384 results about "Fiber ring" patented technology

The invention provides a distributed optical fiber temperature detection double-end correction device and method, and belongs to the technical field of optical fiber logging, the upper end of a logging optical cable is connected with a ground reference optical fiber ring, and the lower end of the logging optical cable is connected with an optical fiber grating sensor; the electronic temperature sensor is placed in the ground reference optical fiber ring, the measurement and control module is connected with the electronic temperature sensor, and the temperature of the ground reference optical fiber ring is measured through the electronic temperature sensor; the pump light source and the DTS measurement module are connected with the COM optical splitter; the optical switch is used for switching DTS distributed optical fiber measurement and optical fiber grating sensor measurement; temperature values measured by the DTS distributed optical fiber and the optical fiber grating sensor serve as reference data to adjust measurement parameters of the DTS measurement module, and double-end correction of DTS temperature measurement data is completed. The ground reference optical fiber is combined with the electronic thermometer, and the optical fiber grating sensor is adopted underground, so that distributed optical fiber temperature measurement double-end correction is realized.

The invention discloses an airborne combined measurement calculation method for closed-loop optical fibers, which comprises the following steps that: an orthogonally distributed three-axis closed-loop optical fiber gyroscope array acquires a Sagnac phase difference signal in real time, each optical fiber ring adopts an asymmetric pretightening force winding process, the pretightening forces of X / Y / Z axes are 12 + / -0.5 N, 8 + / -0.3 N and 15 + / -0.5 N respectively, the diameter ratio of the optical fiber rings is 1: 0.8: 1.2, environmental disturbance compensation is carried out, and the Sagnac phase difference signal is acquired in real time. Data of 48 PT1000 temperature sensors embedded in the axial direction of an optical fiber ring at the interval of 5 mm and full spectrum data of a three-axis vibration sensor at the frequency band of 0-2000 Hz are synchronously collected, and a coupling error model is constructed based on temperature gradient distribution and vibration spectrum characteristics. Therefore, through an asymmetric winding process, temperature-vibration coupling compensation, improved data fusion and dynamic closed-loop control, the problems of nonreciprocal errors caused by the symmetric winding process, insufficient environmental adaptability of single temperature compensation, limited nonlinear error processing capability of standard Kalman filtering and stability of a fixed parameter controller are solved; high-precision and high-reliability airborne combined measurement is realized.

The invention discloses a millimeter wave signal phase noise testing method based on ultra-stable laser, and the method comprises the steps: generating the ultra-stable laser through employing a common-cavity Brillouin laser frequency stabilization technology, taking the ultra-stable laser as a carrier wave, and carrying out the double-sideband modulation of a to-be-tested millimeter wave signal; frequency shifts of the two sidebands are different, the sideband with high frequency has more downward frequency shifts, the sideband with low frequency has less downward frequency shifts, the generated common-cavity Brillouin laser and the double-optical-sideband pumping laser are coupled and separated to obtain upper and lower double-sideband optical signals with different frequency intervals, and then beat frequency and mixing frequency are performed to generate an intermediate frequency signal with MHz magnitude; the noise characteristic of the intermediate frequency signal directly carries the phase noise of the to-be-tested signal, and the phase noise analyzer carries out noise spectrum density analysis and quantitative evaluation on the intermediate frequency signal to complete the phase noise test of the to-be-tested millimeter wave signal. The collaborative optimization problem that the reference source stability, the system noise and the to-be-tested signal noise are difficult to separate in the ultrahigh frequency signal noise test is solved.

The invention discloses a single-photon non-vision-field target tracking system based on an unmanned aerial vehicle platform, which belongs to the field of non-vision-field imaging and is characterized in that a laser is connected with a scanning galvanometer assembly through a first nanosecond optical path switch and an optical fiber circulator to form an emission optical path for emitting laser pulses to relay reflecting surfaces corresponding to four predetermined positioning points; the scanning galvanometer assembly is connected with the photon detector through the collimating optical fiber, the optical fiber circulator and the second nanosecond optical path switch to form a receiving optical path capable of receiving echo photons; the main control module is electrically connected with the laser, the first nanosecond light path switch, the second nanosecond light path switch, the scanning galvanometer assembly, the photon detector, the time-to-digital converter and the high-frequency inertial measurement unit respectively, and can control each component to perform laser ranging, double-window gating, single-photon detection, inertial measurement unit sampling and timing according to a unified time sequence; and the three-dimensional coordinates of the current non-vision target are calculated by using the distance measurement data through an ellipsoid intersection solution method, so that non-vision target tracking is realized.

The invention discloses a high-precision liquid level measuring device and method based on sweep frequency interference measurement, belongs to the technical field of optical-mechanical-electrical integrated measurement, and is used for high-precision liquid level measurement. The light path is composed of a frequency sweep correction light path and a measurement calibration light path. The device comprises a sweep-frequency light source, an optical fiber splitter, a high-speed acquisition card, a computer, an optical fiber circulator, an optical fiber reflector, a Fabry-Perot (FP) etalon, a balanced photoelectric detector (BPD), a liquid level measuring probe and the like. The FP etalon realizes a sweep frequency correction function, a measurement calibration light path switches channels through the one-to-two photoelectric switch, and high-speed signal acquisition is carried out through the BPD and the high-speed acquisition card. The measuring process is free of mechanical movement and has the advantage of being free of maintenance; the FP etalon is introduced for nonlinear frequency sweeping calibration, the measurement precision is improved, the micron-level measurement precision can be achieved under the better experiment condition, and the non-contact measurement method can meet the requirement for high-precision liquid level measurement in the fields of chemistry, chemical engineering and the like.

The invention particularly relates to a method for determining a magnetic shielding body material of an optical fiber ring, and solves the technical problems that the magnetic shielding effect is poor and the magnetic shielding performance requirement of an optical fiber gyroscope is difficult to meet due to the lack of an optimal selection method for a magnetic shielding body in the prior art. The invention discloses a method for determining a magnetic shielding body material of an optical fiber ring. The method comprises the following steps: 1) calculating relative permeability of each magnetic shielding material under different magnetic induction intensities; 2) establishing an optical fiber ring magnetic shielding simulation model; 3) simulating to obtain first magnetic induction intensity of a magnetic field environment where the optical fiber ring is located; 4) selecting the material of the magnetic shielding body on the outermost layer; and 5) performing simulation in sequence from outside to inside to obtain the magnetic induction intensity of the magnetic field environment where the optical fiber ring is located, and based on the magnetic induction intensity, selecting the magnetic shielding material with the highest relative magnetic conductivity in the multiple magnetic shielding materials in the step 1) in sequence as the material of the magnetic shielding body of the corresponding shielding layer until the material of each layer of magnetic shielding body in the optical fiber ring is determined.

The utility model discloses an optical fiber ring packaging device, which comprises a packaging cover, an optical fiber ring and a packaging base, the packaging base is provided with an annular cavity, and the optical fiber ring is accommodated in the annular cavity. The packaging cover and the packaging base are connected in a matched mode to form a magnetic shielding face. The outer side joint and the inner side joint of the packaging cover and the packaging base are welded through laser. The laser direction is perpendicular to the magnetic shielding surface. According to the utility model, when the high-precision optical fiber ring is packaged and welded, the welding seam still has an anti-magnetic shielding function, and the magnetic field performance of the optical fiber ring is improved.

The present application relates to a fiber optic gyroscope with stress compensation. In addition to the existing fiber optic gyroscope comprising a light source, a coupler, a Y-waveguide, a fiber optic ring, a detector, and a signal processing circuit, a temperature sensor and a piezoelectric ceramic are added. The coupler is connected to the light source, the detector, and the Y-waveguide, respectively; and the signal control circuit is connected to the detector, the temperature sensor, the Y-waveguide, and the piezoelectric ceramic, respectively. Since the fiber optic ring is wound with a first optical fiber and a second optical fiber, the Y-waveguide and the fiber optic ring are connected via a first optical fiber pigtail and a second optical fiber pigtail, and the first optical fiber pigtail or the second optical fiber pigtail is also wound around the piezoelectric ceramic. During operation, the signal processing circuit controls the piezoelectric ceramic in real time to perform pressure compensation on the first optical fiber pigtail or the second optical fiber pigtail wound around the piezoelectric ceramic based on the sensitive angular velocity information and temperature information of the fiber optic gyroscope, thereby balancing the stress values ​​on both sides and thereby compensating for the zero drift of the fiber optic gyroscope caused by stress.

The invention discloses a power transmission line unmanned aerial vehicle communication networking system based on an optical fiber ring network, and relates to the field of power transmission line communication networks. The plurality of integrated base stations form an optical fiber ring network through the OPGW optical cable and the LTE MESH ad hoc network; the unmanned aerial vehicle executing the power transmission line inspection task and the corresponding fixed airport are accessed to an information intranet through an optical fiber ring network; wherein the integrated base station comprises an OPGW integrated base station and a MESH integrated base station; the OPGW integrated base station is deployed at a node with an optical fiber splice closure on a power transmission line tower, and is accessed to the information intranet in a wired connection mode; and the MESH integrated base station is deployed at a node, without an optical fiber splice tray, on a power transmission line tower, and is accessed to the OPGW integrated base station in a wireless connection mode. The power transmission line unmanned aerial vehicle communication networking system based on the optical fiber ring network can guarantee timely, safe and efficient large-scale data transmission.

A satellite system may have a constellation of communications satellites that provides services to users with electronic devices such as portable electronic devices and home / office equipment. The satellites may support communications between the electronic devices of the users and gateways. Each gateway may have satellite transceiver circuitry that transmits and receives satellite signals. Each gateway may also have an optical add-drop multiplexer coupled to a fiber ring and radio-frequency-over-fiber circuitry coupled between the satellite transceiver circuitry and the optical add-drop multiplexer. A metropolitan point-of-presence may be in communication with the fiber ring and may have modems for centrally processing communications (received and transmitted in an intermediate frequency) in the satellite system.

The invention discloses an optical fiber ring network optical cable link multi-mode physical information sensing method and system, and belongs to the technical field of optical fiber ring network communication link monitoring. In order to solve the technical problem that a fault of an electric power communication optical cable link is difficult to accurately identify and distinguish due to the coupling effect of multiple physical quantities such as external damage, stress and temperature, based on a single idle optical fiber, the phase change of a backscattering signal is obtained through a phase reduction technology; and a multi-mode physical quantity coupling model containing axial, radial and circumferential strain and temperature is constructed and inverted, so that quantitative distinguishing and positioning of stress, strain, temperature and vibration are realized. According to the method, a step-by-step decoupling strategy of first temperature compensation, then strain inversion and then vibration separation is adopted, and a two-stage discrimination mechanism of physical prior and machine learning is combined, so that the accuracy and interpretability of event recognition are remarkably improved. Depth perception and accurate fault positioning of the physical state of the optical cable link are realized.

The invention relates to a nanosecond fiber laser and method for high-order chaotic pulses. A fiber ring cavity of the laser comprises a wavelength division multiplexer, an erbium-doped fiber, a first polarization controller, an analyzer, a second polarization controller, an output coupler, a dispersion control unit, a fiber isolator and a band-pass filter which are connected in sequence. The method comprises the steps that pumping continuous light is coupled into the laser through the wavelength division multiplexer; pumping continuous light is absorbed by using an erbium-doped optical fiber and is stimulated to radiate a long-wave-band gain pulse; under the combined action of the first polarization controller, the polarization analyzer and the second polarization controller, an equivalent saturable absorption effect is generated by utilizing nonlinear polarization rotation generated when gain pulses are propagated in an optical fiber, and large anomalous dispersion is introduced to realize generation of nanosecond pulses; through the band-pass filter, nanosecond pulses are allowed to be generated, and meanwhile, the nonlinear increasing speed of propagation and accumulation of the nanosecond pulses in the cavity is controlled, so that order-by-order generation of high-order chaotic pulses is realized. According to the invention, reliable output of high-order chaotic pulses can be realized.

The invention relates to the technical field of optical measurement, and provides an electro-optical modulator parameter measurement device based on an optical fiber ring resonant cavity, which comprises an optical signal modulation system, an optical fiber ring resonant cavity system and a signal acquisition system which are sequentially connected through optical fibers, the optical signal modulation system comprises a to-be-measured electro-optical modulator which modulates an optical signal and outputs a modulated signal; the optical fiber ring resonant cavity system comprises an optical fiber coupler and a linear piezoelectric ceramic optical fiber stretcher; an annular optical fiber is formed based on an optical fiber coupler, and a plurality of reciprocating optical signal loops are formed in the annular optical fiber. The linear piezoelectric ceramic optical fiber stretcher is used for changing the length of the annular optical fiber; the signal acquisition system acquires signals and calculates parameters. Compared with the prior art, the method has the advantage that the resolution during measurement is improved.

The present invention discloses a method for preparing a micro bionic intervertebral disc scaffold by using near-field direct writing 3D printing technology. The present invention uses near-field direct writing 3D printing technology to print fiber ring laminated scaffolds with a reticular laminated intersecting structure of various specifications, arranges the fiber ring laminated scaffolds in the order of increasing pore size, heats the fiber ring laminated scaffolds, and manually curls the fiber ring laminated scaffolds at an angle of 45° obliquely to imitate the structure of the rat fiber ring, obtaining a simulated fiber ring laminated scaffold with a gradient change in pore size from inside to outside; methyl acrylated gelatin GelMA is perfused into the center of the fiber ring laminated scaffold as the nucleus pulposus to obtain a highly bionic intervertebral disc scaffold. The intervertebral disc scaffold prepared by the present invention has the characteristics of small size, ultra-high precision, high bionics, and good repair effect, and has been successfully used for micro spinal repair of small vertebrates, and is expected to be applied to intervertebral disc replacement and repair of vertebrates.

The invention discloses a high-spatial-resolution TGD-OFDR system and a working method thereof, relates to the technical field of distributed sound wave sensing, and is used for obtaining a large sweep frequency range by using relatively low modulation cost. The high-spatial-resolution TGD-OFDR system comprises a laser, an optical fiber coupler, a semiconductor optical amplifier, a broadband acoustic optical modulator, an optical isolator, a photoelectric detector, an optical fiber circulator, a photoelectric balance detector, a data acquisition card, a computer, a radio frequency signal source, a radio frequency correction unit and the like. The frequency sweeping range of the system is flexibly realized by repeated linear modulation of the low-bandwidth broadband acousto-optic modulator, the size of the frequency sweeping range is related to repeated modulation times, the frequency sweeping range can be flexibly controlled by controlling the repeated modulation times, and the spatial resolution of the system is improved; compared with a mode of using a large-bandwidth modulator and a high-performance radio-frequency signal source, the system provided by the invention has the advantages that the performance requirements on the radio-frequency signal source and the modulator are reduced, and the system cost is low.

The invention discloses an ultrahigh repetition frequency adjustable ultrashort pulse cluster generator which comprises a mode-locked fiber laser, a first fiber coupler, a fiber delay line, a dispersion compensation fiber, a second fiber coupler, a fiber amplifier and an acousto-optic modulator. The first optical fiber coupler, the optical fiber delay line, the dispersion compensation optical fiber, the second optical fiber coupler and the optical fiber amplifier are sequentially connected end to end to form an optical fiber annular cavity, and the annular cavity is used as a frequency increasing device for pulse multiplication; the length difference between the optical fiber annular cavity and a mode-locked cavity in the mode-locked optical fiber laser is adjusted through the optical fiber delay line, and frequency increasing is carried out by using a vernier effect generated by time delay; the ultrahigh repetition frequency ultrashort pulse cluster laser output with adjustable parameters is realized through gain adjustment in the optical fiber annular cavity and synchronous pulse pickup outside the cavity. According to the technical scheme, the structural design is reasonable, the structure is simple, stability is good, sub-pulses are strictly equidistant, parameters are flexible and adjustable, and practicability is good.

The invention discloses a fiber ending wheel assembly, a full-automatic optical fiber winding machine and a fiber ending method. The fiber ending wheel assembly is characterized by comprising a coaxial wheel, a first fiber pulling rod and a second fiber pulling rod, a winding ring is arranged on the right side of the coaxial wheel; the multiple positioning blocks are arranged on the winding ring in the circumferential direction. The positioning block is provided with a left tail fiber groove and a right tail fiber groove. A first fiber pulling rod and a second fiber pulling rod are arranged on the winding ring in a penetrating manner; the projection of the first fiber pulling rod towards the positioning block is positioned in the left tail fiber groove and is close to the left; the projection of the second fiber pulling rod towards the positioning block is positioned in the right tail fiber groove and is close to the left; and a first driving source and a second driving source are arranged in the winding ring. When the tail fiber wheel assembly rotates, a first tail fiber section (or a second tail fiber section) connected between a first fiber supply module (or a second fiber supply module) and an optical fiber ring on an optical fiber ring framework can be automatically and accurately guided into a left tail fiber groove (or a right tail fiber groove) of a ring winding upper positioning block for fiber winding, and automatic winding of two tail fibers can be smoothly completed.

The application discloses a communication method, device, system and train, relates to the field of optical fiber communication, and is applied to a processor in any compartment of a train, wherein the processor is connected with an optical fiber ring network, the processor and train communication equipment in the compartment perform communication data interaction, and then the processor and the optical fiber ring network perform communication data interaction in the form of optical signals, so that the train communication equipment in different compartments can communicate with each other. The communication data is not easy to be lost and is not easy to be affected by electromagnetic interference through the mode of data transmission by optical fibers instead of cables, so that the communication quality of the train communication equipment is improved. Moreover, the communication data of multiple train communication equipments is converted into optical signals and transmitted in the form of a bundle of light, so that multiple communication networks are not needed, and only one optical fiber ring network can realize data transmission of multiple train communication equipments at the same time, so that the complexity of the wiring environment in the train is reduced, and the total weight of the train is reduced.

The invention discloses a fiber arrangement structure of a three-axis integrated fiber-optic gyroscope, and relates to the technical field of three-axis integrated fiber-optic gyroscope design, the fiber arrangement structure comprises a fiber-optic gyroscope table, a fiber-optic ring, a shock absorber and a groove are arranged on the fiber-optic gyroscope table, the groove is composed of an annular fiber coiling area, a through hole and a surface wiring groove and is used for standardizing a fiber path, a traditional fiber coiling cavity is cancelled, and the fiber coiling area is increased; the peripheral space of the optical fiber ring is used for fiber coiling and layout, the overall framework is optimized, the problems of non-standard optical fiber routing and mass center control are solved, the optical fiber ring is suitable for miniaturized products, and the overall size is reduced.

The invention discloses a fiber-optic gyroscope interference light path device for improving reciprocity. The fiber-optic gyroscope interference light path device comprises a light path part and a circuit part, wherein the light path part is connected with the circuit part; the light path part comprises a light source, an optical fiber coupler and an interference light path; wherein the interference light path comprises a Y waveguide, an optical fiber ring and a detector; the light source is connected with the optical fiber coupler through an optical fiber; the optical fiber coupler is connected with the Y waveguide through an optical fiber; the Y waveguide is connected with the optical fiber ring through an optical fiber; the optical fiber coupler is connected with the detector through an optical fiber; the light source and the detector are both connected with the circuit part. According to the invention, the reciprocity is improved, and the full-temperature zero-bias stability qualification rate after compensation of the fiber-optic gyroscope product is realized.

This invention discloses a magnetically controlled end-face protection device for hollow optical fibers and its preparation method. The device includes: a fixed base for fitting and fixing to the periphery of the hollow optical fiber end; a magnetically controlled hollow fiber ring composed of a polymer matrix and pre-magnetized magnetic particles dispersed in the polymer matrix, capable of radial contraction or radial expansion deformation under the action of an external magnetic field; the magnetically controlled hollow fiber ring is disposed on the fixed base and fitted to the hollow optical fiber end, forming a physical barrier to the end face of the hollow optical fiber in the radial contraction state; and a flexible protective layer disposed on the inner wall surface of the magnetically controlled hollow fiber ring. The end-face protection device of this invention can achieve remote reversible protection of the hollow optical fiber end face and zero-power standby.

The present invention discloses a large dynamic range resonant fiber optic gyroscope, belonging to the technical field of optical sensing. It solves the problem that current optical gyroscopes have a small dynamic range and are non-adjustable, making it difficult to meet the needs of places with a large range of rotational speed variations, and that the direction of rotational speed can only be determined by phase modulation of light. The invention comprises first and second voltage signal sources, a laser, a polarization controller, a fiber coupler, a fiber ring, a piezoelectric ceramic tube, a detector, and a signal processing and control system. The invention utilizes the piezoelectric ceramic tube to control the cavity length of the fiber resonant cavity, thereby achieving a large dynamic range. At the same time, a narrow linewidth laser is utilized to output continuous, constant-intensity, frequency-tunable narrow linewidth laser light to obtain the transmission spectrum of the fiber resonant cavity. By accurately locating the resonant frequency, the magnitude and direction of the rotational speed can be simultaneously determined. The invention has the advantages of a large dynamic range, a large rotation rate measurement range, and the ability to determine the direction of rotational speed without phase modulation of light.

The application discloses a device and method for coexistence of bright-dark solitons based on a mode division multiplexing resonant cavity, and relates to the technical field of lasers.The device for coexistence of bright-dark solitons based on the mode division multiplexing resonant cavity comprises an erbium-doped fiber amplifier, a first optical coupler, an acousto-optic frequency shifter, a second optical coupler, a third optical coupler, a first mode selection coupler, a second mode selection coupler and a fiber ring resonant cavity, and the fiber ring resonant cavity is a non-uniform dispersion few-mode fiber.The device and method for coexistence of bright-dark solitons based on the mode division multiplexing resonant cavity can realize stable coexistence of bright-dark solitons.

The application discloses a kind of time division multiplexing three-axis wide spectrum light source resonant type fiber-optic gyroscope detection systems and methods, belong to gyroscope optical system design field.System is constituted by optical system and signal detection system, and optical system includes a wide spectrum light source, a push-pull Y waveguide, a circulator, three mutually orthogonal transmission type fiber ring resonant cavity, two sections of delay optical fiber and a photoelectric detector;Signal detection system includes modulation and demodulation module, time division decoupling module and low-pass filter module.Three transmission type fiber ring resonant cavities are sequentially connected, and the time of optical signal reaching three fiber ring resonant cavities is different by being set delay optical fiber between adjacent two transmission type fiber ring resonant cavities.The application ingeniously designs three fiber ring resonant cavities to form three-axis integrated structure.In this way, the time difference of three-axis signals is utilized, and multiplexing in time domain can be realized without adding additional devices.

This invention provides a sensing system based on geometric phase transitions in optical fiber Segner rings. The system comprises the following modules: an optical module that generates split signal light; a sensing module that processes the split signal light to sense the physical parameter to be measured; a detection module that obtains measurement data based on the processed signal light; and a data processing module that processes the measurement data to calculate the physical parameter to be measured. This system exploits the phenomenon of sudden geometric phase transitions in optical fiber rings under specific forces to achieve extremely high sensitivity sensing of physical parameters such as external pressure, providing a new technical approach for optical fiber sensing.

The utility model discloses an adaptive tool for automatic dispensing and bonding of an optical fiber ring, which comprises a tool main body, an optical fiber ring piece, a fiber climbing step and a mounting seat, the tool main body is convexly provided with a mounting ring column, the optical fiber ring piece is arranged on the mounting ring column, the tool main body is provided with a tail fiber ring groove along the peripheral side of the mounting ring column, and the tail fiber ring groove is arranged on the mounting ring column. A plurality of positioning columns are further arranged between the tail fiber ring groove and the mounting ring column, avoiding arc grooves are further formed in the tool body, the fiber climbing steps are symmetrically arranged on any two adjacent avoiding arc grooves, fiber outlet steps are arranged at the end, close to the tool body, of the optical fiber ring piece in a protruding mode, and fiber outlet avoiding grooves corresponding to the fiber outlet steps are formed in the mounting ring column. And the mounting seat is embedded and mounted on the optical fiber ring piece. According to the utility model, the tail fiber ring groove and the avoiding arc groove are introduced and matched with the fiber climbing step, so that the damage risk of the tail fiber in the automatic bonding process is obviously reduced, and meanwhile, the mounting seat is tightly bonded with the optical fiber ring piece, so that the bonding effect is ensured, and the rejection rate and the production cost are effectively reduced.

The invention belongs to the technical field of fiber-optic gyroscopes, and particularly relates to an acceleration-based fiber-optic gyroscope vibration error compensation method and an inertial measurement unit. Based on normal strain, optical fiber dielectric impermeability tensor variable quantity, refractive index variable quantity of light in the fast axis direction and phase variable quantity corresponding to a sensitive axis of an optical fiber gyroscope, quantitative relations between the phase variable quantity and the fast axis direction of the optical fiber and between the phase variable quantity and the length of a micro-section optical fiber are established, and the equivalent value of the stress borne by the optical fiber and the phase difference of an optical fiber ring is obtained; the linear relation between the phase difference equivalent value and the angular velocity to be compensated of the fiber-optic gyroscope is determined, the relation of converting the vibration acceleration to the phase to be compensated is established, and the required compensation coefficient is calibrated by combining a sinusoidal vibration test to compensate the vibration error of the fiber-optic gyroscope. According to the invention, vibration error compensation of the fiber-optic gyroscope can be realized without adding extra devices, and the real-time performance and accuracy of error compensation are improved.

The application discloses a fiber refractive index sensor based on a vernier effect, which comprises a broadband light source, an isolator, a first fiber ring resonant cavity, a second fiber ring resonant cavity, a refractive index sensitive unit, a spectrum analysis module and a data processing unit; the input end of the isolator is connected with the output end of the broadband light source; the input end of the first fiber ring resonant cavity is connected with the output end of the isolator; the input end of the second fiber ring resonant cavity is connected with the output end of the first fiber ring resonant cavity; the first fiber ring resonant cavity and the second fiber ring resonant cavity constitute a cascaded fiber ring resonant cavity; the refractive index sensitive unit is connected into the second fiber ring resonant cavity; the input end of the spectrum analysis module is connected with the output end of the second fiber ring resonant cavity; and the input port of the data processing unit is connected with the output port of the spectrum analysis module. The application has the characteristics of high sensitivity, simple structure, high demodulation precision and suitability for mass production.

The invention relates to the field of signal frequency detection in microwave photonics, and discloses a broadband instantaneous frequency measurement receiving system based on Brillouin spectrum compression, which utilizes a dual-tone pump optical carrier signal carried on an intensity modulator and an optical filter to generate a single Brillouin pump source regulated and controlled by unknown radio frequency. A stimulated Brillouin structure narrowed by an optical fiber ring cavity and a single-pumping reference source subjected to phase shift beat frequency, a signal in a 45GHz range can be compressed to a bandwidth of 2.5 MHz, and meanwhile, an original signal can be subjected to optical domain down-conversion processing by a reference source signal, so that a low-frequency signal easy to process electronically is obtained; besides, a double-fiber annular cavity design is adopted, the line width of the Brillouin resonant laser is further compressed through mode matching of interference of light waves in the cavity, test precision reduction caused by frequency spectrum compression is made up, the resolution ratio can reach + / -2.2 MHz, and finally the Brillouin broadband instantaneous frequency measurement receiving technology is achieved.

The application provides a high-precision optical fiber winding system and method, which comprises a winding driving device arranged on one side of a glue tank, the winding driving device is used for driving the rotation of an optical fiber ring, and the optical fiber ring is at least partially immersed in the glue in the glue tank; a transverse moving mechanism is further arranged, the transverse moving mechanism is provided with an optical fiber guide wheel, the optical fiber guide wheel is used for guiding the reciprocating movement of the optical fiber, the moving direction of the optical fiber guide wheel is parallel to the axis of the optical fiber ring; a camera is further arranged, the camera is used for collecting the images of the optical fiber and the optical fiber ring; and a focusing curing laser device is further arranged, the focusing curing laser device is used for curing the glue between the optical fiber and the optical fiber ring. The scheme of winding the ring in the glue can overcome the straightness problem of the optical fiber by using the viscosity of the glue, and overcome the electrostatic repulsion problem between the optical fibers by using the glue. In cooperation with the focusing curing laser device, a low-power light beam can be converged into a focal point light source to perform point curing on the optical fiber through the glue.