143 results about "Optical communication networks" patented technology

The invention relates to the technical field of optical communication, and discloses an optical fiber loss evaluation method and system. The method comprises the steps that an optical fiber sensor collects real-time optical signal data and generates a dispersion velocity data sequence; extracting a fluctuation feature vector by adopting an adaptive filtering algorithm, and determining a dispersion velocity change trend; inputting the change trend and the transmission distance into a neural network model, predicting a loss fluctuation amplitude and generating a prediction loss sequence; calculating a coupling effect correlation coefficient, judging abnormal coupling and outputting an evaluation result; adjusting signal compensation parameters according to an evaluation result, optimizing nonlinear influence and determining a compensated dispersion velocity value; calculating a signal attenuation factor according to the compensated dispersion velocity value and the transmission distance, and generating an optimized transmission scheme; and updating optical communication network parameters according to the scheme, outputting stable signal quality and generating an optical fiber loss evaluation result. According to the invention, the problem of inaccurate evaluation caused by nonlinear fluctuation and signal coupling is solved, and the stability of optical fiber transmission and the signal quality are improved.

The invention discloses an optical communication network operation and maintenance fault reporting, positioning and tracking system, which relates to the technical field of optical communication network operation and maintenance, and comprises a coarse positioning module for performing phase demodulation and interference signal matching on optical fiber echo data, identifying a sudden change point and an abnormal interval, and generating a potential fault interval and a coarse positioning coordinate; the fine positioning module is used for transmitting a coded pulse signal to a link where the optical fiber echo data is located according to the potential fault interval and the coarse positioning coordinate, and performing matched filtering and deconvolution processing to generate a fine positioning echo characteristic curve; the fault identification module is used for carrying out deep learning classification on the fine positioning echo characteristic curve, identifying a fault type and generating a diagnosis result; and the visualization module is used for mapping the diagnosis result to the topology and geographic position information of the link section where the optical fiber echo data are located, and generating a visual interface. According to the invention, the manual troubleshooting time is obviously reduced, and the fault processing efficiency and reliability are improved.

The invention discloses a pre-configuration protection method based on risk identification, and the method comprises the steps: collecting multi-dimensional data of a target electric power optical communication network, including logic topology information, a service demand set and dynamic environment data; logic links in the target power optical communication network are identified and divided into different shared risk groups, and a comprehensive risk index of each shared risk group is calculated; adding the shared risk groups of which the comprehensive risk indexes are greater than a preset risk index threshold value into a to-be-protected queue, and generating an optimal standby network loop for each shared risk group in the queue to obtain a network protection ring of the to-be-protected queue; when a to-be-processed service request is received, selecting a target protection path for the to-be-processed service request from the network protection ring, so that the to-be-processed service request is switched to the target protection path when a fault occurs; according to the invention, the network can be rapidly switched when a fault occurs, and the reliability and recovery speed of the power optical communication network are improved.

The embodiment of the application provides an optical amplifier, an optical assembly, an optical module, an optical communication network system and a detection device, relates to the technical field of semiconductors, and is used for solving the problem of one-way light emission of the optical amplifier. The optical amplifier comprises a waveguide and a photonic crystal. The waveguide comprises a core region and a cladding region arranged at the periphery of the core region. The waveguide further comprises an incident light side, a first light emission side and a second light emission side. The photonic crystal is arranged in the cladding region of the waveguide. The core region is located between the incident light side and the first light emission side, and the photonic crystal is located between the second light emission side and the core region. The photonic crystal is used for receiving incident light from the incident light side and emitting first emitted light and second emitted light. The first emitted light is emitted from the first light emission side, and the second emitted light is emitted from the second light emission side.

The invention discloses an optical burst link conflict control method and system based on priority scheduling, and relates to the technical field of optical communication network control, a burst joint scheduling and conflict cost evaluation mechanism based on priority weight is introduced into an OBS core node, and the method comprises the following steps: sorting control packets in a sliding time window, predicting an occupied time interval in combination with the offset time and the burst length; constructing a candidate gap set by using a lightweight data structure for recording each wavelength free interval; and calculating the conflict cost of each candidate wavelength according to the priority weight, the time overlapping relationship and the gap change after insertion, selecting the wavelength with the minimum cost, and updating the idle interval information in real time. Therefore, priority guarantee of high-priority services and refined allocation of wavelength resources are realized, so that burst conflicts and the discard rate are reduced in a high-load scene, and the throughput and the stability of an OBS network are improved.

The invention provides an optical network transmission quality prediction method based on multi-scale decomposition heterogeneous fusion, and relates to the technical field of optical communication network intelligent monitoring, and the method comprises the steps: taking an STL seasonal component, a first group of intrinsic mode functions and a second group of intrinsic mode functions of original QoT time series data as homologous input data, inputting the homologous input data into a heterogeneous fusion prediction model, and carrying out the prediction of the transmission quality of an optical network; after a TCN branch and an Informer branch extract a local feature tensor and a global feature tensor in parallel, tensor splicing is executed through a feature splicing layer, a fusion feature tensor is output, and a full-connection regression layer executes weighted mapping processing on the fusion feature tensor and outputs a transmission quality predicted value. The technical problems that an existing QoT prediction method is high in calculation complexity and difficult in long-range dependence modeling are solved. Local details and global semantic features are fused through a parallel structure, and feature distillation and residual connection optimization are combined, so that the accuracy and calculation efficiency of QoT prediction are remarkably improved.

A clock circuit, a receiver, and a passive optical communication network system are disclosed. The clock circuit is applied to a receiver in a passive optical communication network and is configured to adjust the clock frequency of an output clock signal based on a transmission protocol, the clock circuit comprises at least one clock path and a frequency divider, and the at least one clock path comprises a first clock path; wherein the first clock path receives a reference clock signal from the first phase-locked loop circuit and a control signal from the clock data recovery circuit, and interpolates a conversion signal of the reference clock signal by using the reference clock signal so as to output a multi-phase clock signal; and the frequency divider receives the multi-phase clock signal and performs frequency division on the multi-phase clock signal based on a preset frequency division value, and the preset frequency division value is determined based on a transmission protocol. The clock circuit can be compatible with fast clock switching schemes of data rates of different PON protocols, so that the adaptability and the locking performance of a receiver in a burst mode are improved.

The invention discloses an underwater optical communication routing method based on a three-dimensional dynamic conical sector, belongs to the technical field of underwater wireless communication, and is used for solving the problems of poor routing stability, low communication success rate, high energy consumption, non-adaptive path and the like in the existing underwater optical communication network. The method comprises the following steps: constructing an underwater optical communication network model in a three-dimensional space, and defining a dynamic cone communication sector based on a divergence angle and a direction angle between nodes; discovering neighbor nodes through a conical scanning mechanism, and performing multi-index optimization on candidate forwarding nodes based on distance progress, expected progress, energy efficiency indexes and time delay indexes; selecting an optimal path according to an evaluation result; performing competition coordination among candidate nodes by using a fast time slot response mechanism, and selecting a next hop node; and completing path construction through hop-by-hop transmission, dynamically adjusting a divergence angle, and executing path maintenance and updating. The method does not need global topological information, and is suitable for an underwater communication scene with uncertain node distribution in a dynamic environment.

The invention relates to a dynamic reconstruction method and system for a digital twin optical switching network, and relates to the technical field of optical communication network intellectualization, in particular to a dynamic reconstruction system applied to an optical switching network, comprising the following steps: in a digital twin, establishing a topological graph capable of being dynamically updated in real time by adopting multi-dimensional real-time topology perception, and combining key parameter data to obtain a topological graph; and high-precision twinning synchronization is established for the digital twinning body and the physical network state. And service intention analysis is performed on service requests or fault triggering reconstruction through an intention driving control layer, different services are constrained and mapped, and a constraint set is quantified. And combining the constraint set with source and destination nodes, and analyzing on a topological graph to generate a candidate strategy. And performing simulation verification by the digital twin through a simulation engine and pre-verification, selecting an optimal strategy, and outputting an instruction. In a physical network layer, physical processing such as port switching and light emitting of an optical module is executed according to an instruction, and performance deviation is corrected through closed-loop feedback. According to the invention, high-reliability and high-efficiency dynamic optical path reconstruction is realized.

The invention discloses an optical communication network operation and maintenance fault intelligent positioning and tracking method and system, and relates to the technical field of optical communication operation and maintenance decision making, and the method comprises the steps: collecting optical cable stress field data and environment image data in real time, and recognizing a cable trench marker through a pre-trained convolutional neural network; abnormal events are detected, and an abnormal event coordinate set and an image recognition abnormal sequence are generated; constructing an image-stress fusion positioning model, inputting the optical cable stress field data and the abnormal event coordinate set into the image-stress fusion positioning model, and generating accurate positioning coordinates; performing space-time sequence analysis on the optical cable stress field data, identifying an abnormal sequence in combination with an image, and generating a stress propagation rate and direction; generating a dynamic topological graph according to the accurate positioning coordinates; and coloring and grading the dynamic topological graph to form a risk conduction graph. According to the invention, by constructing the image-stress fusion positioning model, time-space unification and feature optimization of data are realized, and the precision and robustness of fault positioning are improved.

The invention relates to an intelligent calculation center optical network optical path survivability-oriented air-ground cooperative unmanned aerial vehicle distributed optimization deployment method and system, and belongs to the technical field of optical communication network protection. The invention aims to solve the technical problems of long switching time delay, limited coverage and poor stability of a traditional single ground or air protection mechanism. According to the technical scheme, an air-ground cooperative protection architecture is constructed, and firstly, an integer linear programming model with the aim of minimizing the total cost of a system is established to carry out precise deployment optimization of unmanned aerial vehicle nodes; in order to improve the solving efficiency, a spectral clustering and K-means clustering-based heuristic algorithm is designed to realize rapid intelligent division of the unmanned aerial vehicle service domain; the deployed unmanned aerial vehicle cluster adopts a master-slave architecture and has a failover mechanism, and a temporary relay network can be quickly established when a ground optical path fails. According to the invention, the survivability and fault recovery efficiency of the optical network are effectively improved, and good balance between deployment cost and protection performance is realized.

The invention provides an optical communication network, relates to the field of optical communication, and can reduce time consumption for replacing false light and signal light in a link. The optical communication network comprises at least three WSSs, and each WSS comprises a common end and a plurality of branch ends. The first branch end of the first WSS is connected with the first branch end of the second WSS; the second branch end of the first WSS is connected with the first branch end of the third WSS; the common end of the first WSS is used for receiving a first optical signal and outputting the first optical signal to the second WSS; the first WSS is also used for receiving a first control instruction issued by the network control device and outputting the first optical signal to the third WSS based on the first control instruction; the third WSS is used for receiving a second control instruction issued by the network control device before the first WSS outputs the first optical signal to the third WSS; and the third WSS is also used for outputting the first optical signal to the common end of the third WSS in response to the second control instruction after receiving the first optical signal. The embodiment of the invention is applied to optical communication.

The invention provides an optical cross node device with low cost and a high-reliability protection mode, which can improve the security and stability of an optical communication network. The node comprises a first switching unit array and a second switching unit array, each first switching unit comprises M1 input ports and N1 output ports, and each second switching unit comprises M2 input ports and N2 output ports. One part of the N1 output ports is connected with the first downstream node through a first working optical fiber, and the other part of the N1 output ports is connected with one input port of each second switching unit through a first internal optical fiber. The N2 output ports are connected with the second downstream node through the first protection optical fiber. The first switching unit is used for transmitting one path of optical signals to a first downstream node through a first working optical fiber, or transmitting one path of optical signals to the second switching unit through a first internal optical fiber. And the second switching unit is used for transmitting one path of optical signal to a second downstream node through the first protection optical fiber.

The application discloses a registration method and device of an optical communication network, and relates to the technical field of optical communication. A discovery window opened by an OLT is determined according to the distance between an optical relay device and a next-level optical network device of the optical relay device, and the OLT has configured specified BWmap information for the optical relay device, so that the OLT does not need to open a larger discovery window during the registration process of the next-level optical network device of the optical relay device, and only needs to open a discovery window suitable for the next-level optical network device. Therefore, the OLT only needs to open a smaller discovery window during the discovery process of an SN serial number, the time slot corresponding to the smaller discovery window is reduced, the service interruption time of other optical network devices in communication with the OLT is shortened, the uplink delay jitter of the optical communication network is reduced, and the communication stability of the optical communication network is improved.

Provided is an optical communication network, which relates to the field of optical communications, and can reduce the time taken for replacing dummy light with signal light in a link. The optical communication network comprises at least three WSSs, wherein the WSSs each comprise a common port and a plurality of branch ports; a first branch port of a first WSS is connected to a first branch port of a second WSS; a second branch port of the first WSS is connected to a first branch port of a third WSS; a common port of the first WSS is used for receiving a first optical signal and outputting the first optical signal to the second WSS; the first WSS is further used for receiving a first control instruction issued by a network control apparatus and outputting, on the basis of the first control instruction, the first optical signal to the third WSS; the third WSS is used for receiving, before the first WSS outputs the first optical signal to the third WSS, a second control instruction issued by the network control apparatus; and the third WSS is further used for outputting, after the first optical signal is received, the first optical signal to a common port of the third WSS in response to the second control instruction. The embodiments of the present application are applied to optical communications.

An optical communication node comprises an optical source for providing an optical signal and a quantum key exchange (QKD) facility configured to exchange a common qubit sequence with a communication partner based on the optical signal, as well as an optical transceiver configured to provide optical communication based on the optical signal.

The present application relates to the technical field of optical communication transmission, and discloses a path planning method based on an optical communication network, comprising the following steps: step one: connecting the optical communication network and an optical spectrum analyzer through a network, acquiring management data of a topology structure and signal monitoring data of all links, and classifying and forming a structure data set and a transmission data set, and real-time sensing a network state; step two: real-time analyzing link transmission bottlenecks of different topology structures, generating corresponding link bottleneck indexes, and efficiently positioning the link bottlenecks; step three: real-time analyzing the aggregable space of spectrum resources of the optical communication network, generating corresponding elasticity indexes, and directly reflecting the continuity and size of the available space of the spectrum resources; step four: setting bottleneck threshold values and elasticity threshold values with fixed numerical values, combining the link bottleneck indexes and the elasticity indexes, distinguishing transient shocks and persistent overloads, outputting corresponding path planning methods, and intelligently integrating high link utilization.

The invention relates to the technical field of optical communication transmission, and discloses an optical communication network-based path planning method, which comprises the following steps of: 1, connecting an optical communication network and an optical spectrum analyzer through a network, acquiring management data of a topological structure and signal monitoring data of all links, and classifying to form a structure data set and a transmission data set, sensing the network state in real time; 2, link transmission bottlenecks of different topological structures are analyzed in real time, corresponding link bottleneck indexes are generated, and the link bottlenecks are efficiently positioned; 3, analyzing an aggregable space of the spectrum resources of the optical communication network in real time, generating a corresponding elasticity index, and directly reflecting the continuity and size of the available space of the spectrum resources; 4, a bottleneck threshold value and an elastic threshold value with fixed numerical values are set, transient impact and continuous overload are distinguished in combination with a link bottleneck index and an elastic index, a corresponding path planning method is output, and the intelligent integration link utilization rate is high.

The embodiment of the application provides an optical assembly, a communication device and an optical communication network, and relates to the field of optical communication. The performance of the optical assembly is optimized. The specific scheme comprises: the optical assembly comprises a laser and a first optical waveguide. The laser is used for outputting a multimode signal light. The first optical waveguide comprises a first end and a second end arranged oppositely; the first end is used for receiving the first multimode signal light, and the second end is used for outputting a light beam from the first end. Wherein, the diameter of the core layer of the first end is 10-45 mu m, and the numerical aperture of the first end is 0.1-0.25. The rate of the multimode signal light is greater than or equal to 50 Gbps. The core layer of the first end can intercept the light rays of the high-order modes in the reflected light which are opposite to the transmission direction of the multimode signal light, reduce the noise of the laser, optimize the reliability of the laser and the optical assembly, and improve the problem of optical link flash.

The invention discloses a flow mode analysis method and system for PON topology anomaly recognition, and relates to the technical field of optical communication network management, and the method comprises the steps: collecting the flow, optical power, frame error rate and other operation and maintenance indexes of each optical network unit, constructing a flow distribution vector based on the data, and carrying out the time sequence feature modeling in combination with a historical normal state; performing mode learning and anomaly detection on traffic behaviors by using an auto-encoder model and calculating a reconstruction error and information theory divergence; the change of the topological structure is further quantified by adopting traffic correlation matrix difference analysis, three abnormal indexes are integrated to form a comprehensive abnormal index, and PON topology abnormity can be judged once the comprehensive abnormal index exceeds a set threshold value. Therefore, real-time monitoring and intelligent identification of PON network faults can be realized through multi-dimensional operation and maintenance index fusion and a time sequence convolution auto-encoder model without additional physical equipment.

The application relates to the technical field of intelligent scheduling of optical communication network resources, and discloses an intelligent scheduling method and system for optical communication network resources, which can comprehensively master the network operation state by acquiring equipment operation data, scheduling decision data and service performance data and performing time synchronization. On this basis, the method can identify weak fluctuations below a preset alarm threshold and perform risk marking, effectively solving the problem that weak fluctuations are difficult to be found in the prior art.

The utility model relates to optical communication network equipment technical field more specifically, relate to a kind of single-pumped bipolar erbium-doped fiber amplifier.A kind of single-pumped bipolar erbium-doped fiber amplifier, comprising: signal light source, optical isolator, coupler, pump laser, first-stage erbium-doped fiber and second-stage erbium-doped fiber;The output end of signal light source is connected with the first input end of coupler, and the output end of pump laser is connected with the second input end of coupler;The coupler, first-stage erbium-doped fiber, optical isolator and second-stage erbium-doped fiber are sequentially connected.

Methods, apparatus, and systems for coded modulation towards data transmissions across optical communication networks are provided. At a network transmitter, sequences of data bits encoded by forward error correction are partitioned and then selectively buffered. Each part of a sequence is mapped to a respective transmission symbol, such that the transmission symbols together represent the whole sequence. Upon receipt of the transmission symbols at a network receiver, two-stage decoding that involves counteractive buffering is used to decode the transmitted symbols. In some embodiments, symbol mapping involves geometric shaping of constellation points by a neural network to maximize generalized mutual information.

Various example embodiments for supporting burst mode communications in an optical communication system may be configured to support burst mode communications based on use of a burst delineation scheme for burst detection. The burst delineation scheme may be based on detection of a delimiter in a burst mode transmission based on selecting, from a received bit stream, a first and second sets of bits, computing first and second error statistics on the first and second sets of bits, computing one or more error metrics based on one or more linear combinations of the first and second error statistics, and determining, based on one or more comparisons based on the one or more error metrics and one or more error thresholds, whether the received bit stream includes a delimiter. The burst delineation scheme for burst detection may be used for burst detection within various types of optical communication networks, including passive optical networks.

This application provides a communication node and an optical communication network, belonging to the field of optical communication technology. The communication node includes a light source module, a link splitting module, and an optical transceiver module. The light source module provides local oscillator light and signal light to the optical transceiver module; the link splitting module receives downlink signals from the optical fiber, splits the downlink signals into N sub-downlink signals, and sends one sub-downlink signal to the optical transceiver module and the next node respectively, where N is a positive integer greater than 1; the optical transceiver module, based on the local oscillator light, obtains a signal with a wavelength matching the local oscillator light from the received downlink signals; it also generates an uplink signal with a wavelength different from the downlink signal based on the signal light, and sends the uplink signal to the optical fiber through the link splitting module. The uplink signal and the received downlink signal are transmitted in the same optical fiber but in opposite directions, saving optical fiber costs and fiber sourcing costs.

Embodiments of the present application provide a path planning method, a path planning device and an optical communication network, which are used to realize non-susceptible switching of high-quality primary and backup paths. The path planning method provided by the embodiments of the present application comprises: receiving request information and network resource information, the request information comprising information of a source node and a sink node, the request information indicating planning of primary and backup paths from the source node to the sink node, and the network resource information indicating topological information of a network. A first primary and backup path is sent, the first primary and backup path comprising a first primary path and a first backup path connecting the source node and the sink node in the network, the first primary path and the first backup path conforming to a mathematical model containing a delay difference constraint of the primary and backup paths, the mathematical model further containing an optimization strategy of the primary and backup paths, and a delay difference between the first primary path and the first backup path being less than or equal to a first threshold value.

The present invention concerns a system for generating quantum keys between two nodes of an optical communication network. The system comprises a transmitting node and a receiving node, operationally connected to each other by at least one birefringent optical communication channel. The transmitting node comprises a photon source, an optical port adapted to transmit and receive photons on the optical communication channel, a detector assembly adapted to detect and count photons received from the receiving node. The receiving node comprises an optical port for receiving and transmitting photons on the optical communication channel, and a photon emitter adapted to emit at least one photon in response to the at least one photon transmitted by the transmitting node. The photon emitter comprises at least one birefringent element. Advantageously, the receiving node comprises control means of the photon emitter. The control means are adapted to adjust a birefringence of the at least one birefringent element as a function of polarization information associated with the at least one photon transmitted by the transmitting node. In particular, the polarization information is extracted from the at least one photon transmitted by the transmitting node or is provided by the transmitting node. Advantageously, the photon emitter comprises an emulator device of a Faraday rotator mirror or comprises a retroreflector consisting of three mirrors orthogonal to each other and rotated by 45° around respective orthogonal axes. The Faraday rotator mirror and the retroreflector are orientable in space to reflect the at least one photon transmitted by the transmitting node uniquely and determined when oriented appropriately.

A registration method for an optical communication network, an apparatus, a network device, and a system are disclosed, and the disclosure relates to the field of optical communication technologies. Regardless of whether a sub ONU goes online for the first time or goes online again, a main ONU allocates a registration identifier (ONU ID) to the sub ONU based on prestored SNs of sub ONUs that are to go online. To be specific, the main ONU does not need to open an SN discovery window for the ONU that is to go online, and does not need to interrupt a service of another sub ONU that communicates with the main ONU, implementing registration of the sub ONU with the optical communication network without opening a quiet window, and reducing delay jitter of the optical communication network caused by a registration process of the sub ONU.