277 results about "Fiber ring" patented technology

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 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 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.

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 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 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.

The application relates to the technical field of fiber-optic gyroscopes, in particular to a preparation method of a two-in and two-out mirror image fiber-optic ring, which comprises the following steps: measuring two optical fibers with required lengths; marking the endpoints and the midpoints of the two optical fibers respectively; calculating a winding sequence change point and marking the same on the two optical fibers respectively; winding the two optical fibers on a fiber-optic ring skeleton in a mirror image symmetrical manner alternately by adopting a quadrupole symmetrical winding method until the winding sequence change point; changing the winding sequence of the two optical fibers; repeating steps d and e until the endpoint marks at the two ends of the optical fibers; and leading out four optical fiber tail fibers from the fiber-optic ring skeleton and fixing the same. According to the preparation method of the two-in and two-out mirror image fiber-optic ring, the two optical fiber rings have a mirror image relationship in space, so that the temperature phase errors generated by the two wound optical fiber rings are consistent, the phase errors caused by temperature changes in the Shupe effect can be compensated after joint signal processing, and the precision of the fiber-optic gyroscope is further improved.

The application provides a multi-stage coaxial mechanism for optical fiber winding, a base frame, and a triple shaft structure on the base frame. The triple shaft structure comprises a triple shaft rotating base connected with the base frame, a driven concentric outer shaft, a driving shaft and a driven concentric inner shaft which are sequentially sleeved on the inner side of the triple shaft rotating base and can synchronously rotate. A driven unlocking mechanism is arranged on one side of the triple shaft structure and is used for switching the synchronous or independent rotating state of the driven concentric outer shaft, the driving shaft and the driven concentric inner shaft, thereby solving the problem of rotating mode switching of the optical fiber ring tool skeleton, the fiber separating disc and the optical fiber guide assembly.

A communication method related to the field of optical fiber communication and applied to a processor (22) in a train car. The processor (22) is connected to an optical fiber ring network, and the processor (22) performs communication data interaction with a train communication device in a car and then performs communication data interaction in the form of an optical signal with the optical fiber ring network to implement communication between the train communication devices in different cars. Data transmission is performed via an optical fiber instead of a cable, so that communication data is not susceptible to loss and is immune to electromagnetic interference, thereby improving the communication quality of the train communication devices.Furthermore, the communication data of the multiple train communication devices is converted into optical signals and combined into a light beam for transmission, so that only one optical fiber ring network is required for the simultaneous data transmission of the multiple train communication devices without establishing multiple communication networks, thereby reducing the complexity of the in-train wiring environment and reducing the overall weight of the train. Furthermore, a communication device and a communication system, as well as a train, are provided.

The utility model relates to the field of optical fiber interference sensors, and discloses an M-Z interference sensor with a small excitation group velocity dispersion difference mode structure. Comprising a light injection single-mode optical fiber, a small-core-diameter step multimode optical fiber, a wide annular core optical fiber, an annular core optical fiber, a gradient refractive index multimode optical fiber, a large-core-diameter step multimode optical fiber and a light receiving single-mode optical fiber which are connected in sequence. The wide annular core optical fiber comprises a third quartz cladding and a third quartz fiber core, and the third quartz fiber core annularly wraps a third quartz layer; the annular core optical fiber comprises a fourth quartz inner wrapping layer, a fourth quartz fiber core and a fourth quartz outer wrapping layer, the fourth quartz inner wrapping layer is annularly wrapped by the fourth quartz fiber core, the fourth quartz fiber core is annularly wrapped by the fourth quartz outer wrapping layer, and the optical fiber radial refractive index distribution index of the gradient refractive index multimode optical fiber is 1.95-2. According to the scheme, the annular core optical fiber is used for injecting light to the gradient refractive index multimode optical fiber, two modes with smaller group velocity dispersion difference can be excited to interfere, and the sensitivity of the sensor is improved.

This invention relates to fiber optic ring assemblies, specifically to a fiber optic ring assembly and a sealing process method to improve its long-term stability. This addresses the technical problems of existing fiber optic ring assemblies, such as the inability to guarantee the accuracy performance of the fiber optic ring when exposed to air, poor sealing performance at the small holes in the fiber optic ring shell, and slippage of the fiber optic ring and pigtails from the fiber optic ring shell due to weak adhesive. The invention includes a fiber optic ring shell and a fiber optic ring. The fiber optic ring shell includes a fiber optic ring frame and a cover plate, which are sealed together. The fiber optic ring is installed within the cavity formed by the fiber optic ring frame and the cover plate. The invention also includes a flexible absorbent material covering the fiber optic ring. The flexible absorbent material fills the space within the cavity of the fiber optic ring shell, excluding the space occupied by the fiber optic ring. A channel is provided on the fiber optic ring shell connecting the cavity to the outside. At least one pigtail of the fiber optic ring extends from this channel. The channel is sealed.

This invention relates to a lightweight, miniaturized 3S configuration triaxial integrated fiber-MEMS inertial measurement unit, belonging to the field of measurement devices. It includes a base cover, a power supply and detection board assembly located on the top of the base cover, a light source assembly located above the power supply and detection board assembly, a MEMS assembly mounted above the light source assembly, a base fixed to the base cover, fiber optic ring assemblies fixed to the base, and a reference mirror fixed to the top of the base. The power supply and detection board assembly, the light source assembly, and the MEMS assembly are all arranged inside the base. The three fiber optic ring assemblies are evenly distributed on a conical surface with an outer half-cone angle of 54.74° and a bottom projection of 120°. The light source assembly shares a light source with the three fiber optic ring assemblies via a 1*3 coupler. This invention eliminates the unnecessary space occupied by the traditional three independent light source configuration, reduces the overall volume, and improves optical path consistency and system stability. It can meet the engineering requirements of commercial satellite platforms for the miniaturization and mass production of inertial measurement components.

The invention discloses a long-distance distributed Brillouin optical frequency domain analysis sensing system based on an Er-doped optical fiber, the output light of an electro-optical modulator is connected with a second optical fiber coupler and is divided into two beams which are respectively used for sensing and feedback regulation, and the output light of the electro-optical modulator after feedback regulation is connected with the input of a third optical fiber coupler; the output of the gain compensation controller is connected with the other input of the third optical fiber coupler, the output of the third optical fiber coupler is connected with the input of the fourth optical fiber coupler, one output of the fourth optical fiber coupler is connected with the input of the gain compensation controller, and the other output is connected with the input of the optical fiber isolator; output light of the optical fiber isolator serves as final detection light to enter the first to-be-detected optical fiber; output light of the scrambler and output light of the second laser are input into a first erbium-doped optical fiber together through a wavelength division multiplexer, pump light enters a first optical fiber circulator after being amplified by the first erbium-doped optical fiber, one path of output light is connected to a second to-be-measured optical fiber loop provided with a second erbium-doped optical fiber, and the other path of output light is connected to input of a second circulator; one path of output of the second circulator is connected to the optical fiber reflector, and the other path of output is connected to the photoelectric detector to convert optical signals into electric signals.

The utility model discloses a kind of efficient optical fiber ring ultraviolet curing box, including box and supporting mechanism, box is closedly arranged, box is equipped with box door, multiple ultraviolet lamps are evenly spaced and arranged in ring in box;Supporting mechanism includes base disc, multiple supporting plates and power component, base disc is coaxially arranged in the lamp ring formed by all ultraviolet lamps, power component is arranged in the middle of base disc, all supporting plates are arranged around power component in ring, to form supporting ring, supporting plate and base disc are radially slidingly fitted along supporting ring, power component can make all supporting plates synchronously slide on base disc.It can solve the problem of unstable clamping during the curing process of optical fiber ring, and local curing abnormalities are prone to occur due to clamping and fixing.

The application provides a burst high-repetition-frequency tunable pulse cluster laser generating device, and belongs to the technical field of high-power microwave. The device comprises a pulse cluster laser seed module, an active optical fiber ring module, a multi-stage optical power amplification module and a multi-channel signal generation module. The technical scheme of the application realizes burst replication of the pulse cluster through the active optical fiber ring module, and outputs high-repetition-frequency tunable burst pulse cluster laser in combination with a pre-compensation technology. The output laser pulse is multi-parameter adjustable, the thermal accumulation effect of the high-repetition-frequency laser is reduced, and the continuous output problem of the instantaneous high-power laser in different application occasions is solved.

The application provides a special mirror ring structure-based interferometric fiber-optic gyroscope, which comprises a light source, a polarizer, a coupler, two loopers, two Y waveguides, a signal generator, a 2-in-2-out mirror fiber ring, two photoelectric detectors and a signal joint demodulation module; wherein the two equal-length polarization maintaining optical fibers of the 2-in-2-out mirror fiber ring are both fused at the middle point with the fast axis at 90 degrees, and when each polarization maintaining optical fiber is fused with the Y waveguide tail fiber, one end is fused with the fast axis at 0 degrees and the other end is fused with the fast axis at 90 degrees. In the fiber-optic gyroscope, the light is no longer sent into two polarization channels of the same fiber ring through a polarization beam splitter and combiner, but is fused with two spatial mirror fiber rings at 0 degrees and 90 degrees through two Y waveguides, so that the radial magnetic field phase error caused by the Faraday effect is suppressed, and the temperature phase error caused by the Shupe effect can be compensated by joint demodulation of the electric signals of the two photoelectric detectors.

The application provides a series type optical fiber winding device, which comprises a frame body, the frame body is provided with a table board, the table board is provided with a translation sliding table assembly, the translation sliding table assembly is provided with a fiber placing assembly, a glue applying assembly and a fiber arranging rod assembly, one side of the translation sliding table assembly is provided with a fiber collecting mechanism and a skeleton end connecting assembly, the fiber collecting mechanism is internally provided with a rotatable fiber collecting driving shaft, one end of the fiber collecting driving shaft is connected with one end of an optical fiber ring skeleton, and the skeleton end connecting assembly is connected with the other end of the optical fiber ring skeleton, so that the problem that the series type narrow and long shaft optical fiber ring skeleton is difficult to be fixed on the outer side of the rotating shaft is solved.

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

The invention relates to an optical fiber gyroscope testing system. The system comprises a light source, a coupler with at least four ends, a sensitive light path, a reference light path, and a subtracter, an A / D module, an FPGA, a D / A module and a waveguide driver which are connected in sequence, light emitted by the light source is divided into two paths by the coupler and then enters the sensitive light path and the reference light path respectively; the sensitive light path comprises a photoelectric modulator, a sensitive optical fiber ring, a coupler, a first photoelectric detector and a first pre-amplifier which are connected in sequence; the output end of the waveguide driver is in communication connection with the photoelectric modulator; the reference optical path comprises a reference optical fiber ring, a second photoelectric detector and a second pre-amplifier which are connected in sequence, and a compensation optical fiber with a preset length is connected in the reference optical path, so that the optical paths of the sensitive optical path and the reference optical path are equal; the output ends of the first preamplifier and the second preamplifier are respectively connected with the input end of the subtracter; and the subtracter is used for subtracting the signal output by the first preamplifier from the signal output by the second preamplifier so as to obtain a noise-removed photoelectric signal. According to the invention, the light source intensity noise can be cancelled, and the rotating speed demodulation precision is improved.

A gyroscope shell is provided with a left cavity and a right cavity, a light source module and a power module are installed in the left cavity, an optical module is installed in the right cavity, and a curved surface groove for an optical fiber to pass through is formed between the two cavities; the optical module comprises a ring base, an optical fiber ring, a ring shell, a coupler and a Y waveguide; the optical module is reversely mounted through a screw arranged at the bottom of the gyroscope shell; the ring base and the ring shell are made of magnetic shielding materials to overcome the influence of a magnetic field on the optical fiber ring, the circuit control mainboard is fixedly connected to the ring shell, and the power panel is detachably installed on the power panel bracket. The optical fiber gyroscope provided by the invention can overcome the influence of temperature change, magnetic field and vibration impact on measurement precision and stability, and the reliability of the optical fiber gyroscope is effectively improved.

The invention discloses a small frameless optical fiber ring assembly capable of reducing stress and a preparation method thereof, and solves the problems that extra stress is generated in the fixing process of a frameless optical fiber ring and a support, and the size is increased after a magnetic shielding outer cover is additionally arranged. The invention discloses a small frameless optical fiber ring assembly capable of reducing stress. The small frameless optical fiber ring assembly comprises an optical fiber ring support made of a soft magnetic alloy material, an annular cover plate and a frameless optical fiber ring, the optical fiber ring support is of an integrally-formed circular-ring-shaped structure with an opening in one end, and a containing cavity is defined by a bottom wall, a first vertical wall and a second vertical wall. The first vertical wall is provided with a fiber outlet hole, the second vertical wall is provided with a circular mounting table, the mounting table is provided with a mounting hole, and the bottom wall is provided with a groove used for accommodating an optical fiber ring exchange layer; the open end of the optical fiber ring bracket is connected with a cover plate; and the frameless optical fiber ring is arranged in the accommodating chamber, is matched with the bottom wall and then is adhered to the bottom wall, and the other wall surfaces are in clearance fit with the inner wall surface of the optical fiber ring bracket and the cover plate.

The invention discloses an event database-based optical fiber ring network fault diagnosis method and system, and the method comprises the steps: collecting the historical operation data and fault event information of an optical fiber ring network, including optical power, bit error rate, polarization state parameters, OTDR waveforms and fault processing records, and building an event database; constructing a convolutional neural network model, and performing fault feature learning and model training on the samples in the event database by using the convolutional neural network model to obtain a trained optical fiber ring network fault diagnosis model; and inputting fault data acquired in real time into the trained optical fiber ring network fault diagnosis model, performing feature matching with historical samples in the database, and identifying fault types and causes on line to obtain a diagnosis result. And the operation and maintenance efficiency, the reliability and the intelligent level of the optical fiber ring network are obviously improved.