises a plurality of multicore units and a cladding region integrally covering the plurality of multicore units while separating the multicore units from each other. Each of the plurality of multicore units includes a plurality of core regions arranged such as to construct a predetermined core arrangement structure on a cross section orthogonal to an axis. The core arrangement structure of each multicore unit on the cross section has such a rotational symmetry as to coincide with the unrotated core arrangement structure at least three times while rotating by 360° about a center of the multicore unit, thereby reducing the structural asymmetry of each multicore unit. This lowers the structural birefringence in each multicore unit, thereby inhibiting the polarization mode dispersion from increasing in the multicore optical fiber. | 08-25-2011 |
20110211789 | PHASE PLATE AND PHASE PLATE MANUFACTURING METHOD - The invention relates to a phase plate which is easy to manufacture such as to have a desirable characteristic and the like. The phase plate ( | 09-01-2011 |
20110222828 | MULTI-CORE OPTICAL FIBER - The present invention relates to a multi-core optical fiber having a structure for reducing transmission loss and nonlinearity. The multi-core optical fiber comprises plural cores extending along a center axis direction, and a cladding surrounding the peripheries of the plural cores. The cladding is comprised of silica glass doped with fluorine, and each of the plural cores is comprised of silica glass doped with chlorine or pure silica glass. | 09-15-2011 |
20110235983 | OPTICAL FIBER CABLE - The present invention relates to an optical fiber cable incorporating a multi-core fiber provided with a plurality of cores and a cladding region. The optical fiber cable has a jacket covering the multi-core fiber. The multi-core fiber is arranged so that a hold wrap holds the cores in a state in which they are provided with a bend of not more than a fixed radius of curvature, in order to reduce crosstalk between the cores. | 09-29-2011 |
20110249940 | OPTICAL BRANCHING DEVICE AND OPTICAL COMMUNICATION SYSTEM INCLUDING THE SAME - The present invention provides an optical branching device and an optical communication system which are easy to connect with optical fibers. In the optical branching device, when light emitted from an optical fiber in a front stage is incident on an entrance port of a multicore optical fiber, the light propagates through a first core and then is distributed from the first core to four second cores by core-to-core crosstalk between the first and second cores. The light beams distributed to the four second cores propagate through the respective cores and are emitted to four optical waveguides optically coupled core-to-core thereto within a fan-out part at exit ports. | 10-13-2011 |
20110262749 | THERMAL INSULATOR, THERMAL INSULATING COMPONENT, METHOD OF MANUFACTURING THERMAL INSULATING SMALL FIBER AND METHOD OF MANUFACTURING THERMAL INSULATOR - The present invention enables easy manufacturing of a thermal insulating fine fiber and the like, for example, having a high degree of freedom in size and shape and excellent thermal insulating properties. In a manufacturing method according to the present invention, a first end of a preform constituted by bundling a plurality of pipes | 10-27-2011 |
20110280532 | Optical fiber manufacturing method and optical fiber - The present invention relates to, for example, a method of easily manufacturing an optical fiber having any refractive index profile with fewer kinds of rods, and an optical fiber is manufactured by preparing a plurality of rods including at least two kinds of rods having different refractive indexes from each other, bundling rods selected from the plurality of rods to construct two or more rod units, producing a preform including a region in which the two or more rod units are combined so as to have a cross-sectional shape having rotational symmetry of order 2 or more, and manufacturing an optical fiber by drawing the preform. | 11-17-2011 |
20120148258 | OPTICAL COMMUNICATIONS SYSTEM - The present invention relates to an optical communications system that allows improving OSNR while suppressing the power increase of pumping light for distributed Raman amplification. In the optical communications system, an optical fiber is laid in a transmission section between a transmitter station (or repeater station) and a receiver station (or repeater station), and optical signals are transmitted from the transmitter station to the receiver station via the optical fiber. In the optical communications system, pumping light for Raman amplification, outputted by a pumping light source provided in the receiver station, is fed into the optical fiber via an optical coupler, and the optical signals are distributed-Raman-amplified in the optical fiber. The transmission loss and the effective area of the optical fiber satisfy, at the wavelength of 1550 nm, a predetermined relationship. | 06-14-2012 |
20120168017 | LIQUID CONVEYING PIPE AND LIQUID CONVEYING DEVICE INCLUDING THE SAME - The present invention relates to a liquid conveying device and the like having a structure which liquid conveying can be performed to a sufficient height, while requiring no energy for liquid conveying and having a high degree of freedom of arrangement. The liquid conveying device | 07-05-2012 |
20130074551 | METHOD OF MAKING MULTI-CORE OPTICAL FIBER AND METHOD OF MAKING MULTI-CORE OPTICAL FIBER CONNECTOR - The present invention, even in the case where the size of a preform itself is increased, enables production of a multi-core optical fiber in which cores are arranged with high accuracy. A plurality of core members each being rod-like are fixed by an array fixing member while a relative positional relation of the plurality of core members is fixed, and the plurality of core members and a cladding member are integrated into one piece, and thus a preform is obtained. By drawing the obtained preform, a multi-core optical fiber in which core arrangement is controlled with high accuracy is obtained. | 03-28-2013 |
20130108206 | POLARIZATION MAINTAINING MULTI-CORE OPTICAL FIBER | 05-02-2013 |
20130129292 | BI-DIRECTIONAL OPTICAL COMMUNICATION METHOD AND MULTI-CORE OPTICAL FIBER - The present invention relates to a multi-core optical fiber applicable to an optical transmission line of bi-directional optical communication and a bi-directional optical communication method. The multi-core optical fiber has plural cores in a common cladding. Signal light is transmitted in a first direction through an arbitrary core among the cores, whereas the signal light is transmitted in a second direction opposite to a first direction, through all the nearest-neighbor cores to the arbitrary core. | 05-23-2013 |
20130136410 | MULTI-CORE OPTICAL FIBER - The present invention relates to a multi-core optical fiber having a structure to effectively reduce crosstalk between adjacent core regions among a plurality of core regions. The multi-core optical fiber ( | 05-30-2013 |
20130142487 | MULTI-CORE OPTICAL FIBER INTERCONNECTION STRUCTURE AND METHOD FOR MANUFACTURING MULTI-CORE OPTICAL FIBER INTERCONNECTION STRUCTURE - A multi-core optical fiber interconnection structure has a first multi-core optical fiber with a slanted end face and a second multi-core optical fiber with a slanted end face. In a state in which the slanted end faces face each other, each of cores of the first multi-core optical fiber is optically coupled to a corresponding one of cores of the second multi-core optical fiber in a one-to-one correspondence relation. The facing condition between the slanted end faces is adjusted so as to minimize variation in core pitches of pairs of the cores each in the one-to-one correspondence relation. | 06-06-2013 |
20130223795 | OPTICAL COUPLING ELEMENT AND MANUFACTURING METHOD - The present invention relates to an optical coupling element to optically couple optical elements of different kinds to each other, which is provided with a plurality of cores. In the optical coupling element a first end and a second end opposed thereto are different in at least either of a core array and a core interval. The optical coupling element has a bent shape of at least a part of the optical coupling element itself including the cores, so that a light input/output direction at the first end is different from a light input/output direction at the second end. | 08-29-2013 |
20130271771 | INTERFERENCE MEASUREMENT DEVICE - The present invention relates to an interference measurement device comprising a multi-core optical fiber having first and second ends, a light source, an optical receiver, a branching unit, a coupling unit, a measurement optical path, and a reference optical path and measures a physical quantity of an object to be measured on the measurement optical path. The light source and optical receiver are arranged on the first end side, while the measurement optical path and reference optical path are arranged on the second end side. The branching unit splits light from the light source into measurement light and reference light, while the coupling unit generates interference light between the measurement light having propagated through the measurement optical path and the reference light having propagated through the reference optical path. The optical receiver detects the intensity of the interference light. | 10-17-2013 |
20130287347 | MULTI-CORE FIBER - There is provided a multi-core fiber that can reduce both skew and crosstalk between cores. The multi-core fiber includes a plurality of cores extending along a fiber axis, and optical claddings surrounding the plurality of cores. The skew between optical signals propagating through the plurality of cores is 1 ps/m or less, and the propagation constant difference between two adjacent cores of the plurality of cores is more than 0. | 10-31-2013 |
20140153882 | OPTICAL FIBER CABLE - The present invention relates to an optical fiber cable incorporating a multi-core fiber provided with a plurality of cores and a cladding region. The optical fiber cable has a jacket covering the multi-core fiber. The multi-core fiber is arranged so that a hold wrap holds the cores in a state in which they are provided with a bend of not more than a fixed radius of curvature, in order to reduce crosstalk between the cores. | 06-05-2014 |
20150016791 | MULTI-CORE OPTICAL FIBER TAPE - A multi-core optical fiber ribbon easily optically connected to another optical component is provided. A multi-core optical fiber ribbon | 01-15-2015 |
20150016795 | OPTICAL COMPONENT AND OPTICAL COMMUNICATION SYSTEM - An optical component according to an embodiment of the present invention is constructed of a plurality of MCFs each having the same core constellation structure and among the plurality of MCFs, a maximum deviation of a core pitch between neighboring cores and a maximum deviation of a spot size of a fundamental mode at an operating wavelength satisfy a specific relation, thereby suppressing structural variation so as to keep a splice loss not more than 1 dB. | 01-15-2015 |