314results about "Testing fibre optics/optical waveguide devices" patented technology

The invention relates to the technical field of optical parameter measurement, in particular to an optical fiber nonlinear refractive index measurement method and system based on a narrow linewidth signal, and the method comprises the steps: obtaining the initial length of an optical fiber and the wavelength parameter and a plurality of power values of a laser group connected with a to-be-measured optical fiber, and calculating the effective length value of the optical fiber based on the initial length; main peak power and side peak power corresponding to the multiple power values are obtained, the power ratio of the main peak power and the side peak power is calculated, the power ratio is input into a calculation model for inversion calculation to obtain the corresponding target phase shift amount, and the power values and the corresponding phase shift amount are fitted to determine intermediate parameters; and calculating the nonlinear refractive index of the optical fiber by combining the intermediate parameter, the wavelength parameter and the effective length value. The technical problems that in the prior art, the calculation process is complex and is easily interfered by the dispersion effect, and the nonlinear effect intensity is unstable, so that the accuracy of the nonlinear refractive index of the optical fiber is low are solved. The method has the effects of reducing the calculation complexity of the nonlinear refractive index of the optical fiber and improving the accuracy at the same time.

A method of inspecting a Fiber Array Unit (FAU) in a co-packaged optics application using an inspection apparatus, includes: Positioning the FAU in the apparatus. Utilizing a high-resolution CCD imaging system to capture detailed images of the FAU. Employing an IR CCD to assess the core pitch position of the FAU. Measuring the quality of output beams from the FAU's optical fibers using a beam profiler. Actively aligning the FAU using left and right 6-axis alignment units.

The invention relates to the technical field of optical fiber sensing, in particular to a DAS-based sound source event positioning method and system and electronic equipment, and the method comprises the steps: obtaining an audio feature image according to an abnormal sound source signal collected by a DAS; performing feature extraction on the audio feature image to obtain an audio feature vector; acquiring an event feature vector according to the audio feature vector, and identifying an abnormal sound source event according to the event feature vector; and performing feature splicing on the event feature vector and the audio feature vector to obtain a spliced feature vector, and processing the spliced feature vector to obtain a sound source distance. Compared with the prior art, the task of predicting the abnormal sound source event and the sound source distance is executed in parallel based on the audio feature vector, and then identification and location positioning of the optical cable abnormal sound source event are achieved at the same time.

The invention discloses a non-destructive and high-precision testing and calibrating device and method for internal geometric parameters of a multi-core optical fiber. The device comprises a two-dimensional arc groove testing mold, a first rotating clamp, a second rotating clamp, a fan-in and fan-out device, an optical switch, an optical frequency domain reflectometer and data collecting and processing equipment. By embedding the to-be-measured multi-core optical fiber into the groove with the known curvature and combining the distributed strain demodulation technology, the distributed strain distribution in the bending state is directly measured, and the distributed strain distribution in the bending state is directly measured through a mathematical model of the bending-torsion composite action and a cosine function fitting algorithm without cutting or damaging the optical fiber structure. And synchronously calculating the torsion period, the core spacing and the core included angle. The method overcomes the defects that a traditional microscope method depends on end face preparation and destructive detection, realizes on-line measurement of all-fiber length, can adapt to multi-core fibers with different core numbers and cladding structures, and can be expanded to high-precision industrial scenes such as fiber-optic gyroscope calibration, flexible conduit morphology monitoring, submarine optical cable process optimization and the like.

The invention provides a power distribution network optical fiber fault positioning method and system based on time domain reflection, and relates to the technical field of power distribution networks, and the method comprises the steps: obtaining the basic parameter information of an optical fiber, generating and carrying out the phase modulation of an optical carrier signal, dividing the modulated signal into a chip sequence, and carrying out the orthogonal coding and time domain interleaving modulation; an enhanced detection signal with a space-time diversity characteristic is formed; signals are injected into the optical fiber, reflected signals are received, fault feature fingerprint information is extracted through multi-scale wavelet transform and adaptive threshold screening, fault type recognition and accurate position positioning are achieved, and fault detection accuracy and positioning precision are effectively improved.

The invention belongs to the field of monitoring and early warning of submarine optical cables, and particularly relates to a submarine optical cable monitoring and early warning method and system based on data analysis. The method comprises the following steps: obtaining state feature vectors by using a historical signal of each sensing unit and a monitoring signal of an adjacent sensing unit, and initializing each state feature vector into an atomic cluster; the fusion distance between any two atomic clusters is calculated, the combination priority of the two atomic clusters is determined based on the fusion distance and the topological proximity factor, the two atomic clusters with the highest priority are combined repeatedly, and combination is stopped when set conditions are met; and in any new cluster formed after the merging is terminated, if the static anomaly score of the cluster and the dynamic curvature of the mass center motion trail of the cluster exceed respective threshold values, judging that the new cluster is an abnormal event and generating an early warning. According to the invention, early warning can be carried out on physical disturbance generated by various external factors which may cause interruption of the submarine optical cable more accurately and reliably.

The modular housing case includes a fiber optic component housing defined as a cavity and or cavities that are sized to receive a fiber optic connector and or connectors. Within the cavity or cavities is a ferrule guide or ferrule guides. The module housing case also has an internal cavity that is at least partially enclosed. Those components can range from a lighting system powered by internal electronics or a system that relies on the cell phone camera flash and or flashlight LED for internal fiber end face lighting. The module housing case has a camera lens alignment feature manually adjustable to increase magnification of the field of view.

The invention relates to the technical field of optical signal transmission, in particular to an optical fiber polarization measurement system and method. The optical fiber polarization measurement system comprises a light source which is located at the light incident side of a to-be-measured optical fiber and is used for inputting detection laser to the to-be-measured optical fiber; the optical fiber temperature control assembly is circumferentially arranged along the periphery of the to-be-measured optical fiber and is used for adjusting the temperature of the to-be-measured optical fiber; the light-emitting optical fiber is the same as the optical fiber to be detected in model and is welded with the output end of the optical fiber to be detected through polarization-maintaining welding; the heat preservation rotating assembly is arranged close to the output end of the light-emitting optical fiber and used for providing a constant-temperature environment for the light-emitting optical fiber and driving the light-emitting optical fiber to rotate concentrically. The polarization analyzing assembly is located at the output end of the light-emitting optical fiber and used for screening the output laser output by the light-emitting optical fiber based on the polarization direction; the photoelectric detection assembly is located on the side, away from the light outlet optical fiber, of the polarization detection assembly and used for detecting the optical power of the polarized laser screened by the polarization detection assembly. The measuring efficiency can be effectively improved, the cost is reduced, and the structure is simplified.

A visual inspection device and apparatus is disclosed for inspecting fiber ends of a connector by capturing an image of the connector end face, and implementing an image analysis tool for detecting contamination from the captured image. The visual inspection tool includes components for providing a larger field of view to capture the entire connector end face in a single image, and the image analysis tool is able to accurately and efficiently detect contamination from the captured image.

An optical circuit board includes a wiring board and first and second optical waveguides positioned on the wiring board. The first optical waveguide includes a first lower clad, a first core, and a first upper clad covering at least part of the first core. The second optical waveguide-includes a second lower clad, a second core, and a second upper clad covering at least part of the second core. The second optical waveguide includes a first end surface at which a first core end surface of the second core is exposed on an outer edge side of the wiring board and includes a second end surface at which a second core end surface of the second core is exposed on a center side of the wiring board. At the first end surface and / or the second end surface, a gap is between the second core and the second upper clad.

The invention relates to the technical field of metasurface gratings, and discloses a synchronous testing system and method for diffraction efficiency and field angle of metasurface grating waveguide, and the system comprises a light source module which responds to a preset target field angle range, encodes the phase and frequency of a light beam through a composite encoding method, and obtains an incident light beam; the diffraction module is used for dividing the metasurface grating waveguide into a plurality of sub-regions, respectively inputting an incident light beam into each sub-region for diffraction, and collecting a diffracted light beam diffracted by the metasurface grating waveguide in each sub-region; the parameter coupling module is used for performing coupling calculation on a plurality of parameters in the diffracted beams of each sub-region through a parameter coupling method to generate a coupling matrix; the decoupling analysis module decouples the coupling matrix through a preset parameter decoupling model to obtain the diffraction efficiency and the field angle of the metasurface grating waveguide; according to the invention, high-precision synchronous measurement of the diffraction efficiency and the field angle of the metasurface grating waveguide can be realized.

According to examples, an apparatus may include an optical system to capture images of a DUT when the DUT is positioned in a removable DUT adapter plate for inspection in the apparatus. The apparatus may also include a mounting tray having an opening, in which the mounting tray is to support the removable DUT adapter plate, the removable DUT adapter plate includes an identification code positioned on the removable DUT adapter plate, and the optical system is to capture an image of the identification code through the opening in the mounting tray. The apparatus may further include a controller to receive the image of the identification code from the optical system, decode information included in the identification code, and set at least one of a lighting profile, an inspection profile, and pass / fail parameters of the optical system to be used in inspecting the DUT based on the decoded information.

A structural component includes a mounting element configured to mount the structural component to an adapter component of a fiber inspection device; a first engagement part of a first holding element that is configured to contact a first surface of a fiber device; and a second engagement part of a second holding element that is configured to contact a second surface of the fiber device. The first engagement part and the second engagement part are further configured to receive the fiber device in a particular orientation to cause the first engagement part to contact the first surface of the fiber device and the second engagement part to contact the second surface of the fiber device, and hold the fiber device in a particular position and in the particular orientation. Accordingly, the structural component enables coupling of a connector of the fiber device and a connector of the adapter component.

Provided herein is a solution for measuring the optical power loss of duplex optical-fiber devices under test, and particularly those terminated with a duplex connector interface, which allows for a one-cord testing method whichever the format of the duplex connector interface of the optical-fiber device under test, without disconnecting the optical fibers of the device under test from their duplex native connector interface. Provided is an optical-fiber expansion device used to interconnect and adapt a power meter instrument to a variety of duplex connectors. The optical-fiber expansion device comprises a pair of optical fibers having a core diameter and a numerical aperture greater than the optical fiber in the DUT connector interface, to make it compatible with the one-cord testing method. Interchangeable optical-fiber expansion devices can be used to match the power meter interface on one side, to various duplex connector interfaces under test on the other side.

The present disclosure is a light reflection measurement device including: a first light source for outputting first continuous light; a second light source for outputting second continuous light as local light; and a signal processing unit for performing digital signal processing on a light reception signal I(t) obtained by multiplexing reflected light that is obtained by irradiating a measurement target with one branched light of the first continuous light, reference light that is the other branched light of the first continuous light, and the local light, in which the signal processing unit calculates an autocorrelation function between the light reception signal I (t) and a light reception signal I (t+τ) obtained by shifting the light reception signal by time τ, and measures reflection on the measurement target by using a position of a peak of the autocorrelation function.

The purpose of the present disclosure is to provide a technology that simplifies the measurement of reflection at any position in the light propagation direction of a measurement object by omitting the adjustment of a precise optical system, and expands the measurable distance range.　The present disclosure is a light reflection measuring device comprising: a first light source that outputs first continuous light; a second light source that outputs second continuous light as local light; and a signal processing unit that performs digital signal processing on a received light signal I(t) obtained from combined light of reflected light obtained by irradiating the measurement object with one branch of the first continuous light, reference light that is the other branch of the first continuous light, and the local light, wherein the signal processing unit calculates an autocorrelation function between the received light signal I(t) and a received light signal I(t+τ) obtained by shifting the received light signal by time τ, and measures the reflection at the measurement object by using the position of the peak of the autocorrelation function.

The present invention relates to an optical coupling module (105) for testing an element (135) to be tested, the optical coupling module (105) comprising a module carrier (107) having a test-signal portion (110) for emitting an optical test signal (125) to a coupling region (130) of the element (135) to be tested or for receiving an optical test signal (125) from the coupling region (130) of the element (135) to be tested, and a camera system (140) fixed to the module carrier (107) for identifying the position of the coupling region (130) of the element (135) to be tested in relation to the module carrier (105).

A method for measuring a twist of an optical fiber is a method for measuring the twist of an optical fiber being drawn. The method includes irradiating the optical fiber with light beams from a plurality of irradiation positions spaced apart along a traveling direction of the optical fiber; detecting intensity distributions of the light beams, with which the optical fiber is irradiated and which are transmitted through the optical fiber, at a plurality of detection positions corresponding to the plurality of irradiation positions; and calculating the twist of the optical fiber based on the intensity distributions which are detected.

An all-optical-fiber device (optionally produced with the use of laser machining) containing constituent optical fiber components in which the corresponding ends are segmented (and—in one specific case—quartered) and optionally tapered (while portions of the original cores and claddings are maintained) and operationally joined back to form an aggregate end of the device with the round aperture and the corresponding round facet. The end of the device may be cooperated with a quadrant detector for automatic guidance that is based on steering the output light, that was launched into the round facet and propagated through the device, toward the quadrant with the strongest signal in iterations until the signal in each quadrant of the detector is substantially balanced. Constituent optical fiber component(s) and overall detection system and method for manufacture and / or use of same.

The technologies described herein are generally directed to using a loopback component to test a single fiber optic strand. For example, a method described herein can include generating a first optical beam of a first wavelength. The method can further include transmitting the first optical beam via a fiber optic fiber. Further, the method can include receiving via the fiber optic fiber, a second optical beam of a second wavelength, with the second optical beam having a characteristic of the first optical beam, and with the second optical beam being generated by a non-electrical conversion of the first light of the first wavelength to the second light of the second wavelength.

The invention discloses a method and a device for determining a laser damage index of an optical fiber tunnel and electronic equipment. The method comprises the following steps: acquiring a plurality of working condition scenes corresponding to an optical fiber tunnel; determining laser temperature parameters respectively corresponding to the plurality of tunnel areas; determining transmission attenuation indexes respectively corresponding to the plurality of working condition scenes; determining a plurality of spatial distances respectively corresponding to the plurality of optical fiber devices; and according to the laser temperature parameters corresponding to the plurality of tunnel areas, the transmission attenuation indexes corresponding to the plurality of working condition scenes, and the plurality of spatial distances corresponding to the plurality of optical fiber devices, determining a laser damage index corresponding to the optical fiber tunnel. According to the method and the device, the technical problem that the laser damage index of the optical fiber tunnel is determined inaccurately when the laser damage index of the optical fiber tunnel is determined in related technologies is solved.

This invention discloses an acoustic sensing method for multispan sensing using a single-wavelength optical frequency domain reflection method. [Solution] A system and method for monitoring an optical transmission path in an optical transmission system. The optical transmission system comprises a sensing and interrogation unit and a plurality of sensing units located on the optical transmission path. An optical signal is transmitted to the plurality of sensing units to determine the state of one or more portions of the optical transmission path. A plurality of reflected signals in response to the optical signal are received. The plurality of reflected signals are converted in at least one of the frequency domain and the time domain. The state of one or more portions is determined using the converted plurality of reflected signals.

The application discloses a kind of hollow optical fiber end face geometric parameter testing device and method, the device includes: process parameter database;For storing and configuring hollow optical fiber process parameter model, and the first optical fiber end face geometric parameter is parsed to hollow optical fiber process parameter model;Test unit;For collecting the end face image of the hollow optical fiber sample to be measured;Data acquisition and processing unit;For obtaining the second optical fiber end face geometric parameter by parsing end face image, and according to the first optical fiber end face geometric parameter and the second optical fiber end face geometric parameter obtains test result.The application effectively improves the efficiency of hollow optical fiber research and development verification.

Loss measurement system in an integrated photonic circuit and associated method. The invention relates to a system (100) for measuring the absolute insertion loss ILcp ​​of a photonic circuit (20) comprising input (21) and output (22) interfaces, the system comprising a first optical fiber (1) configured to transmit the beam emitted by a light source (10) to a first connector, an injection optical fiber (2) connected to the first fiber using the first connector and configured to transmit the beam to the input interface, a collection optical fiber (3) configured to collect the beam from the output interface, a second optical fiber (4) connected to the collection fiber using a second connector and configured to transmit the beam to a detector for measuring a characterization power Pcp, the system comprising a calibration element (110) having an insertion loss ILmir,The system is configured to measure ILcp ​​insertion losses after calibration via the calibration element. Figure for the abbreviation: Fig. 1A,

The embodiment of the invention provides an optical fiber fault detection method and device, and the method comprises the steps: detecting a reference optical signal in a reference optical fiber and a to-be-detected optical signal in a to-be-detected optical fiber through an optical detector, and carrying out the coherent interference of the reference optical signal and the to-be-detected optical signal, and obtaining an interference signal; performing fast Fourier transform on the interference signal, and extracting a phase signal from a transformed frequency domain signal; measuring a group delay distribution curve based on the phase signal; fault features are detected based on the group delay distribution curve; and determining a fault type according to the fault feature and a preset fault type template. According to the invention, the detection precision and reliability of tiny damage and non-reflective faults of the optical fiber can be realized.

The invention relates to a method for estimating the ion doping concentration of a rare earth doped optical fiber, and belongs to the technical field of optical fiber amplifiers. An optical fiber to be measured is used for building an optical fiber amplifier, measurement is carried out under the condition of no signal light input, and signal light interference is avoided; reverse fitting is carried out through a simulation model, and the doping concentration is adjusted until the relative error lt is reached; 2%; taking the rare earth ion doping concentration determined in simulation as the doping concentration of the optical fiber to be measured; by measuring the change of the output spectrum of the optical fiber amplifier and comparing the change with a simulation result, the doping concentration is estimated, and the measurement period and the measurement cost are greatly reduced. The method realizes non-destructive and rapid estimation of the doping concentration, remarkably shortens the detection time through real-time measurement and simulation iteration of the spectral power ratio, is low in cost and short in test period, and can be applied to the field of optical fiber amplifier research and other application scenes.

The application provides a fiber grating mode selection characteristic testing device and method, and the output characteristic of testing light, the output characteristic of reflected light of a to-be-tested fiber grating and the output characteristic of transmitted light of the to-be-tested fiber grating are obtained by using the fiber grating mode selection characteristic testing device, the output characteristic of testing light, the output characteristic of reflected light of a to-be-tested fiber grating and the output characteristic of transmitted light of the to-be-tested fiber grating are compared and analyzed, and the mode selection characteristic of the to-be-tested fiber grating is obtained. The application quantitatively analyzes the characteristic of the fiber grating used in the fiber laser system based on a simple spatial light path, so as to provide technical support for the design of the fiber laser system.

An apparatus and a method for detecting a mounting state of a light pipe in a terminal are disclosed. The detection apparatus includes a fixture, a detection light source, and a light detection module. A light inlet path is formed inside the fixture, an opening that is of the light inlet path and that is exposed to the fixture is opposite to a mounting position of the light pipe, and the detection light source is disposed above the fixture. The light detection module is configured to determine the mounting state of the light pipe based on a luminous flux value of detection light. In cases in which the light pipe is properly mounted, the mounting position is deviated, the light pipe is not mounted, or the like, the luminous flux value of the detection light that is transmitted to the light detection module through the light inlet path varies accordingly.

An optical transmission line monitoring system according to the present disclosure includes a first optical transmission line and a first delay optical transmission line for propagating a first monitoring light, a second optical transmission line and a second delay optical transmission line for propagating a second monitoring light, and a detection unit for identifying, based on a time at which the first monitoring light is acquired via the first optical transmission line and the first delay optical transmission line and a time at which the second monitoring light is acquired via the second optical transmission line and the second delay optical transmission line, the first monitoring light as a monitoring light propagated through the first optical transmission line and the second monitoring light as a monitoring light propagated through the second optical transmission line.

An optical power distribution estimation device including: a coherent receiver that receives a signal transmitted from an optical transmission device via an optical transmission line; and an optical power distribution estimation unit that estimates an optical power distribution on a basis of at least a signal obtained by compensating for or applying a characteristic of an optical reception device to a reception signal received by the coherent receiver or a signal transmitted from the optical transmission device restored on a basis of the reception signal.