1246results about "Wavelength-division multiplex systems" patented technology

The invention provides a dynamic wavelength allocation method based on DCI wavelength division II type equipment. The method comprises the following steps: acquiring an occupation state and a transmission quality index of each wavelength channel of a current network; establishing a wavelength channel quality evaluation model, and scoring each wavelength channel according to the transmission quality index of each wavelength channel of the network; according to the bandwidth requirement, the priority and the QoS requirement of the service request, generating a traffic characteristic matrix containing the delay sensitivity and the bandwidth requirement through a traffic prediction algorithm; based on a network state and the traffic characteristic matrix, through resource availability calculation and path quality evaluation, forming an allocable wavelength resource pool and a quality score thereof; for the allocatable wavelength resource pool, generating an optimal wavelength allocation scheme by adopting an improved heuristic algorithm and comprehensively considering the resource utilization rate, the signal quality and the service priority; and according to the performance feedback of the optimal wavelength allocation result and the network state change, continuous optimization of wavelength allocation is realized through a self-adaptive adjustment mechanism. The method can effectively deal with the dynamic flow change in the DCI network, improve the resource utilization rate, ensure the signal quality and meet the QoS requirement of the service, thereby providing an efficient and reliable wavelength allocation solution for the data center interconnection network.

The invention relates to the technical field of passive optical networks, in particular to an all-optical Internet of Things access terminal based on a PON network, the terminal carries a control system, and the system comprises a hardware interface dynamic adaptation module, a protocol feature recognition module, an optical wavelength offset control module, an optical transmission bandwidth distribution module and an optical signal compensation module. According to the invention, through dynamic linkage of physical layer parameters of the optical network and the serial interface, signal attenuation of the protocol conversion equipment is eliminated, the access compatibility of the industrial terminal is improved, a control instruction and a conventional data stream are accurately distinguished based on a multi-dimensional protocol feature analysis mechanism, and the risk of misjudgment is reduced; a silent time slot dynamic mapping mechanism realizes fast reconstruction of burst traffic bandwidth, breaks through the bottleneck of traditional bandwidth allocation response, suppresses multi-wavelength channel interference through cooperative adjustment of optical power and phase, maintains low-delay and high-reliability transmission characteristics, and optimizes the whole process to form a closed-loop control link from a physical layer to a transmission layer. And the real-time control requirement of the industrial internet of things is met.

The present disclosure provides a method and related products. The method includes: performing distribution matching on a first bit sequence to obtain a second bit sequence; obtaining at least two candidate bit sequences for the second bit sequence, where each of the at least two candidate bit sequences includes a first bit part for identifying the candidate bit sequence and a second bit part obtained based on interleaving of the second bit sequence; determining a third bit sequence in the at least two candidate bit sequences for channel coding. In this way, distribution matching needs to be performed simply once for the first bit sequence while obtaining at least two candidate bit sequences for the second bit sequence, which can reduce redundant processing and improve overall system efficiency.

The invention discloses an on-chip optical interconnection and switching chip and an application system thereof. Wherein the on-chip optical interconnection and exchange chip is integrated by a power divider, a bidirectional optical transceiver unit and an optical switch unit; the application system of the on-chip optical interconnection and switching chip comprises a multi-wavelength light source used for generating multi-wavelength optical carrier signals, a transceiving unit control and clock module used for bidirectional transceiving unit feedback / amplifier control and clock synchronization, and an optical switching control module used for switching an optical switching unit switching link. The chips and the modules are used for realizing optical interconnection and optical switching of the special electrical computing chip ASIC. According to the invention, bidirectional optical interconnection and exchange of special computing electric chips such as a CPU, a GPU, a DPU and the like can be realized by utilizing an on-chip optical interconnection and exchange technology, the interconnection rate is high, the exchange switching time is short, computing power cluster networking oriented to artificial intelligence application can be supported, and the application prospect is good.

A method for topological design optimization in which a number of objective scattering(S) parameters are initially decomposed into a product of smaller devices (primitives). Each of the primitives are optimized in parallel using inverse design; and the topologies of the smaller devices are then composited into a final device design region, in which the final device design region is an initialization of a final optimization, advantageously saving computation time. According to at least one embodiment, the herein described optimization procedure can be utilized in order to design a composite power combiner that is essentially phase-insensitive.

An electro-optic receiver includes a bus optical waveguide and a plurality of wavelength division multiplexing (WDM) receiver slices positioned along the bus optical waveguide. Each of the plurality of WDM receiver slices includes a WDM element optically coupled to the bus optical waveguide, a photodetector, and a receiver circuit. The photodetector is optically connected to the WDM element by both a first optical connection and a second optical connection. The WDM element conveys a first component of input light through the first optical connection to the photodetector, and a second component of input light through the second optical connection to the photodetector, where first and second components of input light travel in opposite directions through the bus optical waveguide. The receiver circuit generates an electrical data signal from photocurrents received from the photodetector.

The invention relates to a wavelength selection block (WSB-2) for a multi-port optical distribution block (PDB-2). The wavelength selection block (WSB-2) comprises: i) an optical input (INP) for receiving an optical fibre (1) carrying a multi-wavelength optical signal (λA) comprising a first number (K) of individual wavelength optical signals (λ1..λK); and ii) a second number (Y) of optical outputs (OUTP-1..OUTP-Y). The wavelength selection block (WSB-2) comprises four consecutive stages (S1..S4). In a first stage the multi-wavelength optical signal (λA) is split into consecutive individual wavelength optical signals (λ1..λK). In a second stage (S2) each individual wavelength optical signal (λ1..λK) is split into a respective group (GR-1..GR-K) of copies of the respective individual wave-length optical signal (λ1..λK), the number of copies equalling the multiplication factor (Y). In a third stage (S3) each copy of each consecutive group (GR-1..GR-K) of copies is individually gated for selectively passing or blocking the respective individual wavelength optical signal (λ1..λK) so as to obtain a respective gated individual wavelength optical signal (λ1g..λKg). In a fourth stage (S4) each consecutive gated individual wavelength optical signal (λ1g..λg) from each consecutive group (GR-1..GR-K) is combined so as to obtain a respective gated multi-wavelength optical signal (λAg), wherein each respective gated multi-wave-length optical signal (λAg) is coupled with a respective optical output (OUTP-1..OUTP-Y). The invention also relates to an optical distribution block (PDB-2) comprising a further number (N) of such wavelength selection blocks (WSB-2).

The invention relates to the technical field of wavelength division multiplexing, and particularly provides a sparse representation-based lower wave enhancement method of a reconfigurable optical add-drop multiplexer, which comprises the following steps of: performing conversion processing on a lower wave mixed optical signal to obtain a digital electric signal vector; wherein the lower wave mixed optical signal at least comprises a target signal and an interference signal; performing sparse decomposition processing on the electric signal vector based on the over-complete dictionary to obtain a sparse coefficient vector; wherein the over-complete dictionary at least comprises target signal atoms and interference atoms; identifying and extracting a target coefficient corresponding to the target signal atom from the sparse coefficient vector; and combining the target coefficient with the target signal atoms to obtain an enhanced target signal. According to the sparse representation-based lower wave enhancement method for the reconfigurable optical add drop multiplexer, provided by the invention, the accuracy of extracting a target signal in ROADM lower waves can be improved, and adjacent channel interference and noise are effectively inhibited, so that the performance is improved.

A coherent optical injection locking (COIL) apparatus generates multiple optical source outputs from a single optical source generated by a parent laser. The COIL apparatus includes a plurality of optical source generators each having a child laser, of lesser performance than the parent laser, that is injection locked to the single optical source. The optical source generators may have one or both of a shared configuration and a cascaded configuration that replicates the single optical source, or a single wavelength of the single optical source when it is a comb source.

The invention discloses an optical fiber wireless heterogeneous network intelligent monitoring system and method based on energy-information co-transmission, and relates to the technical field of optical fiber wireless heterogeneous network intelligent monitoring, the system comprises a central base station unit, an energy-information co-transmission optical fiber transmission unit and a micro-nano integration unit; the central base station unit is integrated with a high-power laser with a first preset wavelength, a light receiving unit with a second preset wavelength and a data processing subunit; the high-power laser is used for generating an optical signal for transmitting energy; the light receiving unit is used for receiving monitoring data; the data processing subunit is used for realizing clock recovery, code element synchronization, serial decoding and data display functions; and the energy-information co-transmission optical fiber transmission unit takes a multi-core optical cable as a physical carrier and adopts a wavelength division multiplexing technology to realize isolated transmission of energy and information, one end of the energy-information co-transmission optical fiber transmission unit is in communication connection with the central base station unit, and the other end of the energy-information co-transmission optical fiber transmission unit is in communication connection with each micro-nano integrated monitoring unit.

A WXC device includes: input ports; output ports; a wavelength conversion unit including input-side WSSes, wavelength converters, and output-side WSSes; and a controller. The input-side WSSes each output an optical signal input from a corresponding one of the input ports to a selected one of the wavelength converters. The wavelength converters each convert a wavelength band of the optical signal input from each of the input-side WSSes into another wavelength band and output the converted optical signal to a respective one of the output-side WSSes. The output-side WSSes each perform route switching on the optical signal input from the respective one of the wavelength converters toward a selected one of the output ports. The controller manages, for each of the wavelength converters, whether the wavelength converter is unused and controls the input-side WSSes each to output the input optical signal to one of the unused wavelength converters.

The invention relates to the technical field of subkeys and communication, discloses a quantum key distribution and wavelength division multiplexing cooperative scheduling method for a metropolitan optical network, and aims to solve the problems of insufficient key rate and classic service quality reduction caused by mutual interference of quantum signals and classic services in a shared optical fiber. The method comprises the following steps: modeling Raman scattering and crosstalk noise between quantum and classical signals; constructing a joint optimization model which aims at minimizing classic service degradation and ensures that the quantum key rate is not lower than a threshold; solving wavelength, power and routing allocation by combining mixed integer programming and an intelligent algorithm; the key generation window and the reconfiguration wavelength are dynamically scheduled based on the service load prediction; according to the technical scheme, dual optimization of safety performance and network resource utilization efficiency can be realized.

The invention relates to the technical field of optical communication, in particular to a wavelength adaptive configuration method of a CWDM / DWDM hybrid wavelength division system, which comprises the following steps of: acquiring physical layer parameters of an optical fiber link in real time; outputting the OSNR margin and the nonlinear noise prediction value of each wavelength position; dynamically adjusting the reservation proportion of the channel; collaboratively optimizing bandwidth, time delay, damage and cost constraints in path calculation through a reinforcement learning algorithm; splitting the CWDM channel into virtual sub-channels, or combining the virtual sub-channels to generate a super-channel; compared with the prior art which depends on an empirical formula to estimate transmission damage and has the defects of extensive modeling and cross-band crosstalk missing detection, the method provided by the invention has the advantages that a power spectrum, a temperature gradient and nonlinear interaction are analyzed in real time through an LSTM-GNN combined architecture, and a mixed channel damage map covering a full frequency band is constructed; the method has the advantages that cross damage of a CWDM wide channel and a DWDM dense area is accurately quantified, and high-crosstalk wavelength combination is dynamically avoided.

An optical communication system includes a transceiver device and a passive multiplexer and demultiplexer (PMAD). The transceiver device transmits or receives optical signals. The PMAD has a Mach-Zehnder interferometer structure, is connected to the transceiver device, and operates as a passive multiplexer or a passive demultiplexer. The PMAD includes: a first arm including a first waveguide, the first arm having a first dimension; a second arm including i) a second waveguide, and ii) a third waveguide, the second waveguide having a second dimension, the third waveguide having a third dimension, the second dimension being based on the first dimension and finely adjusts at least one performance parameter of the passive multiplexer and demultiplexer, and the third dimension being based on the first dimension and coarsely adjusts the at least one performance parameter; and a splitter and a coupler that propagate the optical signals.

The invention discloses a cascade architecture power electronic control and protection device and a high-frequency carrier generation method. The cascade architecture power electronic control and protection device comprises a controller, an optical port case and a plurality of power modules, the controller is provided with a high-speed optical fiber communication interface, each optical port case is provided with a high-speed optical port and a plurality of low-speed optical fiber communication interfaces, and the high-speed optical port is connected with the high-speed optical fiber communication interface of the controller through a high-speed optical fiber; each power module is connected with one low-speed optical fiber communication interface through a low-speed optical fiber, and each power module is used for receiving a control signal through the optical port case. The method can be applied to various power electronic products in a butt joint mode, the calculation burden of a controller is reduced, and large-capacity high-frequency carrier processing can be completed without a high-performance controller.

Some embodiments relate to a communication network comprising at least one receiver system optically coupled to a plurality of transmitter systems for transmission of synchronization signals generated by the at least one receiver system to the plurality of transmitter systems over a unidirectional synchronization channel. The at least one receiver system configured to embed into the synchronization signals thereby generated additional data indicative of an internal time count thereof for synchronization of transmission of data / signals from each one of the plurality of transmitter systems to said at least one receiver system over a sparse data / signals unidirectional communication channel.

The application provides a communication device, a base station and a communication system. The communication device comprises a power divider, a coupler group and a multiplexer connected in sequence. The power divider is connected with the coupler group through at least two first lines. The power divider can divide light into at least two light beams. Each light beam is transmitted to the coupler group through a first line. Transmission of any two light beams in the corresponding first line has a phase difference and a time difference. The coupler group couples and interferes the received at least two light beams, and outputs at least two coupled light beams. Each coupled light beam enters the multiplexer through a second line. Transmission of any two coupled light beams in the corresponding second line has a time difference. The multiplexer can orthogonally combine the received coupled light beams. The communication device can perform dispersion compensation on the light to suppress pulse broadening, thereby reducing the bit error rate of optical signal transmission and reducing the power loss of the optical signal.

A method for determining a bitrate allocation of a plurality of optical channels in an optical transmission link with discretized channel bitrates, the method comprising determining an initial discretized bitrate allocation and a corresponding initial power allocation for the plurality of optical channels for supporting the initial discretized bitrate allocation with the proviso that all optical channels meet a pre-defined optical signal-to-noise, OSNR, threshold for the respective initial discretized bitrate allocated to the respective optical channel; starting from the initial power allocation, varying, for an investigated optical channel of the plurality of optical channels, a channel power of the investigated optical channel to estimate a highest supported discretized bitrate for the investigated optical channel, wherein the highest supported discretized bitrate is the highest discretized bitrate for which the investigated optical channel meets a corresponding OSNR threshold; including the investigated optical channel in an upgrade candidate subset of the plurality of optical channels for potential bitrate upgrades based on the highest supported discretized bitrate exceeding the initial discretized bitrate for the investigated optical channel; and providing the upgrade candidate subset to an upgrade allocation algorithm.

The invention relates to the technical field of satellite-ground laser communication, and discloses a banyan-shaped network communication method and system based on multi-beam multipath transmission and space diversity synthesis aperture reception. The method comprises the following steps: dividing a light beam into a plurality of beams at a satellite-based terminal through beam forming to point to a plurality of ground stations; multiple ground stations receive data in parallel and then gather the data to a data center for time-space synchronization; and the data center adopts a multi-branch neural network to intelligently fuse the synchronized data so as to reconstruct a signal. According to the invention, by constructing the satellite-to-ground collaborative architecture, signal interruption and data loss caused by atmospheric turbulence are effectively suppressed, the limitation of high-error-code communication is broken through, and remote, high-speed and high-reliability satellite-to-ground communication is realized.

An optical transmission apparatus includes an optical transmitter that generates an optical signal in an uplink direction by modulating output light of a laser that outputs light of a first frequency with a subcarrier on which transmission data is superimposed, a heterodyne detection unit that receives an optical signal in a downlink direction by heterodyne detection, a control unit that calculates a first intermediate frequency based on the frequency of the downlink signal received by the heterodyne detection and the first frequency of the laser, and controls the first frequency of the laser when there is a difference between the calculated first intermediate frequency and a reference second intermediate frequency by a threshold or more.

A reconfigurable optical add / drop multiplexer using a wavelength selective switch (WSS) component to multiplex wavelength channels into a wavelength division multiplexed (WDM) signal. When a given channel is dropped, an amplified spontaneous emission (ASE) injection signal is multiplexed as a ghost channel into the WDM signal. The ASE injection channel can mitigate polarization hole burning and can provide a fuller power spectrum density. However, the ASE injection channel also defines a monitoring window. As an optical channel monitor (OCM) monitors the WDM signal, the OCM can detect, within the monitoring window, any underlying characteristic of the given wavelength channel. In this instance in response to the detected characteristic, the WSS component switches from multiplexing the ghost channel into the WDM signal to multiplexing the given wavelength channel into the WDM signal.

The invention relates to the technical field of optical communication, in particular to a front optical fiber amplifier with a power balancing function. On the basis of a traditional Er-doped optical fiber amplifier, incident light is divided into a signal link and a competition link through a light splitting device with a fixed proportion. The purpose of introducing the competitive link is to generate a competitive wavelength which has an obvious competitive effect with the signal light in the EDF, and gain competition is carried out in the amplification process of the signal light in the EDF; wherein the competitive link finishes conversion from signal light wavelength to wavelength with obvious competitive effect by adopting a four-wave mixing principle based on HNLF, and then reversely inputs the converted competitive light into the EDF of the signal link to carry out a light amplification process with gain competition, so that the aim of reducing the output power fluctuation range after the signal light is amplified by the EDF is fulfilled.

Parallel optical transponders with an optical comb source, and methods of using the same, are provided. The optical comb source can provide multiple optical carriers from a single source. The multiple optical carriers can be phase-aligned, which can allow joint processing of a received signal. The multiple optical carriers can also allow for modulating a demultiplexed data signal using multiple modulators rather than modulating the entire data signal using a single modulator.

The invention discloses a multi-service isolation method, system and device based on optical fiber communication and a medium, and relates to the technical field of data processing, and the method comprises the steps: obtaining the priority and bandwidth requirements corresponding to each service, and obtaining the distribution channel wavelength corresponding to each service according to the priority and bandwidth requirements corresponding to each service; obtaining a single time slot bearing capability, and obtaining a distribution isolation time slot corresponding to each service according to the distribution channel wavelength corresponding to each service and the single time slot bearing capability; obtaining the isolation degree between the services according to the distribution channel wavelength and the distribution isolation time slot corresponding to each service; and comparing the isolation degree with a preset isolation threshold value, and if the isolation degree is smaller than the preset isolation threshold value, correcting the allocated channel wavelength and the allocated isolation time slot of the two services corresponding to the isolation degree according to the isolation degree and the preset isolation threshold value, and generating a target channel wavelength and a target isolation time slot. The system has the advantages of collaborative distribution, bidirectional adjustment and accurate isolation.

The invention discloses a network optimization method and device, a nonvolatile storage medium and electronic equipment. The method comprises the following steps: when it is detected that a topology change event occurs in a network to be detected, obtaining description information of the topology change event; updating an original network topological graph of the to-be-detected network according to the description information of the topology change event to obtain a target network topological graph; a weight vector of each optical fiber link in the target network topological graph is determined, a wavelength prediction result of each optical fiber link is determined, the weight vector is used for quantifying the importance degree of a service executed by the optical fiber link to the network to be detected, and the wavelength prediction result is used for indicating a frequency spectrum fragment index of the wavelength of the link in a future time period; and determining a decision result according to the weight vector and the wavelength prediction result, the decision result being used for indicating a spectrum resource allocation strategy of the to-be-detected network after the topology change event occurs.

A controller maps a plurality of client-side traffic ports to a plurality of line-side optical ports of a wavelength division multiplexing system, that are operatively coupled to at least one optical long haul link. The controller determines idle traffic overhead associated with at least one mapped client-side traffic port of the plurality of client-side traffic ports. The controller determines that there is underutilized bandwidth capacity in at least a first line-side optical port in the plurality of mapped line-side ports that would reduce a need for use of at least a second line-side optical port. The controller logically remaps at least one client-side traffic port from the second line-side port to the underutilized first line-side optical port in response to determining that there is underutilized bandwidth capacity of the first line-side optical port.

Optical add-drop multiplexers (OADMs) connect two or more network terminals in an optical network to perform wavelength division multiplexing. If a channel in an optical connection between an OADM and a terminal is interrupted for any reason such that the signal in the channel drops, transient effects such as spectral hole burning may occur which impacts neighboring channels. One approach to avoiding such transient effects in channel drop scenarios includes filling in the spectral hole so that neighboring channels are transmitted without any degradation. An OADM includes a broad spectral source, such as an amplified spontaneous emission (ASE) source, and an optical switch that replaces dropped channels with ASE. By providing an automatic mechanism for spectrum filling within the OADM itself in this way, high-capacity optical transmission networks are stable against transient effects even in the presence of channel drops or fiber cuts.

Embodiments of the present disclosure provide a signal light processing method, an electronic device, and an optical transmission system. The method is applied to an optical transmission system, and an optical switch is deployed on a transmission link of the optical transmission system. The method comprises: on a transmission link, determining an initial sub-transmission link which is triggered by an optical switch and is in an on state; determining a link switching condition corresponding to the initial sub-transmission link, wherein the link switching condition is used for indicating a condition under which the optical switch triggers a switching operation on the initial sub-transmission link; detecting whether signal light of an optical cable satisfies the link switching condition, and if the signal light of the optical cable satisfies the link switching condition, controlling the optical switch to trigger the switching operation on the initial sub-transmission link to obtain a target sub-transmission link in an on state; and outputting signal light on the target sub-transmission link, wherein the signal light on the target sub-transmission link satisfies signal light required by an optical transmission system.

To provide an optical transport device that enable the strengths of optical signals to be recovered when the strengths of the optical signals vary, an optical transmission device comprises: a wavelength selection switch that attenuates, in accordance with an attenuation amount, each of a plurality of optical signals outputted from a plurality of optical transmitter, multiplexes and outputs the attenuated optical signals; and an optical detector that detects and compares the strength of at least one of the plurality of optical signals with a first threshold value and a second threshold value higher than the first threshold value. On the basis of the result of said comparison, the wavelength selection switch controls the attenuation amount such that the optical signal the strength of which has been detected has a strength value between the first threshold value and the second threshold value.

The invention discloses a signal light processing method, electronic equipment and a light transmission system. The method is applied to an optical transmission system, an optical switch is deployed on a transmission link of the optical transmission system, and the method comprises the following steps: on the transmission link, determining an initial sub-transmission link which is triggered by the optical switch and is in a conduction state; determining a link switching condition corresponding to the initial sub-transmission link, the link switching condition being used for representing a condition that the optical switch triggers to execute a switching operation on the initial sub-transmission link; detecting whether the signal light of the optical cable meets a link switching condition, and if the signal light of the optical cable meets the link switching condition, controlling the optical switch to trigger to execute switching operation on the initial transmission sub-link to obtain a target transmission sub-link in a conducting state; and outputting the signal light on the target sub-transmission link, the signal light on the target sub-transmission link satisfying the signal light required by the optical transmission system. The technical problem that the signal light processing effect is poor is solved.