98results about "Bidirectional transmission" patented technology

The invention provides a communication device and system. The device is applied to an optical fiber communication point-to-multipoint framework. The device comprises an optical module, a processing module, a first element and a second element. The first element is used for acquiring a second signal, and correlation exists between the second signal and the first signal. The first signal includes a signal received by the communication device. The second element is configured to couple a second signal to a transmit link of the communication device. The optical module is also used for converting the second signal into an optical signal and transmitting the optical signal to slave optical equipment associated with the communication device in a point-to-multipoint architecture. According to the invention, the problem of hidden nodes in a point-to-multipoint architecture based on optical fibers can be solved, and the performance and stability of a Wi-Fi network are improved.

Conventional high performance computer connections are electron-based systems, which require the memory packages to be as close as mechanically possible to the computation engine. Low power and high bandwidth communication, e.g. photonic, links can drastically change the architecture of high-performance computers by eliminating the bottlenecks in communication and augment existing memory systems to allow them to be both high capacity and high bandwidth simultaneously. A computer system comprises: a plurality of memory aggregation devices configured to retrieve data from and store data in a plurality of random access memory modules forming a unified contiguous memory address space disaggregated from a processing unit; a plurality of computational devices configured for simultaneously launching a plurality of data signals including memory read and / or write requests for the data to the plurality of memory aggregation devices; and a plurality of communication links coupling each of the plurality of memory aggregation devices to each of the plurality of computational devices for transferring the data therebetween.

The invention belongs to the technical field of deterministic transmission, and particularly relates to a deterministic transmission method for a time division multiplexing passive optical network in computing power-power cooperative communication network networking, which comprises the following steps of: acquiring and identifying all time delay sensitive flows accessed to a TDM-PON (Time Division Multiplexing-Passive Optical Network), and pre-classifying periodic flows; clustering the similar periodic flow to form a shaping flow, and distributing a shaping window; calculating the least common multiple of all shaping flow periods as a super period; in a super cycle, an integer linear programming model is adopted to complete initial optimization time window distribution; carrying out secondary sorting and conflict elimination on the overlapped transmission windows, and scheduling the shaping stream by using the transmission windows after secondary optimization; the non-periodic flow is scheduled by using the idle time slot in the over-period; and continuously multiplexing a super-cycle scheduling scheme to complete a deterministic transmission process. According to the invention, high scheduling success rate, millisecond-level deterministic time delay and microsecond-level jitter control of large-scale periodic services are realized.

An optical-layer module, an access site, and an optical signal processing method are provided, and relate to the field of optical communication technologies. In this application, in optical-layer wavelength-drop processing, the access site performs splitting through a splitter in a broadcast manner. A wavelength-drop wavelength is not fixed, so that the access site has a colorless capability. In wavelength-add processing, to prevent a conflict between a wavelength-add wavelength and an optical signal (that is, a pass-through optical signal) in a main line, a wavelength-add blocker (for example, an optical switch) blocks a wavelength-add signal that has a conflict, thereby avoiding crosstalk between the wavelength-add signal and an existing signal in the main line. Both each wavelength-drop port and each wavelength-add port in an optical-layer board provided in this application support being multiplexed as extended ports. Port extension can improve flexibility of network deployment. In addition, a new board is developed to increase a quantity of ports, thereby reducing development resources and development costs.

Device topologies for monolithic electro-photonic integrated circuits comprising optical transmitters and receivers are disclosed, wherein each transmitter comprises a first electro-absorption modulator (EAM) waveguide and EAM driver electronics and each receiver comprises a waveguide photodiode, which may be a second EAM waveguide, and a transimpedance amplifier (TIA); and an optical input port for coupling an external laser to each of the transmitters, or an on-chip laser. Monolithic integration of photonics and electronics on a single chip with compact form factor provides reduced interconnect path lengths between the EAMs and the electronics compared to discrete electronics. Tx optical output ports and Rx optical input ports may be interleaved, or banked, along a first (beachfront) edge of the chip with a port-to-port spacing of ≤350μm. The epitaxial layer structure may be fabricated from InP-based materials providing electronics layers comprising InP HBTs, and overlying photonics layers providing first and second EAM waveguides.

The application provides a kind of based on optical band-stop filter complex double sideband signal direct detection method and system, the method and system are based on optical band-stop filter receiver in receiving end setting, the receiver is divided into two categories according to structure, one kind is based on optical band-stop filter and 90 degree mixer receiver, one kind is based on optical band-stop filter and 2x2 coupler receiver.The application is realized by setting optical band-stop filter to help complex double sideband signal optical field recovery, then square law detection is carried out using photoelectric detector to estimate SSBI, finally subtracts the estimated SSBI from the reconstructed complex signal.By the receiver, the SSBI caused by direct detection can be effectively suppressed, thereby realizing optical field recovery under low CSPR.Compared with the existing double sideband self-coherent method, the required CSPR is significantly reduced, and the OSNR sensitivity of the system is also significantly improved.

The present application relates to a kind of multi-agent deep Q network optimization indoor VLC-RF resource energy efficiency allocation method, belong to optical wireless communication technical field.The present application is to improve the system energy efficiency of VLC-RF heterogeneous network, user is abstracted as the agent of deep Q network, user selects the action of VLC-RF access point, power distribution and subcarrier resource allocation is abstracted as the action of agent, the product of the proportional fair satisfaction degree value that considers user to the communication rate alliance satisfaction or to the channel reliability alliance satisfaction and system energy consumption profit value is designed as the reward Q value of deep Q network, using a variable greed factor control agent's alliance conversion, obtains the access AP channel state of user side emphasis;Then, using deep Q network selects the action of maximum Q value for user, optimizes multiple user association access point in VLC-RF system, access point transmission power and subcarrier resource allocation.The proposed method can improve the system energy efficiency of VLC-RF while increasing user satisfaction.

The application discloses a microwave photon frequency hopping signal generation device and method based on an optical switch and belongs to the technical field of optical communication. The application is composed of a light source, a beam splitter, an optical frequency comb generator, an electro-optical frequency shifter, an acousto-optic modulator, a digital frequency synthesizer, a filter array, a signal control unit, an electrically controlled high-speed optical switch, a beam combiner and a photoelectric detector. The application separates optical frequency comb teeth by using an ultra-narrow bandwidth optical filter, selects and opens the frequency hopping signal generated by the local light beat frequency through the optical switch, and can generate a high-speed high-order high-stability frequency hopping signal compared with the prior art.

To provide an optical transmission device, an optical transmission system, and an optical transmission method that suppress an OSNR penalty due to return light.SOLUTION: An optical transmission device disposed at a fiber end of a single-core optical fiber and used when signal light is bidirectionally transmitted through the optical fiber, the optical transmission device comprising an optical transmitter configured to transmit first signal light in one direction belonging to the signal light, an optical receiver configured to receive second signal light in a reverse direction belonging to the signal light, and a controller configured to guide the first signal light transmitted from the optical transmitter to the optical fiber, An optical circulator configured to guide the second signal light from the optical fiber to the optical receiver; and a light source configured to output, to the optical fiber, excitation light that Raman-amplifies the second signal light to second optical power higher than first optical power of the first signal light.SELECTED DRAWING: Figure 2

The invention provides a coaxiality correction optical system and a coaxiality correction method and device, and relates to the technical field of laser communication.The coaxiality correction optical system comprises a light emitting and processing module, a light transmission module, an emitting correction module, a receiving correction module and a detection module; the spontaneous radiation light generated by the light emitting and processing module for laser communication is used as the calibration light source, so that an independent calibration light source does not need to be additionally arranged, and the light path complexity of the laser communication terminal is effectively reduced; and the same detection module is used for imaging the spontaneous radiation light, the reflected light of the emitted first signal light and the reflected light of the received second signal light, so that the coaxiality of the emission optical axis, the receiving optical fiber optical axis, the tracking receiving optical axis and the calibration emission optical fiber optical axis of the laser communication terminal is monitored and corrected in real time at the same time. Accurate real-time monitoring and correction of the coaxiality of the transmitting and receiving optical axes of the laser communication terminal are realized.

An optical communication system includes: an optical fiber including a plurality of cores; a first optical communication device provided with an optical transmission unit and an optical reception unit each connected to one end of one of the cores on an interface surface; and a second optical communication device provided with an optical transmission unit and an optical reception unit each connected to another end of any one of the cores on an interface surface, in which one of the connection ends of the first optical communication device and of the second optical communication device being in a line-symmetric positional relationship with respect to a vertical line to a horizontal plane of when the first optical communication device and the second optical communication device are installed on the horizontal plane such that the interface surfaces of the first optical communication device and the second optical communication device face a front.

A dummy light transmission method, a dummy light identification method, and a related device. A light emitting apparatus performs spectrum shaping on first multi-wavelength dummy light generated by a dummy light source, to obtain second multi-wavelength dummy light, so that a spectral feature of the second multi-wavelength dummy light is different from a spectral feature of service light. The light emitting apparatus selects target dummy light from the second multi-wavelength dummy light to fill an idle band. A light receiving apparatus receives the service light and the target dummy light from the light emitting apparatus. Because the target dummy light and the service light have different spectral features, the light receiving apparatus can effectively distinguish the service light from the target dummy light through spectrum detection and spectrum analysis.

Embodiments of this application disclose a dummy light transmission method, a dummy light identification method, and a related device. Specifically, a light emitting apparatus performs spectrum shaping on first multi-wavelength dummy light generated by a dummy light source, to obtain second multi-wavelength dummy light, so that a spectral feature of the second multi-wavelength dummy light is different from a spectral feature of service light. The light emitting apparatus selects target dummy light from the second multi-wavelength dummy light to fill an idle band. A light receiving apparatus receives the service light and the target dummy light from the light emitting apparatus. Because the target dummy light and the service light have different spectral features, the light receiving apparatus can effectively distinguish the service light from the target dummy light through spectrum detection and spectrum analysis. It should be understood that a manner of constructing a spectral feature through spectrum shaping is simple to implement, and no additional modulation needs to be performed on dummy light.

The present application relates to a kind of on-orbit optical axis fast calibration method of spaceborne laser communication terminal, to improve the pointing accuracy and stability of spaceborne laser communication system.The present application realizes the fast and accurate calibration of the optical axis of laser communication terminal by the comprehensive application of coordinate system conversion, error correction matrix, least square method optimization and golden section method etc.Technical means, the present application has comprehensively applied complex coordinate system conversion and error correction matrix, realizes the high-precision correction of theoretical pointing vector;Golden section method is used in combination with the optimization strategy of least square method, the convergence speed and accuracy of calibration process are improved;It has higher real-time and automation degree, can acquire and process relevant data in real time, realizes the real-time correction of optical axis pointing error;It has wide applicability and scalability, can be applied to other spacecraft systems needing high-precision pointing control.

The invention discloses a computing chip, a laser radar, a controller, an optical communication system and a vehicle, relates to the technical field of vehicles, and aims to solve the problems of low computing power and high power consumption of a whole vehicle in related technologies. The computing chip comprises an electric computing sub-chip and an optical computing sub-chip which is in communication connection with the electric computing sub-chip, the optical calculation sub-chip is used for receiving an optical signal carrying to-be-calculated data; obtaining a calculation result based on the optical signal carrying the to-be-calculated data; and a calculation result is output to the electric calculation sub-chip in the form of an electric signal.

A test apparatus and method for testing passive optical networks is provided. The test apparatus includes an optical circuit having an optical coupler for splitting off a portion of optical traffic. During testing of a passive optical network, the optical circuit is coupled into an optical path of the passive optical network. A bit stream corresponding to an activating procedure is captured and analyzed to extract identification information of the module that sent the bit stream.

Provided in the present application are a method for determining a frame header of a data frame, and a device, which method and device can enable a receiving end to frame a fgOTN frame header by means of a lost valid data volume when a fgOTN service is transmitted in a PON system and a packet loss has occurred, thereby ensuring the reliability of service transmission, and further achieving the purpose of improving the system performance. The method comprises: calculating a lost valid data volume on the basis of a first data volume accumulation indication overhead included in a current transmission frame, and determining, on the basis of the lost valid data volume, a frame header of a data frame which bears a service, wherein the first data volume accumulation indication overhead indicates a first accumulation value of a valid data volume borne by N transmission frames, and the N transmission frames include transmission frames sent before the current transmission frame, with N being an integer greater than or equal to 0.

The invention provides a communication method and device. The method is used for configuring relay resources in an optical network. According to the invention, the network element with the capability of serving as the relay resource in the optical network is determined through the obtained indication information, and the relay resource required by the data transmission path during rerouting is determined. The application also determines whether the relay resource is in an available state at the moment when the transmission path is rerouted according to the obtained indication information. Corresponding configuration information is sent to indicate that a first board card in a network element serving as a relay resource is configured to be in a relay mode. According to the method and the device, adaptive switching of the relay board card between the line mode and the relay mode can be realized, so that the success rate of optical layer ASON service rerouting is improved.

The invention relates to the technical field of communication, and provides an optical module access protection method and a related device. The method is applied to a programmable logic device, the programmable logic device is in communication connection with a controller, and the programmable logic device is in communication connection with an optical module through an I2C interface. The method comprises the following steps: receiving access information required by one-time complete reading / writing and sent by a controller, and caching the access information; receiving a one-time read / write access command sent by the controller, and executing an optical module access process according to the access command and the access information; in the process of executing the optical module access process, if a reset signal sent by the controller is received, the timer is triggered, the optical module access process continues to be executed, and when to start reset operation is determined by combining the timing condition of the timer and the execution state of the optical module access process. Therefore, the access efficiency of the optical module is improved, and the risk that the data of the optical module is rewritten is reduced.

A bidirectional multi-channel optical transceiver module includes a package housing, an optical transmitting sub-module, a plurality of optical receiving sub-modules, and a plurality of optical path turning units. The optical transmitting sub-module is housed in the package housing. The optical transmitting sub-module includes an optical transmitting unit and a thin film lithium niobate modulator, and an optical receiving port of the thin film lithium niobate modulator is optically coupled with the optical transmitting unit. The optical receiving sub-modules are housed in the package housing, and the optical receiving sub-modules are configured to receive external optical signals into the package housing. The optical path turning units are respectively optically coupled with a plurality of optical output ports of the thin film lithium niobate modulator. The optical path turning units are configured to change optical path directions of the optical transmitting sub-module, and each of the optical path turning units is configured to enable one of the optical receiving sub-modules to share a fiber port with the optical transmitting sub-module.

The invention provides a reasoning task execution method, system and device, and relates to the technical field of optical fiber communication. The method is performed by a first optical access device in a fiber access network. Comprising the steps of obtaining a to-be-executed reasoning task; obtaining an execution result of the reasoning task; the execution result is obtained by executing the reasoning task through operating different sub-modules in a preset reasoning model by the plurality of target access devices; wherein the target access device comprises other optical access devices capable of communicating with the first optical access device. Through the method, the reasoning time for executing the reasoning task is shortened, the reasoning efficiency is improved, and the resource utilization rate of the optical access equipment is improved.

The invention relates to the technical field of key management, and discloses a key distributed storage and safe calling method and device in an optical fiber communication system, and the method comprises the steps: segmenting a composite key into a plurality of fragments through a threshold secret sharing algorithm, encrypting the fragments through a hardware feature code, storing the index information of the fragments in a block chain alliance chain, and carrying out the encryption through a hardware feature code; storing the encrypted fragments in an IPFS network, and establishing an association relationship between an index and a content addressing identifier; and during calling, identity authentication and permission verification are performed through the smart contract, the encrypted fragments are retrieved from the IPFS network, threshold recombination is performed to restore the key, and integrity is verified through hash comparison. Through a double-layer distributed architecture and a double-protection system, the problems of high single-point fault risk and high key leakage risk of centralized key storage are solved.

Low power and / or low footprint optical communication technologies that support short to medium range exoatmospheric communications and provide bidirectional communication with nearly spherical coverage.

An optical transmission and reception carrier includes an optical fiber, an invisible light transmitter, an invisible light receiver, a visible light transmitter and a fiber optic connector. The invisible light transmitter is configured to emit a first invisible light toward the fiber optic connector and includes a first connection element. The invisible light receiver is configured to receive a second invisible light from the fiber optic connector and includes a second connection element. The visible light transmitter is configured to emit a visible light toward the fiber optic connector. One of the first connection element and the second connection element is a flexible printed circuit board.

The invention provides a Raman amplifier reflected light processing method and system based on weak etching optical fibers, and relates to the technical field of passive optical networks. The method comprises the steps that pump light parameters and surface roughness parameters of weak etching optical fibers are obtained, the pump light parameters comprise pump light power, a prediction reflection domain is generated through a Rayleigh back scattering model, and the prediction reflection domain comprises predicted reflection spectrum peak displacement and a diffusion area; constructing a multi-layer spectrum grid module for the prediction reflection domain, generating a spectrum coordinate unit, and mapping the prediction reflection domain into a coordinate unit mark; and based on the coordinate unit marks, performing non-overlapping comparison of the overall size of the reflected light and the marks to generate an overall verification result, and when there is no fitting conflict, outputting a final reflected light intensity distribution. The dynamic suppression of the reflected light induced noise is realized under the condition of not depending on additional hardware components, and the system has the advantages of system flexibility and cost efficiency.

The application discloses a kind of based on light coupling partial discharge light signal integration and transmission method, it is related to signal integration and transmission technical field.The method comprises the following steps: constructing single-ended input-multichannel output optical fiber collection topology, collecting the fluorescence optical fiber output signal of each area;Signal merging is carried out to the multiple fluorescence optical fiber output signal, and a group of reference light source pulses is injected to each collection channel at fixed interval;Output signal intensity variation trend and channel self-calibration reference table, dynamically configure the gain parameter of photomultiplier preamplifier stage;After the electric signal that is converted by photoelectricity and preamplification adjustment is input high-speed analog-digital converter and sampling, and is carried out convolution fitting and time domain enhancement processing, according to the fluorescence optical fiber output signal of collection channel corresponding.This application has the advantages of high efficiency, error suppression ability, high detection sensitivity and so on, is suitable for the partial discharge monitoring and fault diagnosis under the complex structure in high-voltage switchgear and other power equipment.

Device topologies for monolithic electro-photonic integrated circuits comprising optical transmitters and receivers are disclosed, wherein each transmitter comprises a first electro-absorption modulator (EAM) waveguide and EAM driver electronics and each receiver comprises a waveguide photodiode, which may be a second EAM waveguide, and a transimpedance amplifier (TIA); and an optical input port for coupling an external laser to each of the transmitters, or an on-chip laser. Monolithic integration of photonics and electronics on a single chip with compact form factor provides reduced interconnect path lengths between the EAMs and the electronics compared to discrete electronics. Tx optical output ports and Rx optical input ports may be interleaved, or banked, along a first (beachfront) edge of the chip with a port-to-port spacing of ≤350 μm. The epitaxial layer structure may be fabricated from InP-based materials providing electronics layers comprising InP HBTs, and overlying photonics layers providing the first and second EAM waveguides.

An architecture for peripheral component interconnect express compliant signals over optical fiber is provided. A method includes, based on a first determination that an impedance level of a receiver device satisfies a defined impedance level, causing a driver to pulse at a first defined frequency and duty cycle level. Further, based on a second determination that a number of pulses received, at a transimpedance amplifier, at the first defined frequency and duty cycle level satisfy a defined number of pulses and at least one defined criterion, the method causes a second impedance level of the driver to match the defined impedance level and causes the driver to enter an electrical idle state. The method also includes facilitating, by a transmitter, transmission of data to the receiver device at a second defined frequency level, via an optical fiber link.

The invention discloses an optical interconnection device and method supporting an MIPI CSI-2 protocol D-PHY interface, and belongs to the technical field of high-speed serial communication. The device comprises a first D-PHY interface unit, a second D-PHY interface unit, a packaging / unpackaging mapping unit, a bidirectional communication link, a first I2C interface unit and a second I2C interface unit. A communication link adopts an optical fiber or a photoelectric composite cable, uplink data is subjected to electric-optical conversion and then is subjected to single-fiber / double-fiber transmission, downlink control signals are transmitted back through the optical fiber or the cable, and remote power supply is synchronously realized. The encapsulation mapping unit encapsulates the multi-channel video stream and the state information of the uplink communication link into a single-channel high-speed serial code stream, and the de-encapsulation mapping unit recovers the original protocol multi-channel video data stream and the state information of the uplink communication link; and selectable level adaptation units at the two ends of the link complete signal matching. According to the invention, the long-distance and low-error-code transmission of the camera of the D-PHY interface of the MIPI CSI-2 protocol is realized, the state of an interconnection link can be monitored in real time, the anti-EMI performance is strong, the cascade connection of multiple cameras can be supported, the weight of a wire harness is effectively reduced, the vehicle regulation environment requirements of-40 DEG C to + 125 DEG C are met, the problems of high bandwidth, long distance, multi-device interconnection and the like are solved, and the device is suitable for the scenes of vehicle-mounted ADAS, industrial vision and the like.

A computing chip, a laser radar, a controller, an optical communication system, and a vehicle. The computing chip comprises an electrical computing sub-chip and an optical computing sub-chip communicatively connected to the electrical computing sub-chip, wherein the optical computing sub-chip is used for receiving an optical signal carrying data to be computed, obtaining a computing result on the basis of the optical signal carrying said data, and outputting the computing result to the electrical computing sub-chip in the form of an electrical signal.