476results about "Testing fibre optics/optical waveguide devices" patented technology

The invention discloses an optical fiber multi-parameter testing device and method, and aims to realize integrated and efficient testing of optical fiber mode field diameter, attenuation, cut-off wavelength, macrobend loss and geometric parameters. The device comprises a three-dimensional adjusting frame, an image acquisition system, a photoelectric detection system, a light path switching device, an environment compensation module and a control unit, through optical path switching, rapid switching between an image channel and a detection channel can be realized, and full-parameter testing can be completed through one-time focusing of an end face; an objective lens with a large numerical aperture and a long working distance and an auxiliary convergent lens with NA = 0.5 are adopted, so that the mode field measurement precision is improved; the control system coordinates operation of all the modules and performs environment compensation and data processing; the scheme has the advantages of compact structure, quick test, stable result and the like, and is suitable for application scenes of optical fiber manufacturing, quality detection and the like.

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.

The invention provides a system and a method for detecting geometric parameters of an optical fiber with a longitudinal periodic structure. The system comprises an optical fiber clamp used for fixing a test part of the optical fiber to be detected in optical fiber refractive index matching oil in a space image imaging device; the light source is used for emitting test light to the collecting lens through the optical fiber bundle, and the test light is focused into a focused light spot through the collecting lens and then is sequentially emitted to the space image imaging device and the detection device; the space image imaging device is used for moving along the axis direction of the to-be-tested optical fiber based on a preset moving speed after the test light passes through a test part in the optical fiber refractive index matching oil so as to form an optical imaging signal corresponding to the test part; and the detection device is used for acquiring geometric parameters of the periodic structure in the to-be-detected optical fiber according to the optical imaging signal. According to the invention, the detection device can accurately obtain the periodic structure geometric parameters of the to-be-detected optical fiber, and the detection precision and reliability are improved.

The present invention relates to an AR diffractive optical waveguide rainbow pattern testing device, which includes a Z-axis hollow rotary table, an A-axis rotary displacement table, a hollow waveguide carrier stage, an imaging brightness and chromaticity meter, and an optical generation module. By simulating the usage scenario of the diffractive optical waveguide in a hemispherical space, the present invention acquires and analyzes multi-dimensional information such as the brightness and chromaticity, azimuth angle, solid angle, and position of the rainbow pattern, and has the ability of calibration, achieving the effects of multi-dimensional and high-precision detection and analysis of the rainbow pattern and improving the repeated measurement accuracy.

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 present disclosure provides a mode control system and method for controlling an output mode of a broadband light source including a photonic crystal fiber (PCF). The mode control system includes: at least one detection unit configured to measure one or more parameters of radiation emitted from a broadband light source to generate measurement data; and a processing unit configured to evaluate the mode purity of the radiation emitted from the broadband light source from the measurement data. Based on the evaluation, the mode control system is configured to generate a control signal for optimizing one or more pump coupling conditions of the broadband light source. The pump coupling condition relates to the coupling of a pump laser beam with respect to an optical fiber core of the photonic crystal fiber.

The invention relates to an optical fiber power 24-path synchronous measurement method and system based on leakage light, and belongs to the technical field of optical fiber communication monitoring. The method comprises the steps that bending force is applied to a to-be-measured optical fiber through a micro-bend clamping coupler, and a leakage light signal is captured through a V-shaped angle positioning structure and a double-photosensitive sensor; and high-precision conversion and amplification of optical-electric signals are realized by combining 24 paths of parallel InGaAs-PIN photodiode arrays and a high-speed logarithmic amplifier. 24 paths of signals are synchronously acquired through an SPI protocol by adopting a master-slave single-chip microcomputer architecture, data processing is performed by combining a moving average filtering algorithm and a voltage-optical power conversion algorithm, and finally real-time monitoring of multi-channel optical power is realized through a data transmission interface. The device supports modular design, has the advantages of being non-invasive, low in additional loss, short in response time and the like, and is suitable for multi-channel online monitoring and maintenance of an optical fiber communication network.

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.

A method determines a position of a light wave guiding core body of an optical waveguide for machining on a numerically controlled machine tool. The waveguide includes the core body and a shell body enclosing it, both extending from a first end face to a second end face of the waveguide. The method includes providing an optical measurement system, including a light source device and a detection device, and measuring the first end face by the optical measurement system, including irradiating the waveguide by the light source, detecting radiation emitted by the first end face, and determining a position of a center point of the core body on the first end face based on the detected radiation. The optical measurement system is arranged on the machine tool. The measurement of the first end face is performed on the waveguide clamped on the machine table by the optical measurement system.

The invention relates to the technical field of optical fibers, and provides a device and method for measuring size structure parameters of a hollow-core optical fiber, and the device comprises a light source transmitting end (11), an optical circulator (12), a spectrometer (13), and a rotary displacement platform (14). The light source emitting end (11) is connected with a first port (1) of the optical circulator (12), a second port (2) of the optical circulator (12) is aligned with the side surface of a to-be-detected hollow-core optical fiber (15) of which a coating layer is stripped, the to-be-detected hollow-core optical fiber (15) of which the coating layer is stripped is arranged in the rotary displacement table (14), and a third port (3) of the optical circulator (12) is connected with the spectrograph (13); the to-be-tested hollow-core optical fiber (15) is a band-gap hollow-core optical fiber or an N-layer nested anti-resonance hollow-core optical fiber, and N is a positive integer; the detection device is simple in composition, and the detection method is convenient to operate, simple in calculation and good in measurement accuracy.

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.

Present disclosure relates to field of semiconductor manufacturing, provides photonic integrated chip, array and testing method thereof. Chip includes functional assembly, light test assembly and electric test assembly manufactured through semiconductor process. Light test assembly and electric test assembly are connected respectively to different sides of functional assembly; functional assembly includes N functional units, and N is positive integer; each functional unit includes optical interface and first pad; first pad is configured to input or output electric signal in working environment; light test assembly includes main beam port and light splitting unit; input end of light splitting unit connects with main beam port; a plurality of output ends of light splitting unit connect with optical interfaces of N functional units; electric test assembly connects electrically with first pads, configured to test electrical performance of N functional units. Chip is configured to improve photoelectric test efficiency during wafer test.

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.

The invention provides an optical fiber defect detection system and method, and the system comprises an optical fiber fixing groove which is used for fixing the two ends of a to-be-detected optical fiber after the to-be-detected optical fiber passes through refractive index matching oil in an optical amplification device; the broadband light source is arranged on the light inlet side of the optical amplification device and is used for emitting detection light to the optical amplification device; the visible light source is connected with one end of the to-be-measured fiber and used for emitting visible light to the to-be-measured fiber; the optical amplification device is used for moving along the axis direction of the optical fiber to be detected and amplifying the detection light; after the detection light passes through the refractive index matching oil in the optical amplification device, the detection light is emitted to the optical imaging device from the light emitting side of the optical amplification device; and the optical imaging device is used for generating a corresponding optical imaging result according to the detection light emitted by the light emitting side of the optical amplification device and the visible light passing through the to-be-detected optical fiber so as to obtain defect detection information of the to-be-detected optical fiber. According to the invention, the accuracy and efficiency of optical fiber defect detection are improved.

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 invention provides a fiber winding auxiliary tooling for fiber optic macro-bending loss testing, which includes a chassis, a fiber optic guiding component, a fiber winding component, and a fiber optic clamping component; the fiber winding component includes a plurality of fiber winding circular shafts with different diameters, and the fiber winding circular shafts are vertically installed on the chassis; each fiber optic clamping component corresponds to a fiber winding circular shaft; the fiber optic clamping component includes a mounting shaft, a clamping lever, and a sponge strip, and the sponge strip can rotate towards the fiber winding circular shaft under the drive of the clamping lever and be in close contact with the fiber winding circular shaft; the fiber optic is introduced into the device through the fiber optic guiding component, and fiber optic loops with different diameters are formed by winding around the fiber winding circular shafts with different diameters, and the fiber optic clamping component exerts a clamping effect on the wound fiber optic loops; the present invention also provides an application method of the above device. The present invention can quickly complete the winding work of various fiber optics, is small in size, can be fixed on a variety of testing instruments for use, effectively improves the testing efficiency of fiber optic macro-bending loss testing, and improves the stability of the testing results.

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 invention belongs to the field of polarization maintaining optical fiber fusion splicers, and discloses an optical fiber end face detection method and system based on variance. The method comprises the steps of acquiring an optical fiber end face image, wherein the acquisition direction of a camera is perpendicular to the central axis of an optical fiber; the collected images are preprocessed; processing the preprocessed image by adopting a P parameter binarization algorithm to obtain a binarized image; performing two-dimensional modeling on the binarized image, and establishing a rectangular coordinate system by taking the length of the binarized image as an x axis and the width as a y axis to obtain a two-dimensional image matrix; performing variance calculation on the data of the x-axis coordinate value of the two-dimensional image matrix corresponding to the optical fiber end face, comparing the calculated variance value with a standard value, and judging whether the optical fiber end face is smooth or not; according to the method, an image of an optical fiber end face is collected, and the variance value of the image is calculated by using an image processing technology, so that the smoothness of the optical fiber end face is evaluated, and the optical fiber welding quality is judged. All the modules work cooperatively, and automatic detection of the optical fiber end face is achieved.

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.

To reduce time required to monitor core pairs in an optical cable.SOLUTION: An optical fiber monitor system includes: an optical fiber with a plurality of cores including pair cores (each being a pair of cores), the optical fiber being provided with more than one core pair; and a remote monitor for acquiring a monitor result showing the state of the optical fiber for each core pair by using the monitor light. The remote monitor acquires a second monitor result showing the state of a second core pair according to a first monitor result, which is the monitor result of a first core pair in the core pairs.SELECTED DRAWING: Figure 2

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.

An optical module includes an optical connector port, a plurality of variable optical attenuators, a first polarization controller, and an output port. The optical connector port connects to an optical port on a line card and receives a plurality of input optical signals from the line card when the optical connector port is connected to the optical port on the line card. The plurality of variable optical attenuators produce a plurality of attenuated optical signals based on the plurality of input optical signals. The first polarization controller produces a plurality of output optical signals based on the plurality of attenuated optical signals. The output port outputs the plurality of output optical signals.

The invention relates to a high-power fiber laser gain fiber laser test method, and belongs to the technical field of fiber lasers. The test method comprises the following steps: step 1, winding a to-be-tested gain optical fiber on a water cooling plate, and leaving two ends of the gain optical fiber; 2, stripping two passive optical fiber ends reserved on a laser, and outer cladding layers and coating layers on two end heads of a gain optical fiber to be measured; 3, the passive optical fiber core and the inner cladding are respectively welded with the gain optical fiber core and the inner cladding to form a welded optical fiber; 4, mixing and stirring the low-refractive-index AB glue to form AB mixed glue, and eliminating bubbles in the AB mixed glue; and step 5, pouring the AB mixed glue into a welding groove on the welding disc after bubble elimination, fixing the welding optical fiber on the welding disc, and arranging a welding point on the welding optical fiber in the welding groove. The device is convenient to operate, improves the test efficiency, reduces the test cost, improves the water cooling effect, and reduces the danger caused by the explosion point of the optical fiber fusion point.