157 results about "Optical fiber communication systems" patented technology

The invention relates to the technical field of intelligent communication, and discloses an end-to-end optimization method, a signal constellation geometry and probability joint shaping optimization method in an end-to-end intelligent communication system, and a communication device based on a neural network. According to the method, a transmitter is constructed by using a neural network, and a received signal passes through a two-stage equalization processing system to form an end-to-end optimization framework without assistance of a channel model. The transmitter adopts a modular design, can realize joint optimization of constellation probability shaping (PS) and geometric shaping (GS), and performs joint updating on all trainable parameters of the system based on a total loss function containing an equilibrium error and a decoding error through a back propagation algorithm. According to the invention, computing resources are effectively saved; the two-stage equalization system can accurately compensate channel damage, the realized PS and GS joint optimization can significantly improve the performance of the communication system and reduce the bit error rate, and the method has good performance advantages and practical value in an actual optical fiber communication system.

The invention belongs to the technical field of quantum information, and particularly relates to a quantum entanglement and classical signal common-fiber transmission device based on a hollow-core optical fiber. According to the device, the characteristics of low loss and weak non-linear effect of the hollow-core optical fiber are utilized, the quantum entanglement two-photon pair and the classical optical signal are transmitted in the hollow-core optical fiber in a co-fiber mode through the wavelength division multiplexing technology and the polarization optimization strategy, the system can tolerate the classical signal with the higher communication rate, and the lower quantum signal bit error rate is allowed. The quantum entanglement and classical signal common-fiber transmission device designed through the method can be widely applied to the fields of quantum key distribution, quantum teleportation, quantum clock synchronization, distributed quantum calculation and the like compatible with a classical optical fiber communication system.

The invention provides an optical fiber transmission receiving signal prediction model training method, a prediction method and equipment, and relates to the technical field of transmission, and the training method comprises the steps: generating a training sample corresponding to a transmitting signal according to the transmitting signal generated by a transmitting end in a continuous spectrum nonlinear frequency division multiplexing system in advance, and training a neural network model based on the training sample to perform mixed domain feature extraction, multi-scale processing and attention feature extraction based on a peak perception attention mechanism on the training sample to obtain received signal prediction result data and optimize the neural network model so as to train the neural network model as an optical fiber transmission received signal prediction model. According to the method and the device, the received signal in the continuous spectrum nonlinear frequency division multiplexing system can be predicted, the accuracy of performing received signal prediction by adopting the trained optical fiber transmission received signal prediction model can be improved, and further the research and development period of the modeling process of the optical fiber communication system and the computing resource consumption of research and development equipment can be reduced.

The utility model relates to the technical field of optical fiber distribution, and discloses an optical fiber distribution frame, which comprises a main body assembly and a supporting transverse plate, the wire clamp assembly is arranged on one side of the supporting transverse plate and comprises a clamping piece, the clamping piece is located on one side of the supporting transverse plate and comprises a fixing plate, a connecting plate, an annular block, a movable column, a rotating plate, a clamping block, a connecting block and an arc-shaped plate, the fixing plate is fixed to the supporting transverse plate, the connecting plate is arranged on one side of the fixing plate, and the annular block is arranged on the other side of the fixing plate. And the annular block is fixed on one side of the connecting plate. The beneficial effects of the utility model are that by adopting the design of the annular collecting groove, one optical fiber cable corresponds to one groove, the mutual winding and interference among the optical fiber cables are effectively avoided, the position of each cable can be fixed by pressing the button, the optical fiber is prevented from deviating, the stability and reliability of an optical fiber communication system are improved, and the service life of the optical fiber communication system is prolonged. And meanwhile, the locking state of a certain wire can be unlocked independently, so that the maintenance of the optical fiber is facilitated.

The invention provides a while-drilling optical fiber communication system and method, and relates to the technical field of drilling engineering, and the while-drilling optical fiber communication system comprises a wellhead mechanism, a connection mechanism and a pay-off mechanism; the wellhead mechanism comprises a wellhead drill floor and a wellhead drill rod section; the connecting mechanism is located above the well mouth mechanism, can move up and down and comprises a fixing frame, a driving rod, a connecting drill rod section, a cable coiling device, a photoelectric sliding ring and a rigid connecting rod. And the upper end of the continuous drill rod section is detachably connected with the driving rod and the lower end is detachably connected with the wellhead drill rod section. A first optical fiber is arranged in the rigid connecting rod, and the rigid connecting rod is connected with a second optical fiber of the pay-off mechanism through a wet joint; the pay-off mechanism comprises a wire bin and an anchoring device, the top of the wire bin is provided with a wet connector connected with the second optical fiber, and the anchoring device fixes the wire bin and the continuous drill rod section. Through a three-stage optical fiber transmission path of'photoelectric composite cable-rigid connecting rod-wire cabin ', optical fiber communication maintenance during drill rod connection is realized, continuity and reliability of optical fiber communication during rotary drilling are ensured, and the problem of communication interruption is solved.

The invention relates to an optical fiber beam expanding contact piece and a hollow-core optical fiber connector, and belongs to the field of optical fiber connectors, the optical fiber beam expanding contact piece comprises a hollow-core optical fiber and a light transmission medium which is arranged in front of the hollow-core optical fiber and can output beam expanding collimated light, the light transmission medium is arranged in a connector pin, and the light transmission medium is a medium with a focusing function. The connector pin is mounted on the positioning piece, and the positioning piece is used for being matched and assembled with a connector shell of the hollow-core optical fiber connector; the hollow-core optical fiber connector comprises a connector shell and an optical fiber beam expanding contact piece arranged in the connector shell. Efficient optical signal transmission can be achieved, and the requirements of an optical fiber communication system for efficient and stable connection performance are met.

The invention discloses an optical cable fault detection method, apparatus and device, and a medium. The method comprises the steps of collecting original data for model training; carrying out data preprocessing on the collected original data; constructing and training an optical cable fault detection model, wherein the optical cable fault detection model comprises a waveform anomaly detection module, a TOP-Net fault recognition network and a positioning module; the waveform anomaly detection module preliminarily screens out a fault point as a candidate fault point; the TOP-Net fault recognition network outputs a fault category judgment result according to the input candidate fault points; the positioning module determines a position index of a fault point by taking differential gradient abrupt change information in the fusion feature as a core; and detecting the optical cable fault by using the trained optical cable fault detection model. The optical cable fault is identified and positioned, the maintenance intelligence level of an optical fiber communication system is improved, the operation and maintenance cost is reduced, and stable operation of a communication network is guaranteed.

A virtual fiber communication system includes a central cloud server that obtains telemetry information from a plurality of network nodes in a backhaul network. The network nodes include hybrid analog-digital repeater devices. The server also obtains frequency-spectrum availability metadata and custom-defined spectrum-access parameters from spectrum-owner nodes. The server causes each hybrid analog-digital repeater to form dual analog data links on a first and a second polarization with at least one neighboring hybrid analog-digital repeater. Using the telemetry information, the frequency-spectrum availability metadata, and the custom-defined spectrum-access parameters, the server detects spectrum-availability variations across the network nodes, determines routing paths for a first type of UEs designated as premium users, generates control signals that assign data streams to rented or leased spectrum frequencies, and selects one of the routing paths to deliver the data streams to the premium UEs while satisfying the custom-defined spectrum-access parameters.

The invention discloses a mode division multiplexing optical fiber communication phase calibration method based on CNN-LSTM, and belongs to the technical field of optical fiber communication. By constructing a double-input CNN-LSTM hybrid neural network architecture, MIMO input signals and original target signals of mode division multiplexing optical fiber communication are obtained, data preprocessing is carried out, and the spatial feature extraction capability of a convolutional neural network and the time sequence modeling capability of a long-short-term memory network are combined, so that the MIMO input signals and the original target signals of mode division multiplexing optical fiber communication are obtained. Effective compensation of phase noise in long-distance strong-coupling mode division multiplexing optical fiber communication is realized, and a double-branch network comprising an image input layer, a convolutional layer, an LSTM layer, a deep connection layer and a user-defined phase calibration layer is constructed by separating complex MIMO signals into real and imaginary parts and generating a sliding window training sample. The problems that a traditional algorithm is limited in phase noise compensation capacity and poor in convergence performance under the strong coupling condition are effectively solved, and the balance performance and the transmission quality of a mode division multiplexing optical fiber communication system are remarkably improved.

The invention provides a vehicle-mounted optical fiber communication system and method and a vehicle. The vehicle-mounted optical fiber communication system comprises a main controller, a regional gateway, terminal equipment, a backbone network and an access network, the backbone network and the access network carry out signal transmission based on optical fibers; the backbone network comprises a control signal transmission channel and a data signal transmission channel; the main controller is used for sending an optical control signal to the regional gateway through the control signal transmission channel and sending a first optical data signal to the regional gateway through the data signal transmission channel; and the regional gateway is used for receiving the optical control signal and the first optical data signal, receiving a second optical data signal sent by the terminal equipment through the access network, and sending the second optical data signal to the main controller through the data signal transmission channel. Therefore, high-speed data communication between the slave master controller and the terminal equipment is realized, the data communication rate of the vehicle is improved, and actual use requirements can be met.