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.

The application discloses a signal rate splitting transmission method and receiving method suitable for optical fiber communication, and belongs to the technical field of communication. The transmission method comprises the following steps: decomposing the information of each user into public information and private information, combining the public information of all users into a public data stream, taking the private information of each user as a private data stream, and then performing serial-parallel conversion and constellation mapping to obtain a public information constellation point and a private information constellation point of each user; loading the public information constellation point onto a first group of subcarriers, loading the private information constellation point of each user onto a second group of subcarriers whose order is disturbed by a chaotic key, assigning the public information constellation point a first power, assigning the private information constellation point a second power smaller than the first power, and superimposing to form an RSMA signal. The application solves the problem that the existing optical fiber communication system cannot utilize multiple antennas to perform layered secure transmission.

An optical fiber communication while drilling system and an operation method. The system comprises: a slip ring (5) configured to convert an internal optical fiber channel from dynamic rotation to static transmission, wherein the slip ring (5) at least comprises a stator (5-2) and a rotor (5-3), the rotor (5-3) is configured to be communicated with an optical fiber link and is used for rotating together with a drilling tool during drilling, and the stator (5-2) is configured to receive an optical signal from the rotor (5-3) and output the optical signal for analysis and processing; and an optical fiber cable spool (10) connected to the rotor (5-3) of the slip ring (5) by means of a connecting rod (7) and at least comprising an optical fiber cable storage portion (10-2) and an anchoring mechanism (10-3), wherein the optical fiber cable storage portion (10-2) is used for storing an optical fiber cable, the optical fiber cable storage portion (10-2) is configured to release and retrieve the optical fiber cable downward into and from a wellbore within the drilling tool, and the anchoring mechanism (10-3) is configured to anchor the optical fiber cable spool (10) on the inner wall of the drilling tool when the drilling tool drills, and to disengage from the inner wall of the drilling tool when the drilling tool stops drilling.

The application belongs to the technical field of optical fiber communication, and particularly relates to a low-complexity real-time nonlinear compensation method for a short-distance optical fiber link system. The application adopts Volterra algorithm to realize nonlinear damage compensation. The algorithm is regarded as an adaptive updating tap filter, and is divided into a linear term finite impulse response filter calculation module, a nonlinear term finite impulse response filter calculation module, an error calculation module and a tap coefficient updating module. Further, the low-complexity processing of the nonlinear compensation is realized through pruning and non-uniform quantization. The application solves the nonlinear distortion problem caused by devices and transmission in the intensity modulation direct detection system, and is simpler to realize and has greatly reduced complexity, thereby saving power consumption more. The application has been verified on an FPGA development board, and provides a basis for the hardware implementation of the nonlinear compensation and lays a foundation for the further development of future optical fiber communication systems.

The invention discloses a nonlinear equalization method and device for digital subcarrier multiplexing signals and an optical fiber communication system. The method comprises the following steps: caching an original symbol of a transmitting end, and preprocessing a received signal to obtain a signal to be equalized; constructing a power model according to the link parameters and deducing a back propagation power model; inputting the data into an improved digital back transmission algorithm, and calculating a nonlinear accumulation amount in each equalization step length; determining an initial splitting ratio parameter by using a nonlinear symmetry principle, and embedding the initial splitting ratio parameter into the neural network as a trainable variable; inputting a received signal and an original symbol into a network, and optimizing a splitting ratio through gradient descent to obtain an optimal value; therefore, the position of a nonlinear operator in the improved digital back transmission algorithm is adjusted, linear and nonlinear combined compensation of the signal is realized, and a high-precision equalization result is output. According to the method, extra communication overhead is not needed, and the link power non-uniformity characteristic can be effectively adapted.

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 invention provides a cooperative communication and sensing optical transmission system based on an elliptical core few-mode optical fiber. The system comprises a transmitting end, the elliptical core few-mode optical fiber and a receiving end. The transmitting end converts a digital signal into a mode encoding sequence through a mode encoder and couples the mode encoding sequence into the elliptical core few-mode optical fiber; the elliptical core few-mode optical fiber effectively reduces crosstalk between modes by utilizing a relatively large effective refractive index difference between different mode groups of the elliptical core few-mode optical fiber, and effectively improves the security of information transmission by utilizing a mode coding mode; the receiving end detects the position of the end face of the output optical fiber through an imaging system and a camera, compensates the position of the end face of the optical fiber through an electric displacement table to improve the mode demodulation performance of the receiving end, and recovers a mode coding sequence into original digital information through a mode decoder and a signal processor. According to the invention, the security of the optical fiber communication system can be effectively improved, crosstalk between modes is reduced, the robustness of mode demodulation of the receiving end is increased, and the performance of the space division multiplexing optical fiber communication system is effectively improved.

An optical fiber link testing method and apparatus, and an optical fiber communication system, relating to the technical field of communications. An optical transmitting device generates a first optical signal carrying a test sequence, and sends the first optical signal by means of an optical fiber link. The first optical signal is transformed into a second optical signal after being transmitted by means of the optical fiber link, the second optical signal comprising the first optical signal and a reflected optical signal. An optical receiving device receives the second optical signal by means of the optical fiber link, the optical receiving device demodulates the second optical signal to obtain the test sequence, and the optical receiving device determines the transmission performance of the optical fiber link on the basis of the demodulated test sequence. In the present application, the transmission performance of an optical fiber link is tested by using the existing optical transmitting device and optical receiving device in an optical fiber communication system, and the optical fiber link can be tested without deploying an additional device in the optical fiber link, so that the hardware implementation for testing an optical fiber link is simple, and the test costs are relatively low.

The invention provides a four-wave mixing suppression method and system for an IMDD optical fiber communication system, and the method comprises the steps: introducing two orthogonal bias terms which are gradually changed along with time into a judgment-guided equalizer, and tracking in-phase and orthogonal channel components of noise after orthogonal down-conversion, therefore, the narrow-band noise of the specified frequency band can be efficiently eliminated from the received signal; by monitoring the phase rotation direction and speed of a complex signal formed by the two offset terms, the frequency difference of the actual noise center frequency relative to the reference frequency can be directly calculated, so that the low-complexity adaptive tracking of the noise center frequency drift is realized. According to the invention, any center frequency narrow-band noise in a signal band can be efficiently suppressed and the center frequency change can be adapted without interrupting the service without a complicated spectrum analysis module, so that the signal quality is remarkably improved.

The present disclosure relates at least to optical frequency hopping for channel presence detection in an optical network. An optical channel monitor (OCM) for optical channel attenuation detection in a fiber optic communication system and a method of using the OCM are disclosed, comprising: (a) heterodyne sampling of an optical signal from an optical fiber with light from a light source, the frequency of the light from the light source varying at a constant slope over time; (b) suspending the sampling in step (a); (c) after step (b), heterodyne sampling of the optical signal with light from the light source by frequency hopping; (d) concurrently with step (c), sampling, by the controller, the response of the optical signal to each frequency jump in step (c); and (e) in response to determining, by the controller, that at least one sample in step (d) exceeds a predetermined tolerance or range of the sample, the controller generates an error signal.

The invention relates to a technique for allocating time resources in a fibre-optic communication system comprising an optical line terminal connected to a plurality of user modules via a single optical fibre, the optical line terminal implementing a schedule for allocating time resources to the user modules updated periodically, allocating to a user module a time slot for the transmission of at least one frame from the user module. Such a technique is based on the implementation of the following steps: updating (100) the duration of the header fields, establishing (200) the allocation schedule taking into account the update of the duration of the header fields, and broadcasting (300) the established allocation schedule to all the user modules.

The application discloses a flange connector based on FC optical fiber and relates to the technical field of optical fiber connectors, which comprises the following components: a docking assembly, which comprises a docking base and a ferrule sleeve, the docking base is provided with a ferrule hole for inserting an optical fiber, and the ferrule sleeve is arranged on both sides of the port of the corresponding ferrule hole of the docking base; and a circuit assembly, which comprises a series-connected indicator lamp and an elastic contact, and the elastic contact is provided with a movable end which can be combined with the docking base. When the FC optical fiber connector is docked with the flange connector, the end of the FC optical fiber connector will extrude the elastic contact, the elastic contact will be in contact with the docking base, the circuit will be in communication, and the indicator lamp will be on. According to the on-off state of the indicator lamp, a worker can determine whether the FC optical fiber is well docked, and according to the brightness or flickering phenomenon of the indicator lamp, the worker can determine the access quality of the FC optical fiber, so that the worker can find the hidden trouble of the key link in the optical fiber communication system in time.

The invention discloses a spectrum analyzer for an optical fiber communication system, and relates to the technical field of spectrum testing. The device comprises a first collimating mirror, a spatial light modulator, first to fourth reflecting mirrors, a first focusing mirror, a slit, a second collimating mirror, a wave plate, a second focusing mirror and a detector, a spectral line sequentially passes through the first collimating mirror, the first reflecting mirror, the spatial light modulator, the second reflecting mirror, the first focusing mirror, the third reflecting mirror, the slit, the fourth reflecting mirror, the second collimating mirror, the wave plate, the second reflecting mirror, the spatial light modulator, the first reflecting mirror, the second focusing mirror and the detector to form a test light path; a spectral line sequentially passes through the first reflecting mirror, the spatial light modulator and the second reflecting mirror to achieve primary dispersion, the spectral line sequentially passes through the second reflecting mirror, the spatial light modulator and the first reflecting mirror to achieve secondary dispersion, and the spectrum analyzer can obtain higher spectral resolution through the secondary dispersion. And the detection efficiency is improved through the spatial light modulator.

The invention discloses a signal compensation method of an optical fiber communication system, which relates to the technical field of optical fiber communication and comprises the following steps: acquiring a baseband signal output after carrier phase recovery in a receiving end; a triple in the baseband signal is extracted, the triple is input into a target CLDNN network to obtain optical fiber nonlinear damage, the target CLDNN network is obtained by migrating a CLDNN network in a source domain to a target domain through migration learning, and the CLDNN network in the source domain is a network of a cascade CNN network, an LSTM network and a DNN network; and compensating the baseband signal through the nonlinear damage of the optical fiber. According to the technical scheme, the calculation complexity of the algorithm can be reduced, meanwhile, the high system transmission performance can be obtained under the low calculation complexity, and the compensation scheme can obtain high universality.

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 utility model belongs to the technical field of optical fiber communication systems, and relates to a remote multifunctional light panel protection device. Comprising a main control board, and the main control board is used for controlling the working states of a 1 * 12OLP optical switch, a 1 * 5OLP optical switch, a-4dB1550nm optical signal generator and a 650nm red light source signal generator according to instructions. The main control board is electrically connected with the 1 * 12OLP optical switch, the 1 * 5OLP optical switch, the-4dB1550nm optical signal generator and the 650nm red light source signal generator; the 1 * 12OLP optical switch is connected with the 1 * 5OLP optical switch, the 1 * 5OLP optical switch is connected with the-4dB1550nm optical signal generator, the 650nm red light source signal generator, the optical core no-load flange, the test IO optical interface and the output optical interface, and the 1 * 12OLP optical switch is connected with the twelve IO optical interfaces; the main control board is connected with a local remote control key, and the local remote control key is used for mutual switching between a local mode and a remote mode. The transmission optical cable line fault testing device can assist in transmission optical cable line fault testing, improves fault testing efficiency, and saves manpower resources.

The invention discloses an optical fiber collimator, isolator and circulator in an orbital angular momentum mode, and belongs to the field of optoelectronic communication devices. Based on a special optical fiber collimator design scheme, the OAM optical fiber collimator which is simple in structure and excellent in performance is realized. On the basis of an OAM optical fiber collimator, an isolation core and an annular core are combined, and an OAM optical fiber isolator and an OAM optical fiber circulator which are low in cost, low in processing complexity, small in occupied size and excellent in performance are respectively realized through a special packaging process. The isolator and the circulator have the characteristics of low insertion loss, high isolation degree, high quality of a transmitted OAM mode and the like. The OAM optical fiber collimator, isolator and circulator realized by the invention can replace free space optical devices with consistent functions in systems such as an OAM mode optical fiber communication system, an OAM optical fiber amplifier and the like. The cost of the mode division multiplexing optical fiber communication system based on the OAM mode is reduced, the flexibility of the system is improved, and the method has important significance for promoting the practicability and miniaturization of the 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 invention discloses a multiband multi-core optical fiber communication system and a communication method, and relates to the technical field of optical communication. A first optical signal is split into a plurality of first wave band signals, the first wave band signals of adjacent wave bands are respectively transmitted to adjacent fiber cores, a second optical signal is split into a plurality of second wave band signals, and the second wave band signals of the adjacent wave bands are respectively transmitted to the adjacent fiber cores. The condition that adjacent wave band signals are transmitted along the same direction does not exist in the same fiber core, and interference caused by the fact that adjacent wave bands are transmitted in the same fiber core along the same direction is directly avoided from a transmission path. Besides, first wave band signals of adjacent wave bands are respectively transmitted to adjacent fiber cores, second wave band signals of the adjacent wave bands are respectively transmitted to the adjacent fiber cores, and the first wave band signals and the second wave band signals of the same wave band are transmitted in different fiber cores, so that in the adjacent fiber cores, the same wave band can only be transmitted along different directions. Crosstalk between adjacent fiber cores is avoided, and the performance of an optical transmission system is improved.

The invention discloses a fault detection method, device, system and equipment for an optical fiber communication system, and relates to the field of fault detection, and the method comprises the steps: obtaining the index data of a first optical module, the index data being used for indicating the operation state of the optical module; performing feature extraction on the index data of the first optical module to obtain first feature data; and determining the fault type of the first optical module according to the first feature data. According to the first feature data obtained by performing feature extraction on the index data of the first optical module, the specific fault type of the optical module can be determined, and the efficiency of determining the fault type of the optical module is improved, so that more specific fault information can be provided for operation and maintenance engineers, the repair work is more targeted, and the repair efficiency is improved. Therefore, the repair efficiency is improved, and the time required for service recovery is reduced.

The invention relates to the technical field of communication transmission, and provides an equivalent simulation method and device for transmission performance evaluation of an optical fiber communication system, and the method comprises the steps: generating a signal power density spectrum of each span according to a link parameter; calculating a nonlinear noise power density spectrum according to the link parameters and the signal power density spectrum of each span; and taking the signal power density spectrum as an input parameter of the equivalent simulation model, and calculating a nonlinear damage index at the tail end of the optical transmission system to obtain transmission performance evaluation. A simulated signal power density spectrum is used for replacing a tested signal power density spectrum, the nonlinear damage simulation precision is still kept under the condition that model parameter dependence is reduced, and a nonlinear model is more flexibly applied to various scenes. According to the calculation method, the algorithm is optimized and upgraded from the two aspects of operation efficiency and input parameter dependency, the problems that a non-linear noise algorithm is low in operation speed and input parameters are difficult to obtain are solved, and the algorithm implementation complexity is reduced while the algorithm simulation precision is guaranteed.