628results about "Testing fibre optics/optical waveguide devices" patented technology

The invention belongs to the technical field of roadway surrounding rock monitoring, and particularly relates to a fiber bragg grating roof separation monitoring device and method.The device comprises an anchor fluke, a shell, a rope, a sleeve, a protection box and a fiber bragg grating and further comprises a movement detection mechanism; the mobile detection mechanism comprises a winding drum, a lead screw, a base, a first magnet, a concave block, a sliding block, a fixing plate, an elastic frame, rotating teeth and a compression spring. The fiber bragg grating roof separation monitoring device solves the problem that in the monitoring process of an existing fiber bragg grating monitoring device, due to fatigue stress, loosening and falling of bonding points and damage of sensitive elements, the monitoring precision is reduced, redundant configuration of signals during monitoring is achieved, and the precision and reliability of the fiber bragg grating roof separation monitoring device are greatly improved.

The invention discloses a testing method of an underwater optical connector plugging testing device, which comprises the following steps of: injecting turbid seawater, pressurizing, adjusting the temperature of the turbid seawater, detecting the minimum plugging pressure of horizontal forward rotation, detecting the minimum plugging pressure of horizontal reverse rotation, detecting the minimum plugging pressure of forward inclination and forward rotation, and detecting the minimum plugging pressure of forward inclination and reverse rotation. And detecting the minimum plugging pressure of the reverse tilt forward rotation, and detecting the minimum plugging pressure of the reverse tilt reverse rotation. The invention relates to a test method of an underwater optical connector plugging test device, which can simulate a complex underwater environment and perform cable connection test.

Methods and systems for fiber identification include emitting a pump pulse on a fiber using a transponder. A Brillouin gain spectrum of reflected radiation from the pump pulse is measured using the transponder. A fiber type is determined corresponding to the Brillouin gain spectrum.

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.

A computer-implemented method in a processing device of an Optical Critical Dimension (OCD) metrology system includes receiving grating parameters as input to a neural network. The neural network generates an output including a predicted optical response of a grating based on the grating parameters. Responsive to determining that a difference between the predicted optical response and a measured optical response of the grating is within a specified threshold, the grating parameters are output as a predicted structure of the grating. Responsive to determining that the difference is greater than the specified threshold, the grating parameters received as input to the neural network are iteratively updated until the predicted optical response and the measured optical response converge.

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 provides an automatic measuring device and method for the diameter of an optical fiber mode field, and the device comprises a first sliding table, a light beam quality analyzer and a pedestal, and the first sliding table and the light beam quality analyzer are sequentially disposed on the pedestal. The first sliding table is used for arranging a to-be-measured optical fiber and driving the to-be-measured optical fiber to move or rotate in different directions so as to adjust the axial distance between the end face of the to-be-measured optical fiber and the light beam quality analyzer and adjust the position and ovality of a light spot emitted by the to-be-measured optical fiber on the light beam quality analyzer; light spots emitted by the to-be-measured optical fibers at different axial distance positions are accurately measured through the light beam quality analyzer, and light spot radiuses corresponding to the to-be-measured optical fibers at different axial distance positions are obtained; the mode field diameter of the to-be-measured optical fiber is obtained according to the light spot radiuses corresponding to the to-be-measured optical fiber at different axial distance positions and the corresponding axial distances, and the measurement accuracy of the mode field diameter of the to-be-measured optical fiber is improved by adjusting the light spot ovality through the first sliding table.

It is made possible to satisfactorily determine whether or not the light diameter of collimated light is within a defined range in a double mode.A light intensity distribution of collimated light including components of a fundamental mode and a first-order mode is acquired by a light intensity distribution acquisition section. A light intensity line corresponding to a predetermined light intensity lower than a maximum intensity of light intensity is acquired by a light intensity line acquisition section in reference to the light intensity distribution. The ratio of inclusion of the light intensity line in an annular region between a first circle and a second circle larger than the first circle with an optical axis of the collimated light in a center in an entire circular region centered on the optical axis of the collimated light is calculated by a ratio calculation section. Further, it is determined by a determination section whether or not the light diameter of the collimated light is within a defined range, in reference to the ratio.

A device for detecting optical loss includes a first light-guiding cable, a second light-guiding cable, a light detector, at least one angle-adjusting bracket, and a first emission microscope. The first light-guiding cable is connected with a light generator. The light detector is connected with the second light-guiding cable. When the light generator generates a light beam, the light beam is emitted to a semiconductor light-guiding chip through the first light-guiding cable. The semiconductor light-guiding chip guides the light beam to the second light-guiding cable. The light detector receives the light beam through the second light-guiding cable to retrieve the energy of the light beam. The first emission microscope captures the leakage position of the semiconductor light-guiding chip where the light beam is emitted from the semiconductor light-guiding chip.

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 coaxial self-centering tunable reflection grating diffraction performance testing device. Comprising a supporting device, a stretching device for stretching a flexible grating sample, a rotating device for coaxially changing and measuring incident and emergent angles, a light source device for fixing and adjusting an incident laser, and a receiving device for fixing and adjusting the position and orientation of a receiving screen or a camera, wherein the rotating device is connected with the light source device and the receiving device, the stretching device is fixedly arranged on the supporting device, and self-centering is achieved by adjusting the relative position. The device is compact in structure, moderate in size, simple to operate and accurate in test result. The grating is fixed and stretched by using a mechanical device, the tunability of the grating is ensured, the design of a rotating shaft can change the incident laser and the included angle between the receiving device and the grating at the same time, and the device also can change the parameters such as the incident distance, the receiving distance and the orientation. When the position of a test sample is self-centered, six-degree-of-freedom experimental test is realized, and the device has higher adaptability due to the adjustment design of different positions.

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 embodiment of the invention provides a diffractive optical waveguide test system and test method. The diffractive optical waveguide comprises a light coupling-in area, and the test system comprises a movable carrying platform which is used for carrying the diffractive optical waveguide; the first sliding rail is arranged on the outer side of the movable carrying table in a surrounding mode, a light source assembly is arranged on the first sliding rail, and the light source assembly is used for projecting first light rays to the light ray coupling-in area; the second sliding rail is arranged on the outer side of the first sliding rail in a surrounding mode, a light ray analysis component is arranged on the second sliding rail, the light ray analysis component is movably arranged on the first sliding rail, and the light ray analysis component is used for receiving second light rays and determining energy of the second light rays; and determining the light energy loss proportion of the diffraction optical waveguide according to the energy of the second light, wherein the second light is the light coupled out by the light coupling-in area.

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 optical fiber inscribing, and particularly relates to a reel-to-reel based distributed optical fiber grating inscribing device and inscribing method, and the device comprises an optical fiber transmission mechanism, a femtosecond laser optical fiber inscribing mechanism and an online monitoring mechanism; the optical fiber transmission mechanism comprises an unwinding roller, an optical fiber guide mechanism and a winding roller which are arranged in sequence, and the optical fiber guide mechanism is used for enabling an optical fiber to move in the linear direction in the inscribing area; the online monitoring mechanism comprises a light source and a spectrograph, the light source and the unwinding roller rotate synchronously and are connected with the head end of an optical fiber in the unwinding roller, and the spectrograph and the winding roller rotate synchronously and are connected with the tail end of an optical fiber in the winding roller. The light source is arranged on the unwinding roller in a synchronous rotating mode, the spectrograph is arranged on the winding roller in a synchronous rotating mode, light information is injected into the optical fiber through the light source, the spectrograph receives light signals, whether writing operation is normal or not is fed back, and then the writing state is monitored in real time.

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 tip for an optical fiber inspection device includes a body portion that includes a first opening, a second opening, and a chamber that extends within the body portion from the first opening to the second opening. The body portion is configured to allow illumination light to enter through the first opening and to propagate to, and impinge on, a portion of a surface of the chamber. The portion of the surface of the chamber is configured to redirect the illumination light to allow the illumination light to propagate to, and exit through, the second opening and thereby propagate to an angled end face of an optical fiber. The body portion is configured to allow reflection light, reflected by the angled end face of the optical fiber, to enter through the second opening and to propagate through, and exit from, the chamber.

The invention relates to the field of high-temperature sensor coupling and packaging, in particular to an integrated high-temperature optical fiber sensor coupling and packaging device and method based on laser welding. The device comprises a laser welding module, a motion control module and a signal detection module, the laser welding module is used for providing welding laser for the motion control module, so that the tail end of the optical fiber pigtail is welded and fixed with the sensing unit; the motion control module comprises a base three-dimensional displacement table, an optical fiber five-dimensional displacement table, an optical fiber clamping piece, a sensitive unit clamping piece, a rotating table and a sensitive unit three-dimensional displacement table and is used for realizing alignment and adjustment of a welding position, and the signal detection module is used for monitoring a spectral signal in a sensor in real time. According to the invention, homogeneous material integrated coupling packaging of the high-temperature optical fiber sensor can be realized.

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.