2472 results about "Core (optical fiber)" patented technology

The invention provides a hollow-core optical fiber cable fiber breakage detection method based on a reference optical fiber and an optical cable, and belongs to the technical field of optical fiber communication. The method comprises the following steps: acquiring monitoring data of a reference optical fiber in a hollow-core optical fiber cable, and performing quality evaluation on the data to generate a signal quality comprehensive score; when the score is higher than a preset threshold value, feature extraction and dynamic weighted fusion are carried out to generate a comprehensive feature vector; outputting a fiber breakage probability by using the fiber breakage state recognition model, calculating a fiber breakage risk value through a prediction model in combination with time sequence data, and obtaining a fiber breakage risk index through a risk fusion algorithm; and finally, matching and executing a hierarchical response strategy according to the risk index. According to the invention, multi-modal data fusion, intelligent state identification and active early warning are realized, and the reliability, precision and operation and maintenance efficiency of broken fiber detection are significantly improved.

The invention relates to the technical field of coal mine telecommunication, and discloses a coal mine underground integrated private network coverage system based on a 5G communication and AR double-transmitting selective-receiving technology, an efficient transmission and baseband processing network is constructed by taking a macro base station as a core on the ground and matching with PTN equipment and a BBU, a 5G micro base station and an RRU are deployed under the ground for a complex environment, and low-loss signal coverage is realized through optical fibers. The AR double-transmitting selective-receiving module ensures that underground data are not lost and have no error through redundant coding and double-link transmission; the edge computing module sinks data processing to the underground, reduces transmission delay and optimizes resource allocation; and the system monitoring and interference suppression unit monitors the operation state in real time, performs multi-stage alarm and resists multipath effect and electromagnetic interference, and finally realizes integration of communication above and under the well, reliability of data transmission, high efficiency of resource utilization and stability of system operation, thereby providing solid communication support for safety production, equipment management and control and personnel scheduling under the coal mine.

The invention discloses a fiber bragg grating femtosecond laser direct writing system and method based on light field regulation and control. The system comprises a femtosecond laser source, a polarization control module, a light beam expanding module, a light field modulation module, a 4f filtering imaging module, an oil immersed objective lens, a precision positioning and optical fiber clamping module, an observation module and a computer control module. The method comprises the following steps: firstly, fixing a standard single-mode optical fiber to be processed on a three-dimensional precision displacement platform; then programmable wavefront modulation is carried out on the femtosecond laser through a light field modulation module, and a multi-focus array is generated; then focusing the multi-focus array into the fiber core through an oil-immersed objective lens to realize one-time parallel inscribing of a plurality of refractive index modulation RIM regions; and finally, the computer control module controls the three-dimensional precision displacement platform to move at a constant speed in the axial direction of the optical fiber, and parallel integrated inscribing of a plurality of FBG structures is completed. According to the invention, the inscribing precision and inscribing efficiency of fiber bragg grating femtosecond laser direct writing are improved.

The invention discloses a multi-core optical fiber multichannel demodulation system for three-dimensional displacement measurement of a mechanical oscillator, which comprises a light source module, a multi-core optical fiber sensing probe, a photoelectric detection module and a signal processing module. A mapping model between multi-channel optical signals and displacement is established, decoupling and high-precision measurement of three-dimensional displacement are realized through a matrix demodulation algorithm, the system takes a multi-core optical fiber as an integrated probe structure, free space optical path alignment is not needed, an optical path is stable, and packaging is simple and convenient; compared with a traditional single-core optical fiber displacement sensing scheme, displacement components of the mechanical oscillator in the three orthogonal directions can be obtained at the same time, and the method has the advantages of being high in measurement precision, high in anti-interference capacity, good in real-time performance, compact in system structure and the like and can be widely applied to the fields of mechanical oscillator displacement measurement, structure health monitoring, precision manufacturing, micro-nano operation positioning and the like.

The invention discloses a high-temperature-resistant flame-retardant carbon fiber cable and an intelligent preparation method thereof, and relates to the technical field of power cables, and the cable is composed of a composite bearing core, a first / second electrical isolation belt, a stranded conductor, an annular composite bearing layer, a high-temperature-resistant main insulator and a low-smoke halogen-free outer sheath. The force bearing core is formed by bundling carbon fiber micro rods, elastic reset layers are arranged between the micro rods, micro-particle friction layers are formed on the outer surfaces of the micro rods, and a stable friction-rebound interface is constructed. A fire-resistant barrier, a phase change microcapsule filling layer and a fiber bragg grating can be arranged, and fire resistance, thermal peak suppression and on-line monitoring are considered. And closed-loop control of pultrusion, surface activation, coating and on-line thickness measurement / friction test is carried out in the manufacturing process. The cable can be operated at 200 DEG C for a long time and at 250 DEG C for a short time, the residual elongation is less than or equal to 0.10%, and light weight, high strength, high temperature resistance, low smoke and flame retardance are realized.

The invention discloses a parallel imaging OCT (Optical Coherence Tomography) system based on a metasurface area array, which relates to the technical field of medical instruments, is small in size and can realize intraocular single-shot area array imaging and a three-dimensional position depth perception function by using metasurface and optical coherence tomography imaging information in a sample tissue with a limited size. According to the technical scheme, a light beam emitted by a laser is divided into two paths through a beam splitter, and the two paths enter a sample arm module and a reference arm module respectively; the sample arm module is a probe and comprises a multi-core optical fiber and a first metasurface; the reference arm module comprises a collimator, a motor and a right-angle reflector; the probe enters a sample tissue, a light beam is focused on the sample tissue and then is backscattered, the backscattered light beam reversely passes through the first metasurface, the multi-core optical fiber, the beam splitter, the second metasurface, the third lens, the grating and the focusing lens and then forms a spectral line beam on the CCD sensor, and the computer reads a signal from the CCD sensor and performs three-dimensional reconstruction imaging on the sample tissue.

A system and method directed to detecting placement of a medical device within a patient body, the system including a medical device including a multi-core optical fiber having a plurality of core fibers. Each of the plurality of core fibers can include a plurality of sensors each configured to reflect a light signal having an altered characteristic due to strain experienced by the multi-core optical fiber. The system can further include logic configured to determine a 3D shape of the medical device in accordance with the strain of the optical fiber. The logic can be configured to define a reference plane for the 3D shape and render an image of the 3D shape on a display of the system in accordance with the reference plane.

The invention provides a short-wave multi-mode hollow-core anti-resonance optical fiber and a preparation method thereof, and relates to the technical field of optical fibers, and the short-wave multi-mode hollow-core anti-resonance optical fiber comprises an outer sleeve and a plurality of anti-resonance units which are arranged along the circumferential direction of the inner wall of the outer sleeve in an array manner; a central cavity enclosed by the plurality of anti-resonance units forms a fiber core area; the anti-resonance unit comprises at least three layers of anti-resonance tubes with different radiuses and two supporting rods arranged between two adjacent layers of anti-resonance tubes; wherein the two supporting rods in each layer are oppositely and obliquely arranged in pairs by taking the radial direction of the optical fiber as a symmetry axis, and the supporting rods on the same side are sequentially arranged along the same radius of the anti-resonance unit. Therefore, the waveguide filter has the advantages of being suitable for the 850 nm wave band, and being capable of supporting more high-order guided modes while giving consideration to low loss.

A distributed composite geotechnical sensor disclosed by the present invention comprises a multi-core cable, an optical fiber sensing member, at least two composite sensing members and a plurality of connectors, the multi-core cable is used for transmitting charge signals, and the optical fiber sensing member and the multi-core cable are arranged in parallel and at an interval and are used for monitoring temperature and stress. The at least two composite sensing pieces are sequentially arranged at intervals along the length direction of the optical fiber sensing piece, are arranged in the same core with the optical fiber sensing piece and are used for monitoring dynamic stress waves or vibration, and the plurality of connecting bodies are respectively arranged at two ends of the composite sensing pieces and are connected with the multi-core cable, the optical fiber sensing piece and the composite sensing pieces. The electric connector is used for electrically connecting the multi-core cable with the composite sensing piece. According to the invention, the problems of relatively single monitoring index and incapability of positioning due to the fact that a traditional piezoelectric geotechnical cable can only monitor external disturbance information and cannot realize distributed monitoring can be effectively solved.

A system, apparatus and method directed to detecting malposition of a medical device within a vessel of a patient, such as an Azygos vein. The medical device can include a multi-core optical fiber including a plurality of core fibers, where each of the plurality of core fibers includes a plurality of sensors is configured to reflect a light signal based on received incident light, and change a characteristic of the reflected light signal for use in determining a physical state of the multi-core optical fiber. The system can include a console having non-transitory computer-readable medium storing logic that, when executed, causes operations of providing a broadband incident light signal to the multi-core optical fiber, receiving reflected light signals, processing the reflected light signals, and determining whether the medical device has entered the Azygos vein of the patient based on the reflected light signals.

The invention discloses a hollow-core fiber fusion coupling loss evaluation method and device, and the method comprises the steps: firstly collecting a cross-section image of a first hollow-core fiber fusion end, enabling laser to pass through the cross-section image, then collecting a light field distribution image of emergent light of the fusion end, and carrying out the fitting, thereby obtaining a nested tube circumcircle and a light field fitting regular polygon; welding the two hollow-core optical fibers, and acquiring a cross-section image of a non-welding end of the second hollow-core optical fiber and a light field distribution image after the laser is introduced to complete the same fitting; and finally, inputting the related geometric parameters before and after welding into a preset evaluation model to obtain welding loss. According to the invention, accurate and real-time evaluation of the welding loss is realized.

The utility model relates to the technical field of optical fiber connectors, and discloses a push-pull device for an optical fiber connector, and the device comprises a housing which is in transmission connection with an insertion core; the tail sleeve is connected with the shell through at least two crossed limiting structures, and the at least two crossed limiting structures are asymmetrically distributed in the direction perpendicular to the axial direction of the push-pull device; when the tail sleeve is pushed and pulled, the shell and the insertion core can move in the axial direction of the push-pull device, and the push-pull tail sleeve is flexible in the axial direction of the push-pull device. The asymmetrically-arranged cross limiting structures can form restraining force distributed in a staggered mode in the radial direction and the axial direction, and the inclination or torsion phenomenon caused by single-side stress of the outer shell and the tail sleeve is effectively restrained. Due to asymmetric distribution, push-pull force can be dispersed and transmitted in different directions, stress concentration or local abrasion caused by a symmetric structure is avoided, the loosening or clamping stagnation phenomenon caused by external force or improper operation is reduced, and the stability and reliability of connection between the tail sleeve and the shell are improved. The utility model further discloses an optical fiber connector.

A system, apparatus and method directed to placing a medical device into a body of a patient, including performing operations of providing a broadband incident light signal to a plurality of core fibers of a multi-core optical fiber, receiving reflected light signals of different wavelengths, and processing the reflected light signals associated with the plurality of core fibers to determine (i) a physical state of the multi-core optical fiber relating to the medical device including the multi-core optical fiber, and (ii) an orientation of the multi-core optical fiber relative to a reference frame of the body. Additional operations include generating a display illustrating the physical state of the multi-core optical fiber based at least on the orientation determined during processing of the reflected light. Typically, the display is a two-dimensional representation of the multi-core optical fiber in accordance with the determined orientation.

The invention provides a light super-soft fire-resistant flame-retardant optical cable and a preparation method thereof. The light super-soft fire-resistant flame-retardant optical cable sequentially comprises a high-temperature-resistant optical fiber, a filling layer, a flame-retardant loose tube, a reinforcing layer, a heat insulation layer and a fire-resistant flame-retardant layer from inside to outside, the fireproof flame-retardant layer comprises the following preparation raw materials in percentage by mass: 55-65% of plasma activated mineral powder, 25-35% of a thermoplastic elastomer base material subjected to irradiation crosslinking treatment, 8-12% of a phosphorus-nitrogen intumescent flame retardant and 1.5-2.5% of a silane coupling agent; the nano mineral powder comprises a magnesium aluminum silicate compound, and the thermoplastic elastomer matrix comprises a blend of SEBS (Styrene-Ethylene-Butylene-Styrene) and TPU (Thermoplastic Polyurethane). The fire-resistant flame-retardant layer forms a ceramic protection layer at high temperature to perform fire-resistant flame-retardant protection and prevent heat transfer, and meanwhile, the heat insulation layer is matched to further prevent heat from being transferred to the cable core, so that the performance of the optical cable is ensured not to be influenced.

The invention discloses a light path system based on a gas-filled hollow-core optical fiber, and the system comprises a spectrum broadening device which comprises a first gas extraction chamber, a gas inlet chamber and a second gas extraction chamber, the first gas extraction chamber and the second gas extraction chamber are located at the two ends of the gas inlet chamber respectively, and the first gas extraction chamber and the gas inlet chamber are separated through a first sealing part; the second air exhaust chamber and the air inlet chamber are separated through a second sealing piece; the spectrum broadening device is internally provided with a hollow-core optical fiber and is provided with at least one through hole penetrating through the pipe wall of the hollow-core optical fiber, the two ends of the hollow-core optical fiber penetrate through the first sealing piece and the second sealing piece respectively so that the two ends of the hollow-core optical fiber can be communicated with the first air suction chamber and the second air suction chamber respectively, and the through hole is located in the air inlet chamber. The two ends of the hollow-core optical fiber are subjected to air exhaust, so that the ionization rate and the self-focusing effect generated when the laser is output after the spectrum of the inflated hollow-core optical fiber is broadened can be remarkably reduced, the requirement for improving the power input of the laser is met, and a light path system can bear higher laser monopulse energy compression.

A method of inspecting a Fiber Array Unit (FAU) in a co-packaged optics application using an inspection apparatus, includes: Positioning the FAU in the apparatus. Utilizing a high-resolution CCD imaging system to capture detailed images of the FAU. Employing an IR CCD to assess the core pitch position of the FAU. Measuring the quality of output beams from the FAU's optical fibers using a beam profiler. Actively aligning the FAU using left and right 6-axis alignment units.

A system, apparatus and method directed to determining a temperature within a patient body, including an optical fiber with one or more core fibers. The system can include a console having non-transitory computer-readable medium storing logic that, when executed, causes operations of providing an incident light signal to the optical fiber, receiving a reflected light signal of the incident light, processing the reflected light signal to determine a temperature within the patient body near a measurement region. The method may include determining a location of a distal tip of the optical fiber within the patient body at least based on the temperature.

There is described an optical fiber comprising a core with non-fungible noise elements along a length thereof, wherein the non-fungible noise elements generate in use a Physical Unclonable Function (PUF). There is further described an object including the present optical fiber and uses of the present optical fiber in applications such as authentication, encryption and zero trust security. There is also described an apparatus for introducing non-fungible noise elements along a core of a bundled optical fiber, a method for extracting a digital signature of a Physical Unclonable Function (PUF) generated by introduced non-fungible noise elements in the present optical fiber and a network integrating the present optical fiber.

The invention relates to a cable early-stage fault parameter extraction method and system fusing temperature rise process data, and relates to the technical field of cable fault monitoring, and the method comprises the steps: receiving multi-node temperature rise data uploaded by a temperature measurement optical fiber for a to-be-detected cable in a conduction state, comparing the multi-node temperature rise data with a cable rated condition, extracting deviation information with a standard temperature rise curve, and calculating the temperature rise process data of the to-be-detected cable; setting first and second fault characteristic indexes; drawing up a fault parameter extraction atlas in combination with the deviation information and the first and second fault characteristic indexes; and according to the attenuation coefficient, the early fault calorific value under different equivalent insulation resistances is taken as a core association feature, a fault influence range is evaluated, and a dynamic threshold adjustment rule is used for fault reminding. The cable fault detection method solves the problems that in traditional cable fault detection, early fault feature capture is not sensitive, missing detection is prone to occurring, and the fault judgment accuracy is insufficient due to the fact that the cable operation state and environmental factors are not fully combined.

The utility model discloses a novel longitudinal watertight optical fiber connector, which comprises a connector plug and a connector socket, the connector plug comprises a plug shell and a threaded sleeve rotationally sleeved on the outer surface of the plug shell, the outer surface of the plug shell is provided with a step block, a clamping ring is arranged between the step block and the threaded sleeve, and the clamping ring is connected with the plug shell through a connecting rod. A plug base with a pin assembly is arranged in the plug shell, a check ring is arranged between one end of the plug base and the plug shell, and a sleeve assembly is arranged at the other end of the plug base. The step block arranged on the outer surface of the plug shell can prevent the threaded sleeve from falling off in the butt joint process of the connector plug and the connector socket, and the step block can shake back and forth in cooperation with the check ring, so that the insertion and separation operation of the connector is smoother, the problem that the watertight connector is not easy to separate is solved, and the service life of the watertight connector is prolonged. And the end face of the ceramic ferrule can be cleaned conveniently.

A medical system is disclosed that includes a medical device having an optical fiber, and an interchangeable connection component configured to provide a fiber optic connection between the medical device and capital equipment. The connection component is configured to facilitate cleaning and / or polishing of fiber optic interfaces include therewith. The connection component is also configured for replacement by a medical technician while the capital equipment is operational. The capital equipment may include one or more of an optical interrogator, a patch cable, a medical probe, an ultrasound machine, a display, a magnet sensor, or an electro-cardiogram (ECG) machine. The medical device may include an elongate member configured for insertion within the patient body, where the optical fiber core extends along a length of the elongate member.

The invention relates to a damaged point monitoring system and method for a hollow-core optical fiber, computer equipment, a medium and a product, and relates to the technical field of telecommunication operation and maintenance. The system comprises a sensing sending module and a sensing receiving module, wherein the sensing transmitting module is used for transmitting a target optical pulse coding signal corresponding to a current monitoring mode to a to-be-detected hollow-core optical fiber; the monitoring mode comprises an on-line monitoring mode and an off-line monitoring mode, and the wavelength bands of the target optical pulse coded signals corresponding to the on-line monitoring mode and the off-line monitoring mode are different; and the sensing receiving module is used for receiving the backward Rayleigh scattering light reflected by the to-be-detected hollow-core optical fiber and positioning a damaged point of the to-be-detected hollow-core optical fiber according to the backward Rayleigh scattering light and the layout path information of the to-be-detected hollow-core optical fiber. The system can accurately position the damaged point of the hollow-core optical fiber.

The invention provides an intelligent inspection system based on a robot and a camera, and relates to the field of intelligent manufacturing, the system adopts a four-layer architecture including a sensing layer, a transmission layer, a platform layer and an application layer, the sensing layer is composed of a fixed camera and an intelligent inspection robot; the transmission layer adopts optical fibers and 5G hybrid networking; the platform layer is integrated with a distributed server cluster, a data platform and an AI inference engine; the application layer provides a Web and mobile terminal management interface. The core of the system adopts a plurality of AI algorithms, including an instrument reading recognition algorithm based on Hough transform and CRNN, a leakage detection algorithm combined with background difference and an optical flow method, and a multi-device collaborative scheduling algorithm based on reinforcement learning, and constructs a digital twinborn inspection scene of virtual-real mapping. According to the invention, automatic and intelligent inspection and visual monitoring of power plant instruments, pipelines, power distribution rooms and other areas are realized, the inspection efficiency and accuracy are effectively improved, and the labor cost and the safety risk are reduced.

The invention discloses an optical fiber twinning controllable vernier hydrogen sensor and a detection method, and belongs to the technical field of optical fiber sensing, the optical fiber twinning controllable vernier hydrogen sensor comprises a single-mode optical fiber, a femtosecond laser direct writing grating, a Fabry-Perot interferometer and a Pd / WO3 hydrogen sensitive film; the single-mode optical fiber comprises an optical fiber core and an optical fiber cladding, the femtosecond laser direct writing grating is prepared in the optical fiber core, the Fabry-Perot interferometer is composed of a reflecting surface 1 and a reflecting surface 2 which are relatively parallel to each other, the Pd / WO3 hydrogen sensitive film is coated on the inner side of the reflecting surface 2, and the femtosecond laser direct writing grating and the Fabry-Perot interferometer are arranged in series; the optical path of the Fabry-Perot interferometer is modulated through the interaction of the Pd / WO3 hydrogen sensitive film and hydrogen, interference spectrum wavelength drift is triggered, temperature compensation is achieved in combination with the temperature response of the femtosecond laser direct writing grating, and hydrogen concentration sensing is completed. The method is suitable for hydrogen leakage detection in industrial environments, energy equipment and other scenes.

The invention discloses a high-sensitivity double Fabry-Perot interference hydrogen sensor resistant to temperature and humidity interference, and belongs to the technical field of optical fiber sensing. A modular integrated design is adopted, and the core comprises double Fabry-Perot interferometers which are connected in series and are respectively a temperature compensation unit FPI-1 and a hydrogen sensing unit FPI-2, and a matched software controllable vernier processing module; the FPI-1 realizes temperature real-time compensation by filling PDMS in an open microcavity, and the FPI-2 adopts a PDMS / Pd-WO3 composite material as a hydrogen sensitive layer, and has wide humidity range anti-interference capability through structural optimization; the weak hydrogen signal is amplified through Fourier transform filtering, sine function fitting, twin interference spectrum construction and vernier effect. According to the invention, precise detection of ultra-trace hydrogen in a complex temperature and humidity environment is realized, and the temperature and humidity interference resistance is high.

The utility model discloses a hollow-core optical fiber confinement gas excitation and collection device. The device comprises a laser system, an optical focusing system, an ion separation collecting electrode, a hollow-core optical fiber and a metal steam supply system, a laser system and an optical focusing system are arranged near one end of the hollow-core optical fiber, a metal steam supply system is arranged near the other end of the hollow-core optical fiber, laser emitted by the laser system is focused on a laser incidence end face through the optical focusing system, and the metal steam supply system is connected with the metal steam incidence end face and outputs metal steam into the hollow-core optical fiber. An ion separation collecting electrode is arranged near the periphery of the laser incident end surface; during collection, the laser system emits laser, the hollow-core optical fiber serves as a working cavity, the metal steam supply system conveys metal steam, the metal steam and the laser collide with each other in the working cavity, metal atoms absorb photon energy and are excited into metal ions, and the ion separation collection electrode separates and collects the metal ions.

The invention discloses a quick response capability detection device for a high-precision electromagnetic valve, and relates to the technical field of electromagnetic valve detection, the quick response capability detection device comprises a positioning frame and a transmission table, a sliding rod arranged on the positioning frame is sleeved with the transmission table in a sliding connection mode, and valve body positioning tools are fixed to the side wall of the transmission table at equal intervals through bolts; the miniature optical fiber sensing module and the high-frequency response pressure sensor are integrated, synchronous measurement of valve element displacement and outlet pressure is achieved, the limitation of single parameter measurement is overcome, meanwhile, the miniature optical fiber probe is adopted for detecting the valve element displacement through the miniature mounting hole in the valve body, the influence on valve element movement is reduced, and the measurement precision is improved. The problem that the structure of the electromagnetic valve needs to be greatly changed in a traditional direct detection method is avoided, the drift diameter of a flow channel is adjusted through rotation of a layer sleeve block in the phase change regulation and control mechanism in the initial detection stage, multi-working-condition simulation from low-pressure large flow to high-pressure small flow is achieved, and the detection condition is closer to the actual working environment of the electromagnetic valve.

The invention discloses a seesaw type optical fiber end face weak force sensor which comprises a seven-core optical fiber, a seesaw type additive structure and an interference light beam. The seven-core optical fiber is composed of a central main fiber core and six symmetrically-distributed auxiliary fiber cores. The seesaw-type additive structure is composed of a short vertical beam, a vertical beam on a central main fiber core of the seven-core optical fiber and a cross beam connected to the vertical beam, and the whole structure is prepared through the two-photon polymerization technology of a femtosecond laser processing platform; the interference light beam is composed of two light beams in an interference cavity, wherein the lower surfaces of the left side and the right side of the seesaw-type additive structure are aligned with the end faces of two auxiliary fiber cores on the left side and the right side of the seven-core optical fiber. According to the invention, a two-photon polymerization technology is used to build an additive structure on the end face of the seven-core optical fiber, so that the sensing structure is small in overall size and is suitable for application in a limited space; the Fabry-Perot interferometers on the two sides of the sensing structure are connected in parallel to form an optical dynamic vernier structure, the sensitivity is improved through differential amplification of weak mechanical disturbance, and the anti-interference capability is enhanced through common-mode denoising.

The invention provides a film lithium niobate chip optical fiber coupling machine vision alignment control method, which comprises the following steps: acquiring a high-resolution image of a waveguide end surface of a film lithium niobate chip, and extracting a multi-structure vision representation set from the high-resolution image; determining an effective action area of the mode field by combining the emergent light intensity distribution and geometric constraint provided by the boundary of the side wall; calculating an energy weighted center based on the light intensity distribution in the effective action area of the mode field, and mapping the energy weighted center to an assembly platform coordinate system to obtain an optical coupling reference center for alignment; with the optical coupling reference center as a target, the position and posture of the optical fiber are adjusted through feedback control, so that the center of an optical fiber core approaches and aligns to the optical coupling reference center; after alignment is completed, the stable optical fiber pose is evaluated and locked, the final coupling pose and performance indexes are output, the problem of decoupling of the visual reference and the real optical reference can be solved, and low-loss and high-stability coupling between the thin-film lithium niobate chip and the optical fiber is achieved.

The invention discloses an airtight packaging structure and a hollow-core optical fiber transmission system.The airtight packaging structure comprises a packaging shell, an air pressure adjusting device, an air pressure monitoring device and a control device, the packaging shell is provided with an air cavity, a packaging hole and a communicating hole, and the packaging hole and the communicating hole are both communicated with the air cavity; the air pressure adjusting device is provided with an air vent communicated with the communicating hole, the air pressure monitoring device is connected with the cavity wall of the air cavity so that the air pressure of the air cavity can be monitored through the air pressure monitoring device, and the air pressure monitoring device and the air pressure adjusting device are both electrically connected with the control device. The control device is used for receiving the real-time air pressure value monitored by the air pressure monitoring device and controlling the air pressure adjusting device to adjust the air pressure of the air cavity based on the real-time air pressure value. According to the airtight packaging structure, the pressure of the inner cavity of the hollow-core optical fiber can be maintained, water vapor, air and the like in the external environment are prevented from permeating into the inner cavity of the hollow-core optical fiber, and the stability of a communication system is guaranteed.