19 results about "Optical fiber communication systems" patented technology

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.

An optical fiber link testing method and apparatus, and an optical fiber communication system, belonging to the technical field of communications. An optical transmitting device transmits a first optical signal to an optical receiving device by means of an optical fiber link, the first optical signal carrying a test sequence, the test sequence comprising a plurality of sub-test sequences, and the plurality of sub-test sequences being carried in the first optical signal in a multiplexed manner. The optical receiving device receives a second optical signal by means of the optical fiber link, the second optical signal comprising the first optical signal and a reflected optical signal. The optical receiving device demodulates the second optical signal to obtain the test sequence. The optical receiving device determines transmission performance of the optical fiber link on the basis of the test sequence obtained from the demodulation. In the present application, the existing optical transmitting devices and optical receiving devices in optical fiber communication systems are used to test the transmission performance of optical fiber links, such that the optical fiber links can be tested without deploying additional devices in the optical fiber links, achieving simple hardware implementation for testing optical fiber links and lower test costs.

The application relates to a power grid special communication protocol transmission method, system and device based on FPGA. The method mainly comprises the following steps: packaging data to be transmitted into frame structure data; performing forward error correction coding on the frame structure data at a sending end to form extended frame structure data; transmitting the extended frame structure data to a receiving end through a communication link; performing forward error correction decoding on the received frame structure data at the receiving end to obtain decoded frame structure data; performing frame disassembling processing on the decoded frame structure data to extract valid data; and checking the valid data, and completing data receiving when the checking is passed. The application can solve the protocol jamming problem caused by asymmetric bandwidth, and improve the reliability and efficiency of data transmission of a power optical fiber communication system.

The application discloses an inter-cabin optical fiber communication system suitable for a high-voltage interlocking system, and the inter-cabin optical fiber communication system comprises a link cabin and a control cabin, the control cabin comprises a controller, the link cabin comprises a plurality of power units and a sub-control board, the sub-control board is connected with the controller through a high-speed optical fiber, and each power unit is connected with the sub-control board through a low-speed optical fiber. Through the application, the problem of inter-cabin communication of the high-voltage interlocking system is effectively solved, and the safe and stable operation of the high-voltage interlocking system is ensured.

The application provides a method and device for intra-channel and inter-channel nonlinear joint compensation of a WDM system based on an improved LDBP and electronic equipment, and belongs to the technical field of optical fiber communication. The method compensates dispersion by using a linear filter in the time domain, the corresponding network structure is designed as one-dimensional convolution, and the pulse broadening effect is combined in the overlap reservation method, the physical model of nonlinear compensation is improved by considering the interference of intra-channel dispersion pulse broadening and the walk-off effect between channels, and the purpose of intra-channel and inter-channel nonlinear joint compensation is achieved. The application fully utilizes the random interaction between inherent dispersion and nonlinearity in the optical fiber communication system to compensate the phase shift caused by the nonlinear effect, can effectively equalize the nonlinear distortion of the signal under the condition of controlling the calculation complexity and reducing the implementation cost, and is expected to play a better role in the long-distance transmission of the large-capacity WDM system.

The application discloses a CNN-LSTM-based phase calibration method for mode division multiplexing optical fiber communication 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 acquired, data preprocessing is carried out, the spatial feature extraction capability of a convolutional neural network and the time series modeling capability of a long short-term memory network are combined, effective compensation of phase noise in long-distance strong coupling mode division multiplexing optical fiber communication is realized, complex MIMO signals are separated into real and imaginary parts and sliding window training samples are generated, and a double-branch network containing an image input layer, a convolutional layer, an LSTM layer, a deep connection layer and a self-defined phase calibration layer is constructed. The problems that the phase noise compensation capability of a traditional algorithm is limited and the convergence performance is poor under a strong coupling condition are effectively solved, and the equalization performance and transmission quality of a mode division multiplexing optical fiber communication system are significantly improved.

This utility model discloses a rotating mechanism for driving optical fibers in a hollow-core optical fiber fusion splicer. The mechanism includes a rotating mechanism body, with an optical fiber rotation positioning mechanism mounted at the front. A rotating seat is mounted on the optical fiber rotation positioning mechanism, and a notch is formed on the surface of the rotating seat. An optical fiber is inserted through the notch. A conductive slip ring is mounted on the rotating mechanism body, and a driving ring is movably mounted inside the conductive slip ring. Connecting seats are fixedly mounted on both sides of the end of the driving ring, and the connecting seats are screwed to the end face of the rotating seat. This rotating mechanism allows the optical fiber to rotate during thermal fusion welding. By rotating the optical fiber, the optimal alignment angle can be found, reducing fusion loss caused by the irregularity of the optical fiber itself. This ensures that the two optical fibers can achieve ideal concentric alignment during fusion splicing, avoiding limitations on the transmission bandwidth and data transmission rate of the optical fiber communication system, which could lead to signal distortion and affect communication quality.

This invention proposes a b-modulation nonlinear frequency division multiplexing system based on Gaussian mixture clustering, belonging to the field of optical fiber communication system technology. It creatively applies the Gaussian mixture clustering algorithm to the b-modulation nonlinear frequency division multiplexing system, replacing the original hard decision and soft decision algorithms of the b-modulation nonlinear frequency division multiplexing system, to equalize the phase rotation of the received constellation diagram caused by noise, thereby eliminating the influence of spontaneous emission noise from the EDFA amplifier and various adverse factors in the optical fiber channel. At the same time, it performs clustering decision on the demodulated 16QAM constellation diagram data, reducing the bit error rate of the system and improving the system performance.

The present invention relates to a method for dual-polarized WDM transmission over optical fiber, which uses a specific I / Q coding to combat the effects of PDL. The modulation symbols transmitted in 2N polarization states on N wavelengths are decomposed (220) into real and imaginary values. A first orthogonal linear transform (230-1) is applied to the vector of real values ​​thus obtained, and a second orthogonal linear transform (230-2), different from the first, is applied to the vector of imaginary values ​​thus obtained. In JPEG2024530267000060.jpg7170 A complex scalar that solves the 8170 irreducible polynomial is multiplied with either the first or second transformation vector before the two transformation vectors are summed (240) to provide a vector of transmit symbols for modulating the different polarization states of the WDM channel.

This invention provides a clock leakage compensation method and system for optical fiber communication systems, comprising: Step S1: establishing a training dataset and constructing a learnable digital signal normalization structure; Step S2: training the learnable digital signal normalization structure using the training dataset; Step S3: using the trained learnable digital signal normalization structure to implement clock leakage compensation and deploying it in the optical fiber communication system. This invention constructs a learnable digital signal normalization structure, a training method, and a deployment process. The method and system can be used to compensate for clock leakage in optical communication systems and improve the transmission system performance of optical fiber communication systems.

The application belongs to the technical field of optical fiber rotary connectors, and discloses a super-multi-path optical fiber rotary connector, wherein optical fiber collimators are arranged on input end fixed end covers and output end fixed end covers in a same layer interval type concave-convex staggered form and / or an inner-outer layered form, on the basis of not changing a light aperture d of a dove prism, a fiber collimator adjusting hole d1 and a fiber collimator mounting hole d2, as many paths as possible are increased, the fiber collimator adjusting hole has no intersection, and interference can be avoided, the number of paths is increased through different fixed end cover designs, different arrangements correspond to different adjusting sequences, super-multi-path optical fiber rotary connector design is realized, and the problem of large data transmission in an optical fiber communication system is solved.

This invention relates to the field of optical communication technology, specifically to a phase noise-insensitive high-order cumulant modulation identification method. The key technical points include the following steps: S1, signal preprocessing; S2, calculating the phase noise-insensitive high-order cumulant of the signal, and constructing two feature parameters based on the phase noise-insensitive high-order cumulant; S3, constructing a modulation format classifier using a decision tree method; S4, inputting the feature values ​​from step S2 into the modulation format classifier constructed in step S3 to determine the modulation format of the signal under test. By addressing the issue that traditional high-order cumulant algorithms are affected by phase noise caused by laser linewidth in optical fiber communication systems, this invention improves the high-order cumulant algorithm, calculates the phase noise-insensitive high-order cumulant value of the signal, constructs two feature parameters based on the phase noise-insensitive high-order cumulant, and finally uses the feature parameters as classification features, inputting them into the decision tree modulation format classifier for classification.

The application provides a transmission line, which comprises a plurality of stators, an up-down connection mechanism, an optical fiber line and a drag chain; the stators are sequentially spliced; the up-down connection mechanism comprises an up-down connection driving assembly and an up-down connection stator arranged on the up-down connection driving assembly; the up-down connection driving assembly is used for driving the up-down connection stator to move so that the up-down connection stator is connected with at least one stator; the optical fiber line is connected in series along a transmission direction, and the stators and the up-down connection stator are connected in series; the optical fiber line comprises a movable section, which is connected between the up-down connection stator and the stator connected with the up-down connection stator; and the drag chain is wrapped around the movable section. Through the above structure, the drag chain is arranged to protect the optical fiber line in the movable section from physical damage caused by movement, thereby significantly reducing the risk of signal interruption or attenuation failure caused by the breakage or excessive bending of the optical fiber line, and improving the long-term operation stability and service life of the whole optical fiber communication system.

The application provides a kind of optical fiber communication system carrier phase recovery method and device.Method includes using linear time domain data filtering to carry out predicted receiving signal carrier phase noise in the receiving end of optical fiber communication system;According to the predicted carrier phase noise, the receiving signal is pre-rotated, and the carrier phase noise is pre-compensated;Residual error of the receiving signal after pre-rotation is estimated by power iteration method, for extracting the error between predicted carrier phase noise and actual phase noise;According to the error between the predicted phase noise and the actual phase noise extracted, the next state quantity of linear time domain data filtering is updated, and the carrier phase recovery is realized.The method can effectively solve the carrier phase recovery problem in optical fiber communication system, and has good algorithm robustness under low signal-to-noise ratio condition, and low computational complexity.

A virtual fiber communication system includes a central cloud server that obtains telemetry information from a plurality of network nodes of a wireless backhaul mesh network. The central cloud server obtains frequency spectrum availability metadata and custom-defined access parameters from spectrum owner nodes. The central cloud server detects one or more radio frequencies that are unused or underutilized in different geographical areas under coverage by the wireless backhaul mesh network. The central cloud server allocates the detected one or more radio frequencies that are unused or underutilized to one or more portions of the wireless backhaul mesh network based on a successful authorization from the one or more spectrum owner nodes and the custom-defined access parameters, where each of the one or more portions of the wireless backhaul mesh network includes a different subset of network nodes of the plurality of network nodes.

Systems, devices, and techniques for performing wavelength division multiplexing or demultiplexing using one or more metamaterials in an optical communications systems are described. An optical device may be configured to shift one or more phase profiles of an optical signal using one or more stages of metamaterials to multiplex or demultiplex wavelengths of optical signals. The optical device may be an example of a stacked design with two or more stages of metamaterials stacked on top of one another. The optical device may be an example of a folded design that reflects optical signals between different stages of metamaterials.

The application relates to a 100G line side signal FEC demodulation decoding method based on FPGA, aiming to improve the signal transmission reliability and transmission distance of a high-speed optical fiber communication system, and simultaneously reduce the system cost. The method comprises key steps of signal preprocessing, synchronization, extraction, windowing, FFT operation, anti-aliasing filtering, signal demodulation, FEC decoding, signal recovery and error correction processing and the like. Through accurate signal processing technology and efficient FEC algorithm, the application can significantly improve the anti-interference ability and transmission quality of signals while maintaining high data throughput. In addition, the method also optimizes the hardware resource configuration and algorithm implementation of the FPGA, thereby reducing the power consumption and cost of the system. The application is suitable for 100G and higher rate optical fiber communication systems, and has important practical application value for improving the stability, reliability and economy of a communication network.

The application discloses a detection method and device of an optical fiber link and an optical fiber communication system, and belongs to the technical field of communication. An optical sending device sends a first optical signal to an optical receiving device through an optical fiber link, the first optical signal carries a detection sequence, the detection sequence comprises a plurality of sub-detection sequences, and the plurality of sub-detection sequences are carried in the first optical signal in a multiplexing manner. The optical receiving device receives a second optical signal through the optical fiber link, the second optical signal comprises the first optical signal and a reflected optical signal. The optical receiving device demodulates the second optical signal to obtain the detection sequence. The optical receiving device determines the transmission performance of the optical fiber link according to the demodulated detection sequence. The application utilizes the existing optical sending device and the optical receiving device of the optical fiber communication system to detect the transmission performance of the optical fiber link, and the detection of the optical fiber link can be realized without deploying additional devices in the optical fiber link, the hardware implementation of the detection of the optical fiber link is simple, and the detection cost is low.

The application provides an EDFA optical fiber signal amplification system based on intelligent gain, which comprises an input signal processing module for extracting optical signal characteristics, a signal amplification module for generating output optical signals through multi-stage amplification, a signal monitoring module for monitoring input and output signals in multiple dimensions, an intelligent control module for executing a gain control algorithm based on monitoring data and signal characteristics to generate a pump control signal, and a pump control module for adjusting the working state of a pump source and feeding back to the amplification module to realize intelligent gain control. The application can realize precise gain adjustment and dynamic optimization of the EDFA optical fiber signal amplification system, improve the stability and performance of the system under complex working conditions, reduce energy consumption, and enhance the reliability and transmission efficiency of the optical fiber communication system.