4838 results about "Core (optical fiber)" patented technology

The invention provides a time division multiplexing multi-parameter synchronous sensing method and system based on a multi-core optical fiber. A multi-core optical fiber containing three heterogeneous fiber cores is embedded into a measured object, and a distributed reflection grating array forming an inclined angle with the axial direction is inscribed on the surface of each fiber core; energy exchange data between modes of all fiber cores and reflection grating wavelength shift signals are synchronously collected by adopting a time division multiplexing technology, phase difference signals are extracted through a cross correlation algorithm to serve as curvature reference values, dynamic compensation operation is carried out on the wavelength shift data and the phase signals, and accurate strain distribution is obtained after temperature interference is effectively eliminated; a coordinate transformation model is established by combining the three-dimensional geometric parameters of the spiral optical fiber, vector synthesis is performed on the curvature reference and the strain parameters, and accurate reconstruction of the three-dimensional deformation field of the measured object is realized. According to the technical scheme provided by the invention, through multi-core fiber multi-parameter synchronous sensing and three-dimensional coordinate mapping, temperature self-compensation high-precision three-dimensional deformation field real-time reconstruction is realized.

The invention discloses a radioactive measurement data processing method for improving uranium exploration efficiency. The method comprises the following steps: standardized data acquisition: integrating a multi-parameter module, carrying out time-space synchronous acquisition of geological geophysical environment parameters, standardizing protocol alignment data, and supporting three-dimensional modeling; a three-dimensional coupling model is used for processing interference in a sub-module mode, LiDAR-DEM is used for correcting gamma attenuation in the terrain, an optical fiber thermopermeability instrument is used for correcting daughter errors in the hydrology, signal attenuation of a borehole is compensated through a drilling fluid chart, and a space-time continuous interference field is formed; performing dynamic equilibrium coefficient inversion: constructing equilibrium coefficient isoparametric mapping, and inputting rock core, logging and geochemical data into a random forest model; the transfer learning is trained by using historical data, and dynamic inversion and updating of a new area are carried out; intelligent data processing three-dimensional visualization: self-adaptive denoising and spectral shape matching reinforcement abnormity are carried out; constructing a three-dimensional model, and carrying out transfer learning to optimize the precision; the WebGL platform integrates multi-parameter display, virtual drilling functions and high-dimensional data intuitive interpretation.

Disclosed herein is a system, apparatus and method directed to placing a medical instrument in a vasculature of a patient body, where the medical instrument includes an optical fiber having one or more core fibers. The system also includes 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 signals associated with the optical fiber and determining a location of a distal tip of the medical instrument within the patient body. The medical instrument may be steerable in one of various methods including having a predetermined curvature, a distal tip that is magnetic, magnetized, metallic or ferrous and is steerable by an external magnetic device or a having a variable stiffness at a distal tip.

The invention provides a wavelength division multiplexing-fused multi-core optical fiber temperature detection method and system. Wherein the broadband light source is divided into multiple wavelength channels through wavelength division multiplexing, and a wavelength-fiber core mapping relation is established, so that each fiber core of the multi-core optical fiber transmits a single-wavelength optical signal. An optical fiber is integrated to the surface of an object according to a three-dimensional path, each fiber core covers a plurality of sensing sub-areas, the wavelength drift amount caused by temperature is extracted by detecting the attenuation characteristic of an optical signal at a bending position, the wavelength drift amount is converted into a temperature value in combination with a calibration curve, and a temperature gradient model bound with the fiber core position is constructed. And further performing spatial solution by using fiber core spacing, wavelength mapping and transmission time delay parameters, establishing a corresponding relationship between the coordinates of the sensing sub-regions and the temperature, and finally reconstructing three-dimensional temperature field distribution. According to the technical scheme provided by the invention, high-resolution dynamic reconstruction and gradient analysis of a three-dimensional temperature field on a complex surface are realized through wavelength-space two-dimensional decoupling.

A medical device operating as a stylet is described. The medical device can include an insulating layer (or sheath) encapsulating both a multi-core optical fiber and a conductive medium. The optical fiber can include a cladding and a plurality of core fibers spatially arranged within the cladding. Each of the core fibers can include a plurality of sensors distributed along a longitudinal length of that corresponding core fiber and each of these sensors can be configured to: (i) reflect a light signal of a different spectral width based on received incident light, and (ii) change a characteristic of the reflected light signal for use in determining a physical state of the multi-core optical fiber. The conductive medium can provide a pathway for electrical signals detected at a distal portion of the conductive medium. The conductive medium may be concentric to the cladding, but separate and adjust thereto.

An ultrasound imaging system configured to generate a three-dimensional (3D) ultrasound image of a target area. The ultrasound imaging system includes a console including one or more processors and non-transitory computer readable medium having stored thereon one or more logic modules, and an ultrasound probe configured to acquire a plurality of ultrasound images of a target area. The ultrasound probe can be coupled to the console by an ultrasound probe connector having optical fiber including one or more core fibers. The console is configured to generate the 3D ultrasound image by stitching together the plurality of ultrasound images, starting from a point of reference. The point of reference can be the ultrasound probe, one or more anatomical targets, an elongate medical device, a reference magnet, or one or more accelerometers.

The invention provides a real-time breast duct inner wall lesion recognition and positioning method and system based on optical fiber imaging, and relates to the technical field of medical image processing, and the method comprises the steps: obtaining a breast duct inner wall image sequence, extracting a displacement vector field, decomposing the displacement vector field into a dominant frequency and residual components, analyzing the dominant frequency phase to obtain a tissue motion period, an abnormal displacement area is screened from the residual error to establish a tissue anomaly map, an area descriptor is constructed through local wavelet coefficient analysis, a lesion core area is determined through density clustering, and finally the range and the expansion direction of a lesion area are determined through a multi-scale radial basis function and isoline analysis. According to the invention, real-time accurate identification and positioning of the lesion of the inner wall of the breast duct can be realized.

A system, apparatus and method directed to detecting damage to an optical fiber of a medical device. The optical fiber includes one or more core fibers each including a plurality of sensors configured to (i) reflect a light signal based on received incident light, and (ii) alter the reflected light signal for use in determining a physical state of the multi-core optical fiber. The system also includes 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, receiving reflected light signals of different spectral widths of the broadband incident light by one or more of the plurality of sensors, identifying at least one unexpected spectral width or a lack of an expected spectral width, and determining the damage has occurred to the optical fiber based on the identification.

The invention relates to the technical field of hydropower engineering, and discloses a single-core self-healing type looped network networking method and system, and the method comprises the steps: dividing a whole network into a plurality of sub looped networks; each sub-ring network operates independently; the light switch in each sub-ring network adopts an A / B end connection mode; reversely connecting the B end of the last measuring point to the A end of the initial measuring station by using an optical fiber to form a closed physical structure; configuring a protocol on the switch, and controlling a data flow path through the protocol; different sub-ring networks are connected through RJ45 ports, and a CAT5E shielded twisted pair or an Ethernet interface is used; when a certain node or link fails, the protocol automatically triggers a switching mechanism; the master station optical transceiver monitors the states of all nodes in real time and displays fault points through a network management interface. The system comprises a sub-ring network module, a control data flow module and a fault point display module. The problems that a traditional networking method of hydropower engineering is poor in reliability, and self-healing cannot be achieved after an intermediate node is disconnected are successfully solved.

The invention provides a house structure health detection method based on multi-modal data, and belongs to the technical field of house structure health detection, and the method comprises the steps: comprehensively collecting the multi-dimensional monitoring data of vibration, optical fiber strain, acoustic emission, temperature field, deformation and the like of a house structure through an advanced multi-modal sensor array; according to the method, firstly, collected data are preprocessed, material performance testing is carried out, and a material parameter database is established; according to the core technology, a Bayesian network is used for calculating the correlation degree of multi-modal monitoring data and performance test data, an accurate relation function is constructed, and a house structure health state equation set is established. Through deep fitting of historical monitoring data, a highly intelligent structure health assessment model is developed, and key indexes such as damage positioning, temperature abnormity, deformation degree and accumulated damage can be accurately calculated. The technical problem that it is difficult to comprehensively and accurately evaluate the overall health state of the structure through an existing single monitoring means is solved.

A medical device system includes a stylet with an optical fiber and a console operatively coupled to the stylet. The optical fiber can include an electrically conductive concentric tube configured to transmit electrical signals and a plurality of core fibers within the concentric tube. Each of the plurality of core fibers can include a plurality of sensors, and each the plurality of sensors can be configured to reflect a light signal of a different spectral width based on received incident light and change a characteristic of the reflected light signal based on a condition experienced by the stylet. The console includes one or more processors and a non-transitory computer-readable medium with logic that causes operations including providing an incident light signal to the optical fiber and receiving reflected light signals of different spectral widths of the received incident light by the plurality of sensors.

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 discloses a multi-mode optical signal transmission method and device, electronic equipment and a storage medium, and relates to the technical field of computers.The transmitted data stream is divided into a control signal and a data signal, the control signal is a visible light wave band, the data signal is an infrared wave band, and the control signal and the data signal are combined to a single multi-core optical fiber through a combiner; the optical network controller allocates subcarrier resources as required according to the change of network flow in a spectrum dynamic allocation mode to perform data transmission, so that the subcarrier resource allocation adapted to the change of network flow improves the dynamic adaptability, and the allocation of the subcarrier resources as required improves the equipment cooperation efficiency, and in the data transmission process, the data transmission efficiency is improved. Clock synchronization and signal encryption are realized through a quantum key distribution mode, and the security is improved.

The invention provides a high and low temperature alternating environment temperature and pressure mixed signal decoupling method and system based on a multi-core optical fiber. According to the method, temperature and pressure mixed signals are synchronously acquired through phase difference data of a plurality of fiber cores, and multi-channel mixed sensing signals are generated; performing mechanical stress suppression on the multi-core optical fiber by using a thermal expansion adaptive packaging structure to form an anti-deformation optical fiber assembly; carrying out adaptive time slot distribution on the mixed sensing signal based on a time division multiplexing time sequence to generate a synchronous calibration signal; spectral features of the synchronous calibration signals are separated through the spectral analysis technology, scanning parameters are dynamically adjusted in combination with the temperature change rate and the deformation quantity, and temperature and pressure feature data are extracted; and performing decoupling operation on the feature data through the coupling model, and dynamically correcting the model parameter weight based on the deformation quantity feedback data to obtain a temperature parameter and a pressure parameter. According to the invention, the accuracy of synchronous decoupling measurement of temperature and pressure in a high-low temperature alternating environment is realized.

The present disclosure is directed to various embodiments and methods for producing a hollow-core optical fiber. The methods may include heating a hollow-core preform having a cross-sectional area greater than 0.0013 m2. The hollow-core preform may include a substrate with an inner surface. The interior cavity may include a tube in contact with the inner surface. The method may also include drawing the hollow-core optical fiber from the hollow-core preform. The drawing may include elongating the tube to a capillary which may include a contact length with the inner surface of the substrate. The contact length may be a linear distance from a first contact point of the capillary with the inner surface of the substrate to a second contact point of the capillary with the inner surface of the substrate. The contact length may be less than or equal to 20% of a capillary outer diameter.

A method (100) of monitoring and controlling for hydraulic and gas distribution pipeline networks comprises the steps of: providing a pipe (1) of polymeric material for water or gas installations suitable for connection in series with other pipes; Arranging and fixing on the diametral surface of said pipes (1) at least a fiber optic conductor (12) provided with an optical transmitting core (15) and at least a Fiber Bragg Grating FBG (14) sensor; arranging coating means (30) around said pipe for the protection of said fiber optic conductor (12); configuring said optical fiber conductor (12) to be connected to a control unit (20) capable of sending a light signal; and configuring said fiber optic FBG sensor (14) to send a reflected light signal dependent on the variation in size of said pipe (1). The invention also includes a pipe (1) or conduit for hydraulic or gas distribution pipeline networks comprising at least one fiber optic conductor (12) and a distribution pipeline network (10) comprising at least a pipe (1).

An article of manufacture including a fiber optic termination of a small core optical fiber for use with a surgical laser apparatus (the output from which may be characterized by a high M2 factor) or other high-power or high-energy laser (including an appropriate fiber laser) is configured for safe and efficient coupling of light at a large laser focal point and / or to enable the process of coupling of radiant intensities exceeding the silica fiber damage thresholds and / or those ionizing the air if fully focused therein. The termination may include a glass cylinder structured to include a core region and a glass cladding region the ratio of dimensions of which is substantially equal to the ratio of respectively-corresponding dimensions of the employed optical fiber. A method of propagating light through such article of manufacture.

The invention discloses a signal-to-noise ratio improvement method based on a multi-core optical fiber dual-channel distributed acoustic sensing system, and the method comprises the steps: carrying out the light splitting of light emitted by a narrow linewidth laser through a first coupler C1, enabling one path of light to generate a pulse signal through an acoustic optical modulator (AOM), enabling the other path of light to pass through a second coupler C2, and enabling the other path of light to pass through a second coupler C1; the pulse light is divided into two beams of transmission light, the two beams of transmission light are injected into a connected sensing optical fiber through two groups of erbium-doped optical fiber amplifiers (EDFA), two groups of filters, two groups of circulators and a fan-in coupler Fan-in Coupler, and the pulse light is subjected to backward Rayleigh scattering in the sensing optical fiber; based on a dual-channel DAS system, a multi-core optical fiber is used as a sensing optical fiber, three cores and four cores of the multi-core optical fiber are connected in series to form two sensing channels, seven-core space division signals are multiplexed, the equivalent self-noise pressure suppression effect of the seven-core space division signals is analyzed, after noise correlation is removed through a time domain dislocation-frequency domain phase shift method, the signal-to-noise ratio gain can be increased to 8.65 dB, and the signal-to-noise ratio gain can be increased to 8.65 dB. And the detection capability of the system on low-frequency weak signals can be improved.

The invention discloses a high-stability optical fiber connecting device and a using method, and relates to the technical field of optical fiber communication accessories, the high-stability optical fiber connecting device comprises a connector, plug-in assemblies are installed on the two sides of the connector in a plug-in mode, locking heads are installed on the side edges of the plug-in assemblies in a threaded mode, and the two sides of the connector are connected with optical fibers to be connected. The plug-in assembly and the locking head are movably sleeved on the outer surface of the optical fiber to be connected, the outer surface of the connector is fixedly connected with a protective sleeve, and sealing sleeves are installed on two sides of the protective sleeve in a threaded mode. According to the high-stability optical fiber connecting device and the using method, the fiber cores of the to-be-connected optical fibers are extruded and fixed through the spring pieces, the auxiliary balls move on the two sides, and the two sides of the fiber cores of the to-be-connected optical fibers are fixed, so that the connecting stability of the two to-be-connected optical fibers is kept; the outer surface of the to-be-connected optical fiber is sealed, and the connection part of the to-be-connected optical fiber is kept clean, so that the optical fiber connector can adapt to multiple scenes, is flexible and convenient to disassemble and assemble, and is convenient to maintain and replace.

The invention belongs to the field of optical communication, and particularly discloses a hollow-core optical fiber connector and a manufacturing method thereof.The connector comprises a connecting piece, the connecting piece is fixedly installed at the end of a hollow-core optical fiber body, and an insertion hole for the hollow-core optical fiber body to penetrate through is formed in the connecting piece; and the plugging structure is arranged at one end of the connecting piece to physically plug the central channel of the hollow-core optical fiber body, and the plugging structure can allow optical signals transmitted in the central channel to pass through. Based on the structural design of the hollow-core optical fiber connector, butt joint of the two hollow-core optical fibers can be achieved by butt joint of the plugging structures on the two hollow-core optical fiber connectors, it is guaranteed that optical signals are transmitted in the two hollow-core optical fiber bodies, no special equipment needs to be adopted for fusion welding, the connection mode is simpler and more convenient, and the cost is lower. Meanwhile, due to the design of the plugging structure, the problem that water vapor and impurities enter the central channel of the hollow-core optical fiber body to affect optical signal transmission can be effectively avoided.

The invention relates to a hollow-core optical fiber and an optical cable. The hollow-core optical fiber comprises a cladding region and a fiber core region, the cladding region comprises an outer cladding and an anti-resonance layer which are sequentially arranged from outside to inside; the fiber core region comprises a region surrounded by the boundaries of the anti-resonance layer and the outer cladding layer; wherein the anti-resonance layer comprises a plurality of nesting units which are rotationally and symmetrically distributed, each nesting unit comprises a first nesting ring and a second nesting ring nested in the first nesting ring, the first nesting ring is connected to the inner wall of the outer cladding at a first arc length, and the second nesting ring is connected to the inner wall of the outer cladding at a second arc length. And the second nesting ring is connected to the inner wall of the first nesting ring at a second arc length at a position where the first nesting ring is connected to the inner wall of the outer cladding. According to the invention, the problem that the nested ring structure of the hollow-core optical fiber is poor in stability and is easily affected by external stress to deform in the prior art can be solved.

The invention discloses an equivalent self-noise pressure suppression method and device based on a multi-core optical fiber space division multiplexing signal, light emitted by a narrow linewidth laser is split through a first coupler C1, one path of light passes through an acousto-optic modulator AOM to generate a pulse signal, and then the pulse signal passes through a second coupler C2 to generate a pulse signal; the pulse light is divided into two beams of transmission light, the two beams of transmission light are injected into a connected sensing optical fiber through two groups of erbium-doped optical fiber amplifiers (EDFA), two groups of filters, two groups of circulators and a fan-in coupler Fan-in Coupler, and the pulse light is subjected to backward Rayleigh scattering in the sensing optical fiber; based on the dual-channel DAS system, the multi-core optical fiber serves as the sensing optical fiber, three cores and four cores of the multi-core optical fiber are connected in series to form two sensing channels, seven-core space division signals are multiplexed, the equivalent self-noise suppression effect of the seven-core space division signals is analyzed, and the detection capacity of the system for low-frequency weak signals can be improved.

The invention relates to the technical field of communication fault monitoring, in particular to a multi-core optical cable fault online monitoring method based on an optical fiber sensing technology. The method comprises the following steps: firstly, establishing a primary network topological graph according to a direct communication relationship of core nodes, selecting a key service optical cable according to a key service type of the primary network topological graph, and establishing a secondary network topological graph; the second-level link historical performance data of the second-level network topological graph is clustered, and the performance state of the second-level link is judged in real time; calculating a trunk index according to the bandwidth and the throughput and determining a trunk optical cable; performing fault monitoring on the trunk optical cable by using ROTDR equipment, completing super-resolution reconstruction and signal analysis through an SR-LSTM model, positioning a fault position and identifying a fault type; a state space and an action space are constructed through an Actor-Critic reinforcement learning framework in combination with a performance state, a fault position and a fault type, an intelligent agent learns an optimal operation and maintenance strategy, and online fault monitoring of a main optical cable is realized.

The invention discloses a lateral transceiving integrated optical fiber ultrasonic endoscope and a preparation method, and belongs to the field of ultrasonic endoscopic imaging. Comprising a double-clad optical fiber, an excitation film, a dielectric mirror and a sensing film. A part of the inner cladding of the optical fiber is etched into a concave spherical surface and coated with an excitation film, excitation light transmitted in the inner cladding is absorbed, and focused ultrasonic waves transmitted in the lateral direction are excited. A part of an inner cladding layer and a fiber core of the optical fiber are etched, and a Fabry-Perot (Fabry-Perot, F-P) cavity is prepared. When an ultrasonic signal laterally transmitted into the ultrasonic endoscope acts on the sensing film of the cavity, the effective refractive index and the F-P cavity length of the sensing film are changed, and the change is demodulated through signal light in the fiber core to complete ultrasonic detection. According to the lateral transmitting-receiving integrated optical fiber ultrasonic endoscope, the inner cladding is etched and coated with the excitation thin film to excite laterally focused ultrasonic waves, an F-P cavity is formed through lateral etching of the optical fiber to achieve lateral ultrasonic detection, and the lateral transmitting-receiving integrated optical fiber ultrasonic endoscope is formed.

The invention is suitable for the technical field of toll station management, and provides an expressway toll station remote seat guarding and special situation vehicle handling system, which comprises a front-end sensing layer, a rear-end sensing layer and a control layer, the lane equipment comprises a photoelectric sensor, an infrared height limit alarm, a license plate recognition camera, an ETC antenna, an acousto-optic warning ball and a self-service equipment sensor; the network transmission layer is connected with lane equipment, a sentry box cabinet, a machine room core switch and a monitoring center through an optical fiber network; the remote control layer is composed of a remote seat center, and the remote seat center can carry out video monitoring, visual intercom and remote control; and the abnormity alarm layer is used for carrying out early warning on vehicle detention, vehicle height exceeding, ETC passing faults, toll evasion vehicles and handrail abnormity. The vehicle state can be sensed in real time, data are gathered to a remote seat center through a network transmission layer, an information island is broken, and special conditions can be automatically processed.

The invention provides a low-loss hollow-core optical fiber and a preparation method thereof. The hollow-core optical fiber comprises an outer cladding, and a plurality of anti-resonance units and a plurality of cladding supplementing units which are connected to the inner wall of the outer cladding, the anti-resonance units are evenly distributed along the inner wall of the outer cladding at equal intervals, the cladding supplement units are arranged between the adjacent anti-resonance units, and the anti-resonance units surround to form a fiber core area in the outer cladding. The anti-resonance unit comprises an outer anti-resonance tube, a first inner anti-resonance tube, a second inner anti-resonance tube and a substrate; the opening of the substrate faces the center of the outer cladding layer and is tightly attached to the inner wall of the outer cladding layer; the cross sections of the outer anti-resonance tube and the first inner anti-resonance tube are arc-shaped, the openings face the substrate, and the two ends are connected to the two ends of the substrate; the second internal anti-resonance tube is connected to the inner wall of the substrate; the cladding supplementing unit is of a circular or arc-shaped structure. In the drawing process of the optical fiber, the anti-resonance unit of the hollow-core optical fiber has good structural stability.

The invention discloses an optical fiber temperature and pressure sensor based on a spherical lens and a preparation method thereof, and the sensor comprises a filler neck which is internally provided with a pressure medium channel; the sensitive diaphragm separates the pressure medium channel from the internal structure of the sensor, and can sense the pressure change of the pressure medium and convert the pressure change into self deformation; the optical fiber insertion core is used for fixing an optical fiber, so that the front end face of the optical fiber is close to and right faces the sensitive element sensitive diaphragm to form an optical FP cavity so as to realize pressure measurement; the spherical lens is used for converging light beams, improving the coupling efficiency of light entering the optical fiber end face and improving the optical signal intensity; the flat plate lens forms a reference FP cavity and is used for measuring temperature; the diaphragm base is used for mounting and fixing the sensitive diaphragm, the flat plate lens, the spherical lens and the optical fiber insertion core and ensuring that the sensitive diaphragm, the flat plate lens, the spherical lens and the optical fiber insertion core are coaxial and the relative positions are not changed; according to the scheme, the optical fiber has the characteristics of small size, high temperature resistance, high insulating property, high electromagnetic interference resistance and the like, and can be used for a long time in a high-temperature environment to measure the temperature and the pressure at the same time.

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 provides a multi-mode hollow-core anti-resonance optical fiber, and relates to the technical field of optical fibers, and the multi-mode hollow-core anti-resonance optical fiber comprises a hollow outer layer tube and a plurality of cladding capillary tubes arranged on the inner wall of the outer layer tube; each cladding capillary tube comprises a circular tube, an elliptical tube and an anti-resonance plate, and the elliptical tube is nested in the circular tube through the anti-resonance plate and is coaxially arranged with the circular tube. In the technical scheme provided by the invention, the elliptical tube is nested in the circular tube by the anti-resonance plate, and the elliptical tube and the circular tube are coaxially arranged, so that a nested integrated cladding capillary tube is formed, and the multi-mode hollow-core anti-resonance optical fiber with the structure can reduce bending loss and limiting loss of the fiber core in a high-order mode.

The invention discloses semiconductor optical fiber coupling equipment, and relates to the technical field of optical fiber coupling, the equipment comprises a fixing box, a connecting pipe is installed at the center position of one end of the fixing box, and a first fixing block is installed on the side, close to the center position of the fixing box, in the connecting pipe; a butt joint penetrating hole is formed in the center of the first fixing block, a first optical fiber core is installed in the butt joint penetrating hole, a semiconductor laser is installed in the fixing box, the output end of the semiconductor laser right faces the input end of the first optical fiber core, and a lens coupling mechanism is arranged between the semiconductor laser and the connecting pipe. The wide parallel light is changed into the narrow parallel light through the lens group formed by the convex lens and the concave lens, and the final laser width is the same as the section width of the first optical fiber core after the change of the plurality of lens groups, so that the laser emitted by the semiconductor laser is irradiated into the first optical fiber core in parallel, and the optical fiber coupling efficiency is improved.