968results 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 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.

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 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.

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 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.

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.

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 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.

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.

In one embodiment, an optical transceiver includes a digital signal processor, a transmitter coupled to the digital signal processor, and a receiver coupled to the digital signal processor. The receiver is configured to receive an optical signal. The receiver includes a demultiplexer for optical demultiplexing of the optical signal into a plurality of channels, and a plurality of dispersion management devices. Each of the dispersion management devices is associated with a respective channel of the plurality of channels of the demultiplexer and is configured for dispersion compensation at the respective channel. Each of the dispersion management devices includes a thermal control component configured to thermally adjust the dispersion compensation by the dispersion management device based on an output of the digital signal processor.

The invention provides an energy-information collaborative optimization system and optimization method.The optimization system comprises a reverse communication module, a collaborative control unit, a pump laser and an optical phase conjugation module which are connected in sequence, and the reverse communication module is connected with a receiving end of an optical fiber energy-information co-transmission system; the optical phase conjugation module is used for acquiring output electric power of a receiving end photocell and a communication performance index for representing communication quality, and is arranged at a midpoint position of an optical fiber link; the cooperative control unit is used for reading the output electric power of the photocell and the communication performance index acquired by the reverse communication module and dynamically adjusting the output of the pump laser based on the output electric power of the photocell and the communication performance index, so that the phase conjugation efficiency of the optical phase conjugation module is changed; therefore, the value of the comprehensive performance function is maximized. According to the energy-information collaborative optimization system and optimization method, collaborative optimization of communication quality and energy transmission efficiency can be realized.

The invention provides a submarine optical cable bidirectional loopback detection device and method based on wavelength division multiplexing, and belongs to the technical field of optical fiber communication precision detection and intelligent analysis. Through the first detection shore station A module, the pulse control processor generates a downlink detection pulse to respectively drive an uplink detection pulse optical signal and a downlink detection pulse optical signal to a main optical fiber; the pulse control processor analyzes the first transmitting and receiving time delay and the first signal attenuation; a second detection shore station B module, wherein the pulse control processor generates an uplink detection pulse; analyzing the second transmitting and receiving time delay and the second signal attenuation, and comparing the first transmitting and receiving time delay and the first signal attenuation; the double-loop module is used for separating, converting and coupling the uplink detection pulse optical signal and the downlink detection pulse optical signal to a main optical fiber for returning; and the intelligent master control processing module is used for measuring the phase of the bidirectional loopback signal and the amplitude change of the loopback signal, detecting and judging whether the uplink signal and the downlink signal are normally received or not, and performing accurate fault positioning and intelligent fault cause analysis and detection by combining with signal time delay.

An Optical Time-Domain Reflectometer (OTDR) trace correction method, an electronic device, and a storage medium are disclosed. The method may include: establishing a parameter decoupling equation according to a fiber loss coefficient and a Stimulated Raman Scattering (SRS) transfer coefficient in response to ignoring an SRS transfer amount amplified or absorbed by an OTDR wavelength in an Optical Transport Network (OTN) service; disabling a service wavelength of an OTN of an optical fiber transmission system, and acquiring, according to the parameter decoupling equation, a first OTDR trace of an OTDR simulation wavelength in the optical fiber transmission system when the service wavelength of the OTN is in a disabled state; determining a fiber loss coefficient according to the first OTDR trace.

A system for activating multi-rate optical network units (ONUs) includes an optical network having an optical line terminal (OLT) optically coupled to a plurality of ONUs, including one or more multi-rate ONUs configured to support multiple upstream rates. During discovery when other ONUs are permitted to transmit in the same quiet window, a multi-rate ONU that supports a higher rate is instead configured to send a discovery response at a sufficiently low rate so as not to require training of an equalizer, thereby allowing for a short preamble for the discovery response. Thereafter, during a quiet window for ranging when only the multi-rate ONU will be transmitting to prevent data collisions, the multi-rate ONU is transitioned to a higher rate and transmits a message with a sufficiently long preamble to train an equalizer at the OLT.

Scalable multi-band wavelength division multiplexing (WDM) transceiver architectures suitable for high-bandwidth optical Compute interconnects (OCI) between computing resources. The WDM wavelength range is divided into two or more color / wavelength bands. Each band of WDM optical signals may be coupled through separate semiconductor optical amplifiers (SOAs) that are tuned to the different bands. The bands may be conveyed through an optical MUX / DeMUX for transmission through an optical fiber. The optical MUX / DeMUX may comprise a band MUX / DeMUX or a polarization MUX / DeMUX.

Provided in the present disclosure are a filler-wave management method and system, and a control device, a storage medium and a computer program product. The method comprises: on the basis of first optical power of a filler wave generated by a filler-wave unit of a filler-wave management system, a control unit of the filler-wave management system adjusting the optical power of the filler wave, and / or on the basis of second optical power of wavelength-division-multiplexing (WDM) optical signals generated by an optical-layer unit of the filler-wave management system, the control unit of the filler-wave management system adjusting the optical power of the WDM optical signals, wherein the WDM optical signals comprise WDM optical signals, which are in M directions and are generated by means of the optical-layer unit performing WDM on a service wave and the filler wave generated by the filler-wave unit of the filler-wave management system, M being an integer greater than or equal to 1, and the filler wave is generated by the filler-wave unit by using N light sources, N being an integer greater than 1.

The invention discloses a multidimensional communication sensing system integrating an optical transmission network and BOTDR / DAS distributed sensing, and relates to the technical field of optical fiber communication and optical fiber sensing. The system comprises an OTN transmission subsystem, an optical fiber link and a BOTDR / DAS fusion sensing subsystem. Wherein the OTN transmission subsystem is used for realizing high-capacity data transmission through an optical fiber link; and the BOTDR / DAS fusion sensing subsystem is used for realizing strain, temperature and vibration distributed measurement of an optical fiber link through a Brillouin scattering and Rayleigh backscattering mechanism. According to the system, a double-self-heterodyne demodulation architecture and a reverse wavelength division multiplexing mechanism are adopted, cooperative demodulation and high-isolation transmission of BOTDR and DAS signals are achieved under the common-fiber condition, and high-speed communication and distributed temperature, strain and vibration synchronous monitoring within the 100 km range can be achieved. According to the method, a technical foundation can be laid for realizing physical layer intelligentization of the in-service power OTN.

An optical circulator includes a first polarization beam splitter member having a common optical port, a second polarization beam splitter member having an emittance optical port and at least two receiving optical ports, and a first polarization adjustment member. The two receiving optical ports respectively receive two linearly polarized light beams. The two linearly polarized light beams respectively pass through the second polarization beam splitter member, and sequentially pass through the first polarization adjustment member and the first polarization beam splitter member to be combined into a first combined light beam for being output from the common optical port. The common optical port receives a compound optical signal that passes through the first polarization beam splitter member to be split into another two linearly polarized light beams that are combined into a second combined light beam for being output.

The application relates to a photonic tensor calculation method, a photonic tensor core, a computer device and a storage medium. The method comprises the following steps: generating a multi-wavelength optical signal, modulating optical signals of each wavelength in the multi-wavelength optical signal through a first loopback arrayed waveguide grating, and multiplexing to obtain a first optical signal with multiple wavelengths; splitting each first optical signal to obtain a plurality of first optical signal copies, and modulating optical signals of each wavelength in a single first optical signal copy through a plurality of second loopback arrayed waveguide gratings, and multiplexing to obtain a second optical signal; and photoelectrically converting each second optical signal to obtain a tensor calculation result. The method can improve the photonic tensor calculation accuracy and scalability.

A system including multiple processing devices such as application-specific integrated circuits (ASICs). Each processing device is provided with light at one or more wavelengths. Each processing device outputs data, at the wavelength of the optical signal received, to one or more interfaces. Each interface outputs a multiplexed signal containing data from each of the processing devices on a single optic fiber.

This invention provides a method for easily manufacturing a wavelength division device having multiple channels. [Solution] The wavelength division device includes a substrate having one or more grooves, a plurality of filter bars disposed in one or more of the grooves of the substrate, and a prism disposed on the substrate. Each of the filter bars corresponds to an optical filtering wavelength. The prism is used to cover the plurality of filter bars. The surface of the substrate is etched to form one or more of the grooves. After the plurality of filter bars are coated, the plurality of filter bars are joined in one or more of the grooves of the substrate. The resin disposed on the substrate is imprinted by a processing mold to form the prism.

In an example aspect, an optical switch provided. The optical switch comprises a plurality of reconfigurable add / drop multiplexers (ROADMs), each comprising a plurality of optical line ports and a plurality of add / drop ports. The optical switch also comprises a connection apparatus connecting, for each ROADM, each add / drop port of the ROADM to a port of each of a respective one or more other ROADMs. In another example aspect, a method of configuring an optical switch is provided.

The invention relates to the technical field of optical fiber communication, and discloses a fault positioning device and method for a passive optical network, the device mainly comprises an optical link terminal, an optical distribution network and an optical network unit, the optical link terminal comprises a communication light generation unit, a detection light generation unit, a first wavelength division multiplexer and a fault positioning unit, the optical distribution network comprises a second wavelength division multiplexer, a first optical splitter, a second optical splitter, a plurality of optical encoders and a plurality of third wavelength division multiplexers, the second wavelength division multiplexer is used for separating the mixed light into communication optical signals and detection optical signals, and the first optical splitter is used for distributing the communication optical signals; a plurality of output ends of the second optical splitter are respectively connected to input ends of a plurality of optical encoders, each optical encoder performs time domain encoding on the detection optical signal, and an output end of each optical encoder is connected with a second input end of the third wavelength division multiplexer. According to the invention, high-efficiency, accurate and intelligent positioning of the high-splitting-ratio passive optical network fault is realized.

An optical communication device includes a signal multiplexing unit that multiplexes a plurality of client signals and a signal transmission unit that converts a first multiplexed signal obtained by the multiplexing to an optical signal and transmits the optical signal. The optical communication device is a device capable of receiving data traffic greater than data traffic corresponding to a predetermined communication bandwidth.