232results about "Testing fibre optics/optical waveguide devices" patented technology

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 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 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.

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.

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 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 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.

In the optical transmission medium measurement method, the optical transmission medium is subjected to a plurality of light inputs having different characteristics and equal center wavelengths, and measured values of intensity spectra of a plurality of light outputs from the optical transmission medium corresponding to the plurality of light inputs, respectively, are obtained. The nonlinear coefficient and the wavelength dispersion value are varied and an error between a calculated value of an intensity spectrum calculated based on an intensity spectrum and a phase spectrum of each of the plurality of light inputs, the nonlinear coefficient and the wavelength dispersion value of the optical transmission medium, and a measured value of an intensity spectrum of each of the plurality of light outputs is calculated. Then, a difference between the plurality of light inputs due to the difference in characteristics based on a relationship between the nonlinear coefficient and the wavelength dispersion value and the error is determined. Thus, a measurement method of obtaining the nonlinear coefficient and the wavelength dispersion value of the optical transmission medium with high accuracy is realized.

The invention discloses a device and a method for testing geometric parameters of an end face of a hollow-core optical fiber. The device comprises a process parameter database; the data storage module is used for storing and configuring a hollow-core optical fiber process parameter model and analyzing the hollow-core optical fiber process parameter model into a first optical fiber end face geometric parameter; a test unit; the image acquisition module is used for acquiring an end face image of a to-be-detected hollow-core optical fiber sample; a data acquisition and processing unit; and the testing module is used for analyzing the end face image to obtain second optical fiber end face geometric parameters and obtaining a testing result according to the first optical fiber end face geometric parameters and the second optical fiber end face geometric parameters. According to the invention, the efficiency of research and development verification of the hollow-core fiber is effectively improved.

The invention provides a device and a system for determining a state of an optical system for an endoscope. The device comprises: an input interface configured to receive image data acquired by means of the optical system; a computing device configured to implement at least one evaluation module configured to determine an entire optical flow of the obtained image data, to identify on this basis at least one image flow vector, and, if at least two different image flow vectors have been identified, to determine on this basis at least one state of the optical system; and an output interface which is configured to generate an output signal which comprises an item of information about the determined at least one state of the optical system.

A system and a method for monitoring an optical transmission path in an optical transmission system. The optical transmission system includes a sensing and interrogation unit and a plurality of sensing units positioned on the optical transmission path. An optical signal is transmitted to the plurality of sensing units for determining a status of one or more portions of an optical communication path. A plurality of reflected signals responsive to the optical signal are received. The plurality of reflected signals are transformed in at least one of: the frequency domain and the time domain. The status of one or more portions is determined using the transformed plurality of reflected signals.

The invention provides an optical path monitoring system and a control method thereof, relates to the technical field of optical communication, and aims to solve the problems of high cost, low efficiency and the like of an existing optical path monitoring mode. The optical path monitoring system comprises a controller, a plurality of measuring devices and a plurality of optical switching devices. The controller is connected with a plurality of measuring devices, the measuring devices are connected with a plurality of optical switching devices, and the optical switching devices are connected with a plurality of optical paths; the controller is used for determining a target measurement device, a target optical switching device and a to-be-measured optical channel of the target optical switching device according to the measurement task information; the controller is also used for sending a control instruction to the target optical switching device through the target measuring device, so that the target optical switching device switches the optical channel to the optical channel to be measured; the controller is also used for controlling the measuring device to send out a test signal, measuring an optical path connected with the optical channel to be measured, and obtaining measurement data; and processing the measurement data to determine the node type on the optical path, the luminous decay of the node and the position of the node on the optical path.

Embodiments of this application provide an optical cable sag identification method. The method includes: obtaining optical power data, where the optical power data is performance data of an optical module in a first collection periodicity, and the optical module is connected to an optical cable; and determining, based on the optical power data, whether optical cable sag occurs in the optical cable. In this way, whether optical cable sag occurs in an optical cable connected to the optical module is determined based on analysis of performance data of the original optical module without additionally adding various high-precision devices to additionally collect data such as images and pressure data. This provides reliable guidance about sites in which optical cable sag occurs with low costs for maintenance personnel, thereby effectively avoiding optical cable faults and optical cable accidents caused by optical cable sag.

The present application relates to the field of optical testing and calibration technology, and more particularly to a kind of multiple range measurement device and method of optical fiber device characteristics, to be measured object accesses measurement access detection module, forms circulating test optical path;Low coherence demodulation detection module generates reference light and test light, reference light returns after being scanned by reflection dynamic scanning module spatial optical path, test light enters measurement access detection module after being scanned by the module, and multiple range circulating transmission is completed with to-be-measured object, and the output of test light after transmission returns low coherence demodulation detection module after being scanned by the module again;The module interferes with the received reference light and test light, and obtains measurement result.The present application is tested by multiple range optical fiber ring test structure, integrates commonly used optical fiber and device characteristics, perfects access mode, cooperates calibration correction model, realizes multiple types, multiple parameters, high precision, high reliability and low cost test target.

This invention discloses a method and system for synchronous measurement and model optimization prediction of the length and refractive index of a single-mode optical fiber, relating to the field of optical fiber sensing technology. The method includes: S1: Performing spectral analysis on the electro-optically modulated optical signal in a Sagnac ring interference optical path, extracting a first set of concave point frequency data, and generating a first frequency interval parameter through linear fitting; S2: Connecting a standard single-mode optical fiber of known length in series in the Sagnac ring interference optical path, performing spectral analysis on the modulated optical signal, extracting a second set of concave point frequency data, and generating a second frequency interval parameter through linear fitting; S3: Calculating the length and refractive index of the single-mode optical fiber under test using a preset formula based on the difference between the first and second frequency interval parameters; S4: Adjusting the laser wavelength to obtain multiple sets of wavelength-refractive index data, constructing a Gaussian process regression model based on the data, optimizing the Sellmeier equation parameters, and generating a refractive index-wavelength prediction model. This significantly reduces the complexity of the measurement.

An inspection apparatus 1 includes a stage 10 holding a PIC 100, a PIC controller 20 controlling an operation of the PIC 100, an LRG filter 61 having a transmission characteristic in which a transmittance varies linearly in a predetermined wavelength range and configured to transmit or reflect light that has been guided by a waveguide 108 and output from at least one optical output unit 102 on the basis of the transmission characteristic, a camera 62 capturing light transmitted through the LRG filter 61 to output a transmission image and capturing light, which has arrived without passing through the LRG filter 61, to output a total light quantity image, and a computer 70 performing a first processing to derive wavelength information of the light output from the optical output unit 102 on the basis of the transmission image and the total light quantity image.