380 results about "Optical link" patented technology

The invention relates to the technical field of network service testing, in particular to a testing method and system based on optical fiber characteristics. The method comprises the following steps: acquiring multi-dimensional optical fiber characteristic data of an optical fiber link through optical fiber characteristic acquisition equipment; performing characteristic data hierarchical integration on the multi-dimensional optical fiber characteristic data to obtain an optical link characteristic vector group; performing temperature-error code wavelet transform association according to the optical link feature vector group to obtain a temperature-error code wavelet feature set; constructing an association prediction matrix according to the temperature-error code wavelet feature set; performing a service delay exception test according to the association prediction matrix to obtain a delay tail exception event set; and performing micro-bend three-dimensional feature recognition according to the delayed tail abnormal event set to obtain micro-bend mode features. According to the invention, the operation and maintenance efficiency, reliability and toughness of the optical fiber network of the data center are improved through full-link test analysis from optical fiber physical characteristics to storage service delay.

The invention relates to the technical field of underwater communication and positioning, in particular to a multi-mode underwater wireless communication system based on dynamic link calibration, which integrates underwater acoustic positioning guide, attitude adaptive tracking control, optical link enhancement and an error code correction mechanism. Comprising a central control core, an acoustic communication unit, an optical communication transmitting unit, an optical signal receiving unit, an optical control unit, a multi-axis attitude adjusting unit, a data fusion and verification processing unit and a high-speed modulation-demodulation and error code correction unit. And by using a double-shaft servo motor and automatic gain control, real-time target tracking and accurate alignment of optical signals are realized, FPGA and OFDM modulation are combined to optimize data throughput, and a data cross validation mechanism is introduced to correct error codes, so that the data integrity is improved.

The invention discloses a communication method between graphics processors, a product, equipment and a medium, relates to the technical field of high-performance calculation and artificial intelligence acceleration, and is applied to a stand-alone system comprising a plurality of graphics processors and a central photoelectric hybrid switching chip constructed based on interconnection of an electric switching matrix and an optical switching matrix. The graphics processor is connected with the central photoelectric hybrid switching chip through an optical link and an electric link; the method comprises the following steps: performing data classification on to-be-transmitted data of a source graphics processor; if the to-be-transmitted data is a control flow, the source graphics processor is controlled to send the to-be-transmitted data to an electric switching matrix through an electric link, and then the to-be-transmitted data is routed to a target graphics processor in the graphics processors; and if the to-be-transmitted data is a data stream, the source graphics processor is controlled to send the to-be-transmitted data to the optical switching matrix through the optical link, and then the to-be-transmitted data is routed to the target graphics processor. Interconnection between graphics processors is optimized to improve communication efficiency between graphics processors.

The invention discloses a microwave laser hybrid link radio star calibration device and method suitable for deep space exploration, and relates to the field of spaceflight deep space exploration. Pointing calibration of a microwave and laser hybrid link of a deep-space large-aperture antenna is completed through radio star calibration, firstly, after pointing calibration and stable tracking of the microwave link are conducted on the microwave link, fine tracking is conducted on the laser link, pointing calibration of the laser link is completed, respective pointing error correction coefficients are formed, and real-time correction of antenna pointing is achieved. Microwave laser link hybrid radio star calibration is not limited by distance and geographical conditions, and real-time calibration can be realized; the beam of the laser link is narrower than that of the microwave link, the calibration precision is higher, and the system pointing precision and the photoelectric axis consistency precision can be improved. The method is simple in design, high in generalization, low in implementation difficulty and convenient to implement and popularize.

Coherent wavelength division multiplexing is provided using frequency comb sources for both the transmitter and the local oscillator (LO) in the receiver. The local oscillator is made phase coherent with the received multifrequency optical signal using two analog control loops. One of the control loops locks an optical frequency of the local oscillator to an optical frequency of the received frequency comb. The other control loop locks a microwave frequency of the local oscillator (i. e. LO the comb spacing) to the comb spacing of the received frequency comb. As a result, coherent detection is enabled in all channels with just two analog control loops. Control signals for the two loops can be derived from two of the received channels individually (asymmetric carrier recovery), or they can be derived from sum and difference signals from two of the received channels (symmetric carrier recovery).

The invention discloses an on-chip time-frequency transmission system and method based on an octave optical comb and an electro-optical modulation optical comb, and the method comprises the steps: constructing a chip-based optical reference cavity through the technologies of vacuum optical cement, photoresist backflow and the like, and achieving an on-chip ultra-stable laser through a phase modulator and a reflection separation optical path; an on-chip laser source pumping micro-ring resonant cavity is utilized to generate an octave optical frequency comb, frequency multiplication is carried out on the on-chip laser source pumping micro-ring resonant cavity and an additional laser source to realize detection and locking of carrier envelope offset frequency (fceo), frequency beating is carried out on the on-chip laser source pumping micro-ring resonant cavity and the on-chip ultra-stable laser device to realize frequency beating (fbeam) locking, and the laser source is utilized to generate an electro-optical modulation optical frequency comb through a circulating phase modulator to realize frequency beating and locking of the on-chip ultra-stable laser device. And the optical time frequency is locked with the locked octave optical comb, is sent to a far end after polarization control and light amplification, and simultaneously receives an electro-optical modulation optical comb at the far end and performs linear light sampling, so that the transmission of the optical time frequency is realized. The optical fiber or space optical link time-frequency transmission device can realize optical fiber or space optical link time-frequency transmission, and has the advantages of low overall noise, high transmission precision, compact structure, small size, low power consumption and the like.

The invention relates to an automatic test method of an FTTR optical link, which comprises the following steps: acquiring specified parameters of the FTTR optical link to be detected, establishing communication connection between a test control center and FTTR equipment, dynamically generating an optical link test instruction and sending the optical link test instruction to the FTTR equipment, and testing the optical link according to the received optical link test instruction. The test control center performs comparative analysis on the received test data and preset standard data, inputs the test data into a machine learning model for training and updating, judges whether the optical link has a fault based on a comparative analysis result and a prediction result, and marks a fault type and a fault position by using a fault positioning algorithm if the optical link has the fault; and generating a test report based on the comparative analysis result, the fault judgment result, the fault type and the fault position, and automatically generating a fault solution according to the fault type. According to the method, automatic and intelligent testing of the FTTR optical link is realized, and the fault diagnosis efficiency and accuracy are improved.

The present invention relates to the field of high-rate mobile wireless communications. Disclosed are a multi-frequency multi-polarized wide-beam scanning base station system, and an optimization design method. The method comprises: on the basis of an aperture field expansion theory and a mode coupling theory, designing a conical horn feed source antenna capable of radiating a Gaussian fundamental mode beam, and providing a stable beam width and a stable phase center; designing a beam separation device based on a periodic structure, wherein the beam separation device includes band-pass frequency selective surfaces and a linear polarization grid; and combining front-end quasi-optical links of multiple frequency channels and multiple polarized channels, so as to increase the bandwidth and communication rate of a base station antenna. In the present invention, a genetic optimization algorithm is combined with reflector shaping, thereby effectively reducing the conflict between a shielding effect of a dual-reflector antenna and a scanning angle, and realizing the multiplication of a beam scanning angle.

Consistent with the present disclosure, an encoder circuit is provided at a transmit side of an optical fiber link that maps an input sequence of bits of fixed length k a sequence of symbols of a codeword of length n, such that the symbols of the codeword define a predetermined transmission probability distribution. Preferably, each symbol of the codeword is generated during a corresponding clock cycle, such that after n clock cycles, a complete codeword corresponding to the input bit sequence is output. On a receive end of the link, a decoder is provided that outputs the k-bit sequence every n clock cycles. Accordingly, buffers need not be provided at the output of the encoder and the input of the decoder, such that processing of the input sequence, codewords, and output sequence may be achieved efficiently without large buffers and complicated circuitry. Moreover, the input sequence, with any binary alphabet may be matched to a desired output distribution with any arbitrary alphabet. Accordingly, probabilistic constellation shaping may be achieved over constellations of arbitrary size. In addition, relatively long codewords, may be encoded and decoded with the apparatus and method disclosed herein. Accordingly, for a fixed SNR a higher SE (more bits per symbol) can be achieved. Alternatively, for a fixed SE, a lower SNR may be sufficient. Moreover, the resulting SE may be finely tailored to a particular optical link SNR to provide data transmission rates that are higher than the low order modulation formats that would otherwise be employed for optical signals carried by such links.

The present disclosure provides an integrated circuit (IC) structure. The IC structure includes an optical interposer having optical waveguides; a plurality of chip stacks disposed over the optical interposer, each of the plurality of chip stacks including a first photonic IC chip and a memory chip over the first photonic IC chip; and a plurality of first laser source chips disposed adjacent to the plurality of chip stacks, respectively, wherein the optical waveguides in the optical interposer are configured as an optical interconnect structure to couple with the memory chip through the first photonic IC chip.

A radio system includes a feed network, an edge wavelength switching system (EWSS), a photodetector, and a broadband lens-based antenna subsystem. The feed network aggregates a plurality of unmodulated optical carriers and modulated optical carriers for delivery to an optical link. The EWSS receives the plurality of unmodulated optical carriers and modulated optical carriers from the optical link, and selects a first unmodulated carrier and a first modulated carrier as a first selected optical carrier pair. The photodetector receives the first selected carrier pair from the EWSS and generates a first electrical signal from an optical beat of the first unmodulated carrier with the first modulated carrier. The broadband lens-based antenna subsystem receives the first electrical signal from the photodetector, propagates the received first electrical signal through a lens body, and outputs a first directional wireless beam signal containing signal data from the first modulated carrier.

The invention relates to the technical field of distributed data synchronization, in particular to a three-terminal message synchronization method, which comprises the following steps of: generating FALCON public and private keys for three terminals respectively, negotiating a two-threshold threshold public key, writing a message key hash with a vector clock into a multi-branch Verkle tree, and updating a root abstract; a sending end carries out integrity proof broadcasting through a Bloom bitmap, a compression model, a root abstract and zero knowledge; a receiving end compares the bitmaps to obtain a difference set, and a coding window, a redundancy proportion and power distribution are obtained through reinforcement learning; a sending end uses sparse Fountain coding to send difference set packets in wireless and optical links in a shunting manner; a receiving end carries out linear solution decoding, verification and certification, batch box opening, supplementary signing aggregation and root abstract refreshing; and the completion rate and the link quality are continuously written, and self-adaptive operation is carried out in offline, alternating or low-power scenes. The method has the advantages of quantum security, low bandwidth, low time delay and energy conservation, and transaction omission and data conflict can be avoided.

The invention discloses a microwave laser composite antenna off-axis tracking method suitable for deep space exploration, and relates to the field of spaceflight deep space exploration. According to the method, Ka frequency band link angle tracking is completed firstly, and then a laser link is guided to be captured and tracked rapidly. Microwave link wave beam off-axis tracking is adopted, and simultaneous real-time target tracking of a microwave link and a laser link is achieved; the Ka beam is used for guiding the laser beam to rapidly capture and track, so that the laser beam coarse tracking robustness is improved, and the capture time is reduced; after the laser link finishes fine tracking, the system performs target tracking by using laser beam tracking, and compared with microwave Ka beam tracking, the tracking precision is higher; by using microwave link wave beam off-axis tracking, the problem that microwave link wave beams and laser link wave beams cannot be simultaneously aligned with a target due to inconsistent directions of a microwave electric axis and a laser optical axis is avoided. The scheme is simple and easy to realize, and can be directly applied to the existing integrated antenna.

A bi-directional optical communication system employing a minimum number of single-mode high repetition rate pulsed optical signal sources to achieve cost efficiency while maintaining high data rates. The bi-directional optical communication system includes a first optical data processing unit and a second optical data processing unit. The first optical data processing unit modulates a pulsed optical source using a differential quadrature phase shift keying (DQPSK) modulation and two-level pulse amplitude (PAM-2) modulation and then demodulates it to achieve a pulse amplitude modulated signal. The second optical data processing unit reuses the same optical carrier by passing it through a regenerative wavelength converter to generate three pulsed optical carriers at different wavelengths and employs an On-off keying (OOK) modulation scheme. These carriers are employed to send uplink data at a same rate of as the downlink. As a result, large data is transmitted from one data center to another data center through a downlink and uplink free space optical link network.

The invention discloses an acoustic optical communication positioning method for an autonomous adjustment channel of an underwater robot, and the method comprises the steps: constructing an underwater dynamic acousto-optic fusion repeater, achieving the wide-area guaranteed-bottom connection with the underwater robot through an acoustic link, and providing meter-scale precision coarse positioning covering a whole operation region; the method provides prior information for rapid establishment of a subsequent optical link, further dynamically compresses an optical search area to realize rapid and accurate link establishment, and performs autonomous and smooth switching among acoustic, optical and acousto-optic hybrid transmission modes according to real-time link quality assessment (signal-to-noise ratio), thereby realizing acousto-optic deep coupling and cooperative scheduling, and improving the reliability of the system. The system has the advantages of long-distance reliable connection, short-distance high-speed data return, high-precision positioning and the like, and solves the core technical problems that the distance and the speed cannot be obtained at the same time and the positioning precision and the coverage range are mutually restricted in the prior art.

A method for distributed allocation of data paths in an optical network (100) including optical switches (30, 32, 130) connected by optical links (44, 140), includes receiving a request for a data path for connecting a source node (10) and a destination node (20). In in response to the request, one or more queries are sent, the queries corresponding to one or more candidate optical circuits that connect the source node and the destination node, the queries requesting one or more processors (230) to configure the optical switches along the candidate optical circuits to reserve optical channels on the optical links of the candidate optical circuits for the requested data path. An optical circuit is identified from among the candidate optical circuits, in which all the optical channels for the requested data path have been reserved successfully. The requested data path is established over the identified optical circuit.

The invention discloses an automatic remote control method and system for a port machine, and relates to the technical field of automation, and the method comprises the steps: front-end processing equipment is connected with a lifting appliance positioning sensor and a motor driver, generates an equipment topological graph, is connected with a plurality of port machine PLC networks through a Profibus-DP coupler, and outputs a network state report; meanwhile, a dual-redundancy operation platform interface is configured and a state identification signal is output; based on the state identification signal, constructing an all-optical link and generating an optical fiber path topology, performing layered transmission on a lifting appliance control instruction and a path instruction, establishing a heartbeat detection mechanism and triggering a state confirmation signal; receiving a state confirmation signal and the wavelength allocation table, and acquiring laser radar point cloud data through a dedicated channel to execute lifting appliance obstacle avoidance correction; and based on the operation control authority and the new optimal path sequence, constructing a digital twin, and generating a scheduling report through an LSTM model. According to the method, the special channel and the shared channel are constructed, so that instruction blocking is eliminated.

Methods and systems for operation of an endpoint device of a deployment are disclosed. The endpoint device may obtain a network data united directed to a destination. The endpoint device may select a channel over which to forward the network data united based on a forwarding policy and a state of an optical link between the endpoint device and an optical service point. The forwarding policy may be keyed, at least in part, on the state of the optical link. The endpoint device may forward the network data unit over the selected channel to direct the network data unit towards the destination in order to facilitate provisioning of desired computer-implemented services.

The invention discloses a power distribution estimation method for optical performance monitoring of an optical communication system, and relates to the technical field of optical communication. A received signal is preprocessed to generate a complex value signal, the complex value signal is divided into two paths of signals, one path of signals is subjected to standard digital signal processing, the other path of signals is subjected to partial dispersion compensation, nonlinear compensation and residual dispersion compensation after dispersion reloading, absolute values of the two paths of signals are taken for related processing, and power is obtained; a power distribution diagram is obtained after repeated processing for n times, links of the power distribution diagram are changed, insertion losses are added to different link sections, then power is obtained by repeating the calculation method, multiple power distribution diagrams are obtained after repeated processing for n times, and all obtained power distribution diagram data are input into a deep neural network to train and recognize abnormal power distribution; according to the power distribution estimation method for optical performance monitoring of the optical communication system, the nonlinear Kerr effect of the optical fiber is utilized for longitudinal monitoring, and power distribution of multiple cross optical links is measured.

The invention discloses a test system and method for an optical engine module, an evaluation board, a storage medium and a product, and relates to the technical field of communication, and the system comprises the steps: carrying out the active test and passive test of a to-be-tested transmission link which is disposed between a switching assembly and a first connector and is adjustable in electrical interconnection parameter, covering an electrical-optical full link, and carrying out the passive test of the to-be-tested transmission link; active testing is carried out on a to-be-tested transmission link under current electrical interconnection parameters through the switching component to locate a performance critical value, passive performance parameters of a target to-be-tested transmission link under a critical state are measured through the testing component, a critical failure state is accurately associated with physical layer defects, design allowance is conveniently deduced in a reverse mode, and the performance of the to-be-tested transmission link is accurately determined. The interconnection design parameters of the optical engine module are determined based on the parameters, compatibility is improved, the problems of fuzzy performance boundary, unknown design margin and compatibility risk caused by lack of systematic testing in related technologies are solved, and the beneficial effect of providing quantifiable design basis for PCIe optical interconnection channels is achieved.

A system can include a unit cell of a ring modulator of a coarse wavelength division multiplexing (CWDM) optical link. The unit cell includes a ring resonator including a ring waveguide configured to receive, via a first bus waveguide, an optical signal, and modulate the optical signal to generate a modulated optical signal. The unit cell further includes a multiplexer, disposed between the first bus waveguide and a second bus waveguide, configured to filter the modulated optical signal.

Systems and methods for Doppler frequency shift compensation in free space optical links include a modulator configured to modulate a transmitter laser; a receiver including a Local Oscillator (LO) laser configured to receive a coherent signal; and circuitry configured to tune a frequency of the transmitter laser and the LO laser based on an amount of Doppler frequency shift to be compensated. The systems and methods determine an amount of Doppler shift between a first and second satellite and tune the frequency of the transmitter and LO laser based on the determined amount of Doppler frequency shift.

The invention particularly relates to a complete redundancy triggering device and method for an extra-ultrahigh voltage direct current transmission converter valve. The complete redundancy triggering device comprises a valve control device and a converter valve, the valve control device comprises a first triggering and monitoring case and a second triggering and monitoring case. The first triggering and monitoring case comprises a first main control board and a first triggering optical link; the second triggering and monitoring case comprises a second main control board and a second triggering optical link; the converter valve comprises a first optical splitter and a plurality of thyristor control units. The first main control board is connected with the first optical splitter through a first trigger optical link, the second main control board is connected with the first optical splitter through a second trigger optical link, and the first optical splitter is connected with the plurality of thyristor control units. According to the invention, when the optical link fault is triggered and detected back, fault processing of all board cards and channels can be carried out without power cut and converter valve locking, complete redundancy configuration of a valve control system is realized, and the operation reliability and stability of a direct current system are greatly improved.

A method for configuring an optical transmitter for transmitting optical signals over a passive optical link. The method includes using a digital processor to generate a target constellation probability distribution (CPD) for a probabilistic constellation encoder (PCE) of the optical transmitter. The target CPD is generated using a system performance optimization algorithm accounting for the transmitter peak power constraint and a peak enhancement property of a drive circuit of the optical transmitter.

The invention provides a graph data communication intensity mapping method and system based on optical transport network topology. According to the method, an adjacent matrix is established by extracting graph data structure information, vertex centrality and a clustering coefficient are calculated, and a graph data communication feature matrix is generated; oTN network equipment information and optical link topology are collected, link parameters and wavelength resource states are measured, and an OTN physical network feature matrix is obtained; establishing a double-layer mapping relation matrix through a resource mapping algorithm; integrating the communication frequency, the time delay sensitivity, the bandwidth requirement, the wavelength resource and the topological matching degree, and calculating a communication strength weight matrix; generating a candidate layout scheme, performing multi-dimensional evaluation, and determining an optimized data layout scheme; and dynamically adjusting the mapping relation by adopting an incremental updating algorithm. According to the invention, the efficient collaboration of the graph computing task and the optical transport network resource is realized, and the performance and resource utilization efficiency of the distributed graph computing system are obviously improved.

The invention provides an SDH / PDH payload real-time bandwidth analysis method based on time synchronization, and relates to the technical field of transmission networks, and the method comprises the steps: obtaining the network state information of each network working node in an optical transmission network; preprocessing the original data frame set to obtain an average effective load corresponding to each data frame in the data frame set, and calculating an effective load dynamic estimation value based on the average effective load and a historical average effective load; obtaining a network transmission resource allocation strategy of an optical link between any two adjacent network working nodes and a network transmission resource parameter corresponding to the network transmission resource allocation strategy according to a preset constraint condition and the effective load dynamic estimation value; and obtaining a comprehensive evaluation index of the current data frame according to the network transmission resource parameter and the load bandwidth performance function, and adjusting a flow distribution path of the optical transmission network according to the comprehensive evaluation index. According to the invention, the dynamic self-adaptive adjustment of the network flow can be realized.

The application discloses a kind of photonic tensor convolution calculation method and system for multi-channel data processing.The system includes multi-wavelength light source, high-speed modulator, signal generating unit, weighting unit, delay unit, balanced photodetector and signal processing unit, and the multi-channel tensor reconstruction algorithm of input signal.By improving the vectorization rule of tensor data, the elements of different channels in high-order tensor are rearranged into a one-dimensional vector.Based on the technology of three-dimensional multiplexing of time, space and frequency, only one modulator and a set of signal generating unit are needed to realize the convolution calculation of single optical link with arbitrary multi-channel tensor data simultaneously.The sliding convolution of multi-channel data can be directly completed in one calculation, which can release more physical hardware resources for multi-tensor parallel operation, complete more concise and efficient photonic tensor convolution operation, and greatly increase the integration and scalability of the scheme.

The embodiment of the invention provides an orbit-based laser link dynamic capturing, tracking and establishing ground verification device and method, and relates to the technical field of satellite communication, the device comprises a laser platform, a two-dimensional turntable, a turntable controller, a laser terminal and a terminal ground detector, and the laser terminal is mounted on the two-dimensional turntable; the laser platform comprises a collimator and a control computer; the collimator provides a far-field environment for inter-satellite laser link light beams; the control computer sends track data to the terminal ground detector and the turntable controller; the turntable controller calculates the target control quantity of the two-dimensional turntable by using the track data, and drives the two-dimensional turntable to rotate to a position corresponding to the target control quantity; the terminal ground detector broadcasts track data to the laser terminal; and the laser terminal calculates an inter-satellite pointing vector by using the orbit data, drives a light beam emitted by the laser terminal to point to an opposite end according to the inter-satellite pointing vector, and emits the light beam to the opposite end. According to the scheme, the inter-satellite capturing and tracking link establishment capability of the laser terminal and the laser link stability can be fully verified.

The invention provides an acousto-optic emergency communication device and equipment suitable for a weak communication scene, and the device and the equipment provide an acousto-optic communication full-modular hardware design, and have the characteristics of acousto-optic signal processing integrated design, acoustic communication, sensing and computing power separation design, high variability of a sensing module and the like. The hardware design of the invention effectively reduces the size required by the module and the computing power requirement on a single chip, and has the capabilities of rapid customization and multi-scene adaptation. The sound sensing module adopts a low-energy-consumption event driving sensing algorithm and an optical link quality prediction algorithm adaptive to the variable sensing module. The driving sensing algorithm is combined with a sensing signal through a sound signal sensing algorithm, flexible dormancy and rapid assessment of a sudden environment can be achieved, the method can be used in a low-computing-power platform, and energy consumption is effectively reduced. The prediction algorithm combines sound perception information and environment information, uses fuzzy logic to realize various input compatibility of various scenes, abstracts various environment information and sensor data, and has multi-scene applicability and high accuracy.

The invention discloses a satellite-ground laser communication short window gamma-gamma turbulence parameter prediction method, and belongs to the technical field of satellite-ground laser communication and atmospheric turbulence channel parameter prediction. According to the method, aiming at the problems of strong dependence on a long observation window, great deterioration of prediction precision under a short window scene and insufficient robustness under a low signal-to-noise ratio condition in a traditional method, a satellite-to-ground optical link short window observation model and a gamma-gamma channel statistical model are established, short window training data with time correlation are constructed, and a satellite-to-ground optical link short window prediction model is established. And designing a short-window gamma-gamma network, extracting time domain features through a convolution trunk, realizing parameter joint prediction under physical constraints in combination with a flicker index physical regularization auxiliary head, and outputting a gamma-gamma distribution parameter prediction value. According to the method, parameter prediction with relatively high precision and relatively good stability can be realized under the conditions of a short observation window and a low signal-to-noise ratio, and the method can be used for turbulent channel state characterization of a satellite-ground laser communication receiving end.