829 results about "Optical fiber coupler" patented technology

The invention belongs to the technical field of distributed optical fiber sensing, and particularly relates to an OFDR system phase noise compensation device and method based on an or equivalent optical fiber loop auxiliary interferometer. The optical fiber 2 * 2 coupler and the delay optical fiber form a loop and serve as a delay optical path of the auxiliary interferometer, the optical delay can be doubled every time laser passes through the loop, and therefore a plurality of beat frequency signals with different optical delays are obtained. And according to the to-be-measured optical fibers at different distances on the main interferometer, the beat frequency signal of the auxiliary interferometer with the closest optical delay is selected for compensation. And splicing the compensated reflected signals at different distances to obtain a distance domain reflected signal of the whole sensing optical fiber, thereby realizing phase noise compensation in the full range of the OFDR system. The OFDR full-range high-precision measurement is realized, and the OFDR full-range high-precision measurement device has the characteristics of simple structure, stable performance, low manufacturing cost and the like.

The invention discloses a PCB (printed circuit board) back drilling stub length detection device and method, and belongs to the technical field of PCB detection, the PCB back drilling stub length detection device comprises a broadband light source, the output end of the broadband light source is connected with an optical fiber coupler, and one end, deviating from the broadband light source, of the optical fiber coupler is respectively connected with a first optical fiber collimator and a second optical fiber collimator; the first optical fiber collimator is provided with a lens and a reflector on an optical transmission path; the second optical fiber collimator is provided with a galvanometer on a light transmission path, and a scanning lens is arranged in the light emitting direction of the galvanometer; and the optical fiber coupler is also connected with a spectrograph. On the basis of the low-coherence light interference principle, the PCB back drilling stub length detection device is designed, the output power and the output bandwidth of a broadband light source are correspondingly adjusted, the insertion loss of an optical fiber coupler is controlled, the collection rate of a spectrograph is adjusted, finally, the axial resolution reaches 5 micrometers, the transverse resolution reaches 10 micrometers, and the requirements that the diameter is smaller than 0.1 mm, and the detection precision is larger than 0.1 mm can be met. And detecting the stub length of the deep micropore with the depth of less than 10mm.

An optical fiber connector, an optical fiber adapter and an optical fiber connection system. The optical fiber connector (110) is configured to be mated with the optical fiber adapter (160). The optical fiber connector (110) includes an inner housing (111), a ferrule assembly (121), a rear body (122), an elastic member (133), and a sealing component (134). The sealing component (134) is clamped between the inner housing (111) and the rear body (122). The optical fiber adapter is configured to receive the optical fiber coupler. The optical fiber connection system includes the above-mentioned optical fiber connector and the optical fiber adapter.

The invention provides an OFDR sensing system and method for rapidly positioning strain based on a time domain difference algorithm, and relates to the technical field of optical fiber sensing. The OFDR sensing system comprises a narrow linewidth tunable laser light source, a first optical fiber coupler, a main interferometer, an auxiliary interferometer and a data acquisition and signal processing module; laser emitted by the narrow linewidth tunable laser light source is divided into two paths through the first optical fiber coupler, one path of light enters the main interferometer, and the other path of light enters the auxiliary interferometer; the main interferometer and the auxiliary interferometer respectively output a main interferometer optical signal and an auxiliary interferometer optical signal to the data acquisition and signal processing module; the data acquisition and signal processing module is used for performing nonlinear compensation on the optical signal of the main interferometer by using the optical signal of the auxiliary interferometer, and performing cross-correlation operation on a reference optical signal of the main interferometer and a measurement optical signal of the main interferometer which are based on the strain-free state and the strain state of the sensing optical fiber and are subjected to nonlinear compensation; and obtaining the strain position and the strain value of the sensing optical fiber.

The invention discloses an optical chip-optical fiber coupler based on a collimating grating penetrating through a substrate, which belongs to the technical field of photoelectric chips and comprises a substrate, an inverted optical chip is arranged on the substrate, and the optical chip comprises at least one optical device, an optical waveguide array for realizing input and output and a collimating grating array. The collimating grating array is provided with a gradually changing period and duty ratio, so that light output from the optical waveguide array is diffracted to the substrate through the collimating grating array and is propagated to the back surface of the optical chip as basically collimated light; an optical coupling element array is arranged at the position, corresponding to emergent light of the collimating grating array, of the back face of the optical chip to couple light to an optical fiber array. By the adoption of the structure, high-efficiency coupling of the optical chip and the optical fiber array is achieved, and compared with a common grating coupler and an edge coupler, the coupler has higher coupling efficiency and alignment tolerance, is easier to manufacture and can be widely applied to the fields of optical IO, photoelectric sealing (CPO) and the like of large-scale photoelectric integrated chips.

The invention discloses a multi-sideband chirp modulation DAS system and a working method thereof, and relates to the technical field of distributed sound wave sensing. The DAS system comprises a narrow linewidth laser, an optical fiber coupler, a phase modulator, an electro-optical modulator, an erbium-doped optical fiber amplifier, an optical fiber circulator, a dense wavelength division multiplexer, a photoelectric balance detector, a data acquisition card, an arbitrary waveform generator, a direct current source and the like. The phase modulator is used for modulating constant-amplitude multi-frequency continuous light, the frequency number of light waves is related to the harmonic number of a microwave modulation signal, the frequency interval is determined by the fundamental frequency of the microwave modulation signal, the continuous light frequency can be flexibly modulated by adjusting the microwave modulation signal, and the modulation bandwidth is large; detected beat frequency signals are compressed into single-frequency signals through pulses, phase information of the single-frequency signals is demodulated, vibration signals along the sensing optical fiber can be detected, the spatial resolution of the system depends on the chirp frequency sweeping range, and the spatial resolution is high.

The invention relates to the technical field of optical fiber sensing, and provides a parallel double-cavity optical fiber copper ion sensor, which comprises an optical fiber coupler, a sensing Fabry-Perot interferometer and a reference Fabry-Perot interferometer, the sensing Fabry-Perot interferometer comprises a first single-mode fiber, a first capillary glass tube and hydrogel; one end of the first single-mode optical fiber is connected with the optical fiber coupler, and the other end of the first single-mode optical fiber extends into the first capillary glass tube; hydrogel is arranged on the end surfaces of the first single-mode optical fiber and the first capillary glass tube; the reference Fabry-Perot interferometer comprises a second single-mode fiber, a second capillary glass tube and a third single-mode fiber; one end of the second single-mode optical fiber is connected with the optical fiber coupler, and the other end of the second single-mode optical fiber extends into the second capillary glass tube; the third single-mode optical fiber also extends into the second capillary glass tube; and a gap is reserved between the third single-mode optical fiber and the second single-mode optical fiber. According to the invention, two reflection spectrums with small frequency difference are superposed to generate amplified frequency change, so that the sensitivity of copper ion measurement is improved.

The invention discloses a 2 [mu] m nanosecond pulse fiber laser and a time domain waveform adjustment method thereof. The laser comprises a seed source module and an amplification module connected with the seed source module. The seed source module comprises a first high-reflectivity fiber bragg grating, an acoustic optical modulator, a first beam combiner, a first thulium-doped fiber, a 2 * 2 coupler and a second high-reflectivity fiber bragg grating which are connected in sequence, as well as a driving source connected with the acoustic optical modulator and a first pumping source connected with the first beam combiner; the amplification module comprises an online isolator, a second beam combiner, a second thulium-doped optical fiber and an output jumper which are connected in sequence, and a second pumping source connected with the second beam combiner; the rising edge time and the starting time of the acousto-optic modulator are subjected to parameter setting through a human-computer interface of the driving source; the wavelengths of lasers output by the first pumping source and the second pumping source are both 793 nanometers. According to the invention, the multi-peak phenomenon of the Q-switched pulse laser of the 2um waveband can be conveniently and effectively eliminated, the performance of the laser is improved, and the application requirements of low cost and mass production are met.

The utility model provides a low-reflection light-splitting monitoring fiber laser which comprises a fiber amplifier, a light-splitting isolation assembly, an output head and a photoelectric detector. The light splitting isolation assembly comprises a double-fiber collimator, a two-stage isolator and a single-fiber collimator which are sequentially arranged in the direction of a main light path, the double-fiber collimator comprises a first optical fiber, a second optical fiber, a first capillary tube and a first lens, and the fiber core end of the first optical fiber and the output end face of the first capillary tube form a first beam expanding length; the fiber core end of the second optical fiber and the input end face of the second capillary tube form a second beam expanding length, the input end of the first optical fiber is connected with the optical fiber amplifier, the output end face of the first lens faces the input end of the two-stage isolator, the output end face of the first lens is plated with an anti-reflection film, and the output end of the second optical fiber is connected with the photoelectric detector. According to the scheme, the optical path is more concise, a device optical fiber coupler is saved, more space is reserved, and the integration level of the laser module is higher.

The utility model discloses an optical fiber access automatic detection mechanism and an optical fiber coupler, and the mechanism comprises a flange seat which is fixedly disposed at the outer side of an optical fiber equipment housing, and is provided with an interface column used for being connected with an optical fiber connector; the contact ring is movably sleeved on the interface column, and when the optical fiber connector is inserted, the contact ring abuts against the optical fiber connector and synchronously displaces with the optical fiber connector; the first end of the sensing rod is connected with the back side end face of the contact ring, and the second end of the sensing rod penetrates through the optical fiber equipment shell; the microswitch is fixed on the inner side of the optical fiber equipment shell; when the optical fiber connector is inserted into a set position, the induction rod triggers the microswitch to send out an in-place detection signal; the device is simple in structure, low in cost and easy to maintain, the accuracy and stability of optical fiber access are improved, automatic detection is realized, and the communication quality is ensured.

The invention discloses a phase-shifting interference measuring device and a phase-shifting interference testing method based on a liquid crystal retarder. The device comprises a short coherent light source module and a Fizeau interference measurement module. A short coherent light source in the light source module is divided into p light and s light through a polarization splitting prism, and linearly polarized light is subjected to phase modulation through a liquid crystal variable retarder. Modulated polarized light is coupled through the optical fiber coupler and enters the interference module, interference occurs in the interference cavity, and finally an interferogram is obtained by the CCD camera for calculation. According to the invention, the problem of complex installation and adjustment caused by integration of a light source and an interference system of a traditional interferometer device is solved, the situation of unstable environment caused by movement of mechanical parts in traditional phase shift is avoided, and the influence of parasitic fringes is inhibited by using the characteristics of a short coherent light source. The device utilizes the characteristics of the liquid crystal variable delayer to realize phase modulation so as to realize phase shift interference and surface shape detection. According to the phase-shifting interference surface shape measuring device, a high-precision surface shape measuring result can be obtained.

The invention provides a detection system of a micro optical fiber coupler based on a bidirectional optical frequency comb vernier effect, which can be applied to the technical field of photoelectric detection. The system comprises: an optical frequency comb light source configured to emit detection light; the beam splitter is arranged to split the detection light into first sub-detection light and second sub-detection light; the reference sensing unit is arranged to guide the first sub detection light to interact with a reference solution through an evanescent field of the first micro optical fiber coupler so as to output first transmission light; the detection sensing unit is arranged to guide the second sub detection light to interact with the solution to be detected through an evanescent field of the second micro optical fiber coupler so as to output second transmission light; the beam combiner is set to combine the first transmission light and the second transmission light to obtain a combined light spectrum; the spectrum analyzer is set to collect the combined light and generate a vernier spectrum; and the processor is set to determine the concentration of the liquid to be detected according to the vernier spectrum.

The present invention provides an optical waveguide coupler (1) comprising a crystalline substrate (2) of a (100) type having a top surface (2a) and a (100) crystallographic plane (2100), wherein the crystalline substrate (2) comprises: a V-groove (3) extending in a Z-direction (Z) in a projection onto the top surface (2a), wherein the Z-direction (Z) lies within a 〈110〉 crystal plane (2110) of the crystalline substrate (2), wherein the top surface (2a) and a 〈100〉 crystal plane (2100) of the crystalline substrate (2) form a first angle (α1) in an X / Y plane (XY) perpendicular to the Z-direction (Z), and an optical waveguide arranged on the top surface (2a) of the crystalline substrate (2). (4), wherein the optical waveguide (4) extends along the Z-direction (Z) in a projection to the top side, wherein the V-groove (3) and the optical waveguide (4) are designed such that,When an optical fiber (5) having a predetermined size and a fiber core (51) and a fiber tip (52) is inserted into the V-groove (3) such that a distance between an outer end (42) of the waveguide core (4) and the fiber tip (52) is less than a predetermined distance (d), the fiber core (51) is aligned with the waveguide core (41) such that a displacement of the fiber core (51) and the waveguide core (41) is less than a predetermined displacement. Furthermore, the present invention provides a method for manufacturing an optical fiber coupler (1).

The invention discloses an optical coherence tomography optical path structure and a dispersion compensation method thereof. The light path structure comprises a coherent light source, a 2 * 2 optical fiber coupler, a reference light path, a sample light path, an equal-wave-number spectrograph and an upper computer; low-coherence broadband light emitted by the coherent light source is divided into reference light and sample light after passing through the 2 * 2 optical fiber coupler, the reference light and the sample light are sequentially transmitted in a reference light path and a sample light path, the reference light and the sample light are retroreflected through a sample and a reference mirror and are retroreflected to the 2 * 2 optical fiber coupler according to an original light path, interference is generated, and interference light beams are transmitted to the equal-wave-number spectrometer. Interference light beams are split to an upper computer according to equal wave number intervals, and a tomographic image of a sample is obtained through algorithm processing of the upper computer. By means of the structure, the existing dispersion loss problem is solved from the source, most dispersion generated by a light path is solved, other dispersion is eliminated by adding a dispersion compensating mirror made of optical glass materials with certain thickness in the light path through algorithm calculation, the algorithm is simple, convenient and fast, and the imaging speed is high.

The concentrated light source optical fiber distributed lighting system comprises a concentrated light source module, an optical fiber transmission unit and a lighting terminal, and the concentrated light source module is integrated with a control unit; the optical fiber transmission unit is connected with the concentrated light source module and the lighting terminal; the concentrated light source module comprises a light source, an optical fiber coupler and a cooling fan. A use method of the concentrated light source optical fiber distributed illumination system comprises the following steps that S1, illumination intensity is input into an MCU through a human-computer interface, light is transmitted to an illumination terminal through an optical fiber transmission unit, and the illumination terminal scatters the light and projects the light to an illumination place; s2, the temperature sensor extracts a laser / LED module temperature signal and sends the laser / LED module temperature signal to the MCU; s3, the fan driving power supply judges whether to supply power to the cooling fan or not according to the signal of the MCU, and the cooling fan cools the concentrated light source module; and S4, the illuminance sensor collects the illuminance of the illumination target place and feeds back the illuminance to the MCU, and the laser / LED module is driven to emit light with the corresponding intensity.

The invention discloses a self-starting 9-shaped cavity laser and device based on motor disturbance, and relates to the technical field of lasers. The laser comprises a nonlinear amplification loop, a linear arm, a polarization maintaining optical fiber coupler and a motor disturbance module. And the polarization-maintaining optical fiber coupler is connected with the linear arm and the nonlinear amplification loop respectively. High-frequency mechanical vibration is applied to the polarization-maintaining passive optical fiber in the nonlinear amplification loop through the motor disturbance module, so that a high-strength initial noise signal is formed in the cavity, mode competition in the cavity is promoted, and noise is accelerated to enter a positive feedback area of the resonant cavity. Mode locking self-starting under the low pumping condition is achieved, pumping power waste is reduced, and the device cost is reduced.

The invention discloses a power cable monitoring system and method based on single-core optical fiber multi-parameter sensing. The monitoring system comprises a laser, a first optical fiber coupler, an acousto-optic modulation unit, an optical fiber circulator, a distributed sensing optical fiber, a power cable, a wavelength division multiplexer, a second optical fiber coupler and a data acquisition monitoring unit. When the power cable to be detected is subjected to temperature change and vibration change, the temperature value of the power cable can be obtained by demodulating Raman scattering light data in backscattering light of the distributed sensing optical fiber, and Rayleigh scattering light in the backscattering light and local laser are subjected to interference frequency mixing to obtain a beat frequency signal; and the beat frequency signal is demodulated to obtain a vibration signal of the power cable. Based on the Raman scattering effect and the Rayleigh scattering effect, the temperature and vibration signals of the power cable can be detected at the same time only through one single-core optical fiber, and the method has the advantages of being high in signal-to-noise ratio, low in cost, easy and convenient to operate and the like.

The pre-pulse thulium laser lithotripsy system comprises an interaction unit, a control unit, a thulium-doped fiber laser, a thulium-doped fiber amplifier, a laser fiber coupler and a lithotripsy fiber, wherein the interaction unit forwards a user instruction to the control unit; the control unit controls the thulium-doped fiber laser and the thulium-doped fiber amplifier according to a user instruction; the thulium-doped fiber laser outputs laser pulses to the thulium-doped fiber amplifier according to the control instruction; the thulium-doped optical fiber amplifier sets a laser amplification factor according to the control instruction and amplifies the laser pulse; the optical fiber coupler is used for coupling the amplified laser pulse; and the lithotripsy optical fiber acts the coupled laser pulse on the calculus or sticky tissue of the calculus patient. Through the combination of the thulium-doped fiber laser with the MOPA structure and the thulium-doped fiber amplifier, high-peak power nanosecond pulse can be realized, micro-explosion bubbles are instantly generated, the energy loss before laser acts on stones is reduced, the unit energy lithotripsy efficiency is improved, and the lithotripsy effect is improved.

The invention relates to the technical field of quantum measurement, and provides a high-precision quantum distance measuring device and method based on a frequency entangled state, and the device comprises an entangled photon source, a polarization beam splitter, a single-mode optical fiber coupler group, an optical fiber circulator, and an optical receiving and transmitting antenna. The entangled photon source comprises a pump light source, a first lens, a nonlinear optical crystal, a temperature control furnace, a temperature control module, a second lens, a dichroscope and a long pass filter; a third port of the polarization beam splitter is connected with a reflector, the reflector is connected with a second single-mode optical fiber coupler, and the second single-mode optical fiber coupler is connected with a second single-photon detector; a second port of the polarization beam splitter is connected with a first single-mode optical fiber coupler, the first single-mode optical fiber coupler is connected with an optical fiber circulator, one end of the optical fiber circulator is connected with an optical transceiving antenna, and the other end of the optical fiber circulator is connected with a first single photon detector; the method has the advantages of wide range and high-precision distance measurement, and can better complete distance measurement.

The invention discloses a Fabry-Perot interference type hydrogen detection device and method. The Fabry-Perot interference type hydrogen detection device comprises a broadband light source, a spectrograph, an optical fiber coupler, a sensing probe, a test gas chamber and a reference probe, the sensing probe and the reference probe are provided with sensor structures based on an optical fiber Fabry-Perot cavity, and the optical fiber coupler outputs input light emitted by the broadband light source to the sensing probe and the reference probe through a port A, a port B and a port C; light reflected by the optical fiber Fabry-Perot cavities of the sensing probe and the reference probe is output to a spectrograph through a D port, so that an interference spectrum is demodulated; hydrogen to be detected is mixed with air, then enters the test gas chamber through the gas flow rate controller, and is discharged from the outlet; the sensing probe adopts an anodic aluminum oxide / palladium film as a terminal reflector of a Fabry-Perot cavity, and an interference spectrum is detected through a spectrograph to obtain hydrogen concentration information in the environment; the reference probe adopts two single-mode optical fiber end faces to align in a sleeve and form an air Fabry-Perot cavity, and the reference probe only provides a stable reference spectrum to realize a vernier effect.

The invention relates to a self-coherence optical fiber interference device and method for simultaneously measuring morphology and thickness. The device comprises a light source module (1), a measurement light path (2), a compensation light path (3), a spectrograph (4), a mechanical motion module (6) and a data processing module (5), the measuring light path (2) comprises an optical fiber circulator (21), an optical fiber retroreflector (22) and an optical probe (23) and is used for realizing focusing measurement and enabling reflected light of the end face of the optical fiber retroreflector (22) and reflected light of a transparent object to be measured to return; reflected light of the end face of the optical fiber retroreflector (2) and reflected light of the transparent object to be measured form a measuring light beam, and the measuring light beam enters the compensation light path (3); the compensation light path (3) comprises an optical fiber splitter (31), an optical fiber delay line (32) and an optical fiber coupler (33), the measuring light beam is subjected to optical path compensation to generate a compensation light beam, and the compensation light beam and the measuring light beam are combined and input into the spectrograph (4) together.

The invention relates to the technical field of chip packaging, in particular to a photoelectric co-packaging underfill isolation packaging framework and process. According to the invention, the underfill glue blocking hole is additionally designed in the underfill glue diffusion area at the outer edge of the optical fiber slot hole on the adapter plate, and through the resistance effect (interface difference and liquid tension) of the underfill glue blocking hole on the flowing of the underfill glue, the glue overflow range is accurately controlled, and the underfill glue is prevented from covering the optical fiber coupler of the optical chip. By optimizing the underfill isolation design, efficient coupling of the optical chip and the optical fiber is ensured in the pollution direction of the underfill, meanwhile, the packaging gap between the photoelectric chips is reduced, and the packaging density and compactness are improved; the process tolerance, the product yield and the system performance of photoelectric packaging are remarkably improved, and the method is particularly suitable for the application fields of high-density and high-performance calculation and optical interconnection.

The invention discloses a vector flow velocity measuring device and method based on a bidirectional scanning spectral domain optical coherence tomography technology. Comprising a super light-emitting diode light source, an optical fiber coupler, a polarization controller, an interferometer comprising a sample arm and a reference arm, and a collimating lens, the collimating lens, the grating, the focusing lens group and the linear array camera are sequentially connected through a light path; the linear array camera, the computer and the two-dimensional galvanometer are sequentially connected through a line; according to the method, the fixed bias vector velocity is introduced by utilizing the bidirectional scanning technology, the dynamic light scattering optical coherence tomography method and the Doppler optical coherence tomography method are combined, decoupling of each parameter of the vector flow velocity is efficiently and accurately realized, and a quantitative index is provided for vector flow velocity analysis. The vector flow velocity measuring device based on the bidirectional scanning spectral domain optical coherence tomography technology is simple in system setting and low in cost, the time resolution is improved by about 2.5 times, and the measuring time is shorter.

The utility model relates to a control device for a microwave anechoic chamber test system. Comprising a shielding box which is a sealed cavity provided with a cover plate, and the shielding box is provided with a power supply socket, a data socket and an optical fiber coupler; a control circuit board, an AC-DC power supply module, a data optical fiber transceiver and other modules are installed in the shielding box. A plurality of motor control units, a power supply interface and a communication interface are integrated on the control circuit board, and a first output end of the AC-DC power supply module is connected with the control board and is used for supplying power to the control board; one end of the data optical fiber transceiver is electrically connected with the optical fiber coupler, and the other end is electrically connected with the communication interface for converting the signal into an optical signal and outputting the optical signal. The control circuit board is placed in the shielding box, so that the size of the rotary table or antenna tower equipment is reduced, and the electromagnetic interference risk of a motor and a darkroom environment is reduced; the control circuit board integrates the servo motor control unit and the stepping motor control unit for modular design, serves as an independent unit of the darkroom test system, and is high in universality.

The invention provides a self-focusing type wafer three-dimensional shape precision detection device and method. The self-focusing type wafer three-dimensional shape precision detection device comprises a super-radiation light-emitting diode, an optical fiber coupler, a microscopic reference arm provided with a reference arm microscope objective, a self-focal length wafer scanning platform of a microscopic scanning platform, a near-infrared reflection type spectrograph and an upper computer. During detection, near-infrared broadband light radiated by the diode is coupled into the optical fiber coupler and then is divided into detection light and reference light; moving the wafer to be detected to the focal point of the detection light; the detection light is focused on a to-be-detected wafer sample to form measurement light carrying sample surface information, then the measurement light is backscattered by the sample surface and interferes with the reference light at the optical fiber coupler, a formed interference light signal is captured by the near-infrared reflection type spectrometer and then is transmitted into the upper computer, the wafer sample is moved at the focus of the detection light, and the measurement light is transmitted to the lower computer. Performing X-axis and Y-axis scanning to obtain three-dimensional shape data of the wafer; according to the invention, the high-precision nondestructive detection of the three-dimensional shape of the chip can be realized under the condition that the chip sample is not damaged.

The invention discloses a narrow linewidth optical fiber laser system based on a self-injection locking feedback mechanism, which belongs to the field of optical fiber communication and comprises a main cavity, a self-injection locking feedback module and an erbium-doped optical fiber amplifier. Wherein the main cavity internally comprises a composite ring cavity filter for selecting a longitudinal mode; the composite ring cavity filter is sequentially connected with a polarization controller, a first erbium-doped fiber, a first wavelength division multiplexer, a second erbium-doped fiber and a first uniform fiber bragg grating through a first circulator; the output end of the first uniform fiber bragg grating is connected with the input end of a first optical fiber coupler, one output end of the first optical fiber coupler is sequentially connected with an optical fiber delay line and a Faraday rotating mirror in the self-injection locking feedback module, and the rotating angle of the Faraday rotating mirror is 90 degrees; and the other output end of the first optical fiber coupler is connected with the input end of the erbium-doped optical fiber amplifier. Through the above structure, the stability of the laser system is improved.

The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber sensor system, a sensing signal measuring method, computer equipment and a medium. The optical fiber coupler comprises at least two optical fiber interference arms which are arranged in parallel and is used for dividing an optical signal into at least two beams and enabling the beams to be propagated along different paths to generate interference; the polarization controller is arranged at the emergent end of the optical fiber coupler and is used for regulating and controlling the polarization state and the polarization direction of the emergent light; the voltage control module is arranged on at least one optical fiber interference arm and used for changing the phase of the optical fiber by applying voltage; the image sensor is used for collecting interference fringe images and converting the interference fringe images into electric signals; and the data processing device is used for carrying out peak searching calculation on the electric signal to obtain stripe movement information, and obtaining a corresponding sensing signal value according to the relationship between the stripe movement information and the sensing signal. The application range of the interferometer in the visible light wave band is expanded, and the measurement precision of the interferometer is improved.

The invention discloses a TGD-OFDR / OCC-BOTDR integrated multi-parameter sensing system and a working method thereof, and relates to the technical field of optical fiber sensors. The multi-parameter sensing system comprises a laser, an optical fiber coupler, an electro-optical modulator, an optical fiber circulator, an optical fiber Bragg grating, an acoustic optical modulator, an erbium-doped optical fiber amplifier, a random scrambler, a piezoelectric ceramic tube, a heating vessel, a delay optical fiber, a photoelectric balance detector, a filter and detector, a data acquisition card, a polarization controller, a direct-current power supply and a microwave source. An arbitrary waveform generator and the like. According to the invention, multiple parameters can be represented at the same time, the measuring speed is fast, and the sampling rate of the system can be effectively improved under the condition that sensing parameters are the same; the method has the advantage of high spatial resolution; the sensor has the advantages of high fusion and low cost, can realize simultaneous measurement of vibration and temperature / strain through single sensing, and is high in fusion and effective in cost control.

The invention discloses a polydimethylsiloxane sensitization optical fiber temperature and strain simultaneous measurement sensor. The sensor comprises an incident optical fiber, an optical fiber coupler, an optical fiber patch cord, a transmission optical fiber, a sensing cavity, a reference cavity and an emergent optical fiber, an optical signal enters the optical fiber coupler through the incident optical fiber and is divided into two beams of equal-intensity light in the coupler, the two beams of light are respectively input into the transmission optical fiber through the optical fiber patch cord and then enter the sensing cavity and the reference cavity which are coated with the polydimethylsiloxane, and the light is reflected by the cavities to form interference; the interference light is transmitted back to the optical fiber coupler through respective transmission optical fibers, so that a vernier spectrum is formed; the emergent optical fiber transmits an optical signal containing temperature strain information to a spectrograph, trough drift is analyzed through a dual-wavelength matrix demodulation method, and simultaneous measurement is achieved. By combining the vernier effect, the structural advantages of the Fabry-Perot interferometer and the advantage of high thermo-optical coefficient of the polydimethylsiloxane, the invention has the advantages of low cost, high sensitivity, high stability and the like.

The invention discloses a wind driven generator intelligent monitoring method and device based on an optical fiber sensor, and the method comprises the following steps: 1, optical fiber signal transmission and analysis: installing an optical fiber grating sensor in an area where a blade, a bolt and an air gap are located, and enabling the optical fiber grating sensor to be connected with an optical fiber grating signal analysis module through an optical fiber coupler, the analysis module sends an optical signal to the sensor and receives an optical signal reflected by the sensor; the fiber bragg grating signal analysis module demodulates the received optical signal, analyzes the change of optical wavelength, and extracts temperature, stress, vibration, deformation and air gap information of each monitoring point; through digital processing of sensing signals, the analysis module judges the state of blade, bolt and air gap information in real time and sends out an alarm signal according to a preset threshold value. 2, processing and outputting data; step 3, fault early warning and maintenance; according to the invention, the operation safety and efficiency of equipment can be improved.