45 results about "Optical network unit" patented technology

The application provides a window drift processing method and an optical line terminal, an optical network unit and a computer readable storage medium. The window drift processing method applied to the OLT comprises the following steps: in the case that a first burst signal corresponding to an ONU is received, first information is determined according to the first burst signal, the first information is used for representing a window drift condition of the first burst signal; a drift domain is constructed according to the first information and the first burst signal; a GTC frame is transmitted to the ONU, so that the ONU corrects the window drift condition of the first burst signal according to the GTC frame, and the GTC frame is filled with the drift domain. In the embodiment of the application, the deviation can be quickly and accurately corrected directly according to the GTC frame, so that the efficiency of correcting the window drift of the burst signal is improved, and the stability of the passive optical fiber network is improved.

A scheduling method, an OLT, an ONU, a system, a storage medium, a vehicle, and a program product. The method can be applied to an optical communication system. The optical communication system comprises an optical line terminal (OLT) and at least one optical network unit (ONU), wherein the at least one optical network unit (ONU) comprises a first ONU; the OLT can determine, on the basis of feature information of a deterministic service, a configuration parameter of a transmission window of a first packet of the deterministic service; and the OLT can also send scheduling information to the first ONU, the scheduling information indicating the transmission of the configuration parameter of the transmission window.

A coherent transmitter (100, 200) for use in a time division multiple access (TDMA) system is operated in multiple states to enable coherent burst transmission. In an OFF state, the transmitter (100, 200) generates a dummy laser output (fd) from either a dummy laser (102) or an active laser (52) tuned to a dummy frequency different from an active frequency (fa), thereby maintaining thermal and bias stability without adding excess power on an upstream channel (22). In an ON state, the active laser (52) produces an active laser output (fa) that is modulated by a quad-parallel Mach-Zehnder (QPMZ) modulator (60) to transmit data. A thermoelectric cooler (TEC) (58) stabilizes laser temperatures, and a variable optical attenuator (VOA) (54) controls output power. The transmitter (100, 200) is suitable for an optical network unit (ONU) (14) in a passive optical network (PON) (10) communicating with an optical line terminal (OLT) (12).

A roaming method and apparatus, relating to the field of communication technology, are provided for providing a processing flow for master-slave optical network units. The method includes: a master optical network unit (MFU) sending a roaming preprocessing message to a target SFU, the roaming preprocessing message instructing the target SFU to initiate roaming preparation for the site; and the MFU receiving a roaming preprocessing feedback message from the target SFU, the roaming preprocessing feedback message indicating whether the roaming preparation for the site was successful.

This invention relates to the field of optical networks, and more particularly to a service activation method, network element management device, and storage medium. The service activation method includes: upon receiving a service activation request from an optical line terminal (OLT), determining pre-configured initial service information corresponding to the service activation request; if the location information contained in the initial service information differs from the location information contained in the service activation request, updating the location information of the initial service information to obtain target service information; and sending the target service information to the OLT, which then activates the service for the optical network unit (ONU) according to the target service information. By automatically updating the location information of the initial service information when it is determined that it differs from the location information contained in the service activation request, manual checks are avoided, improving the efficiency and success rate of service activation for ONUs.

A method and system for optimizing ODN attenuation based on multi-parameter matching, relating to the field of electronic digital data processing, is disclosed. The method includes: reading multiple candidate topology schemes of the ODN network to be planned, generating a multi-dimensional parameter vector set, and performing similarity matching calculations with the parameter vectors of completed networks in a historical engineering database to determine a reference ODN network identifier; extracting real received optical power telemetry data based on the reference ODN network identifier to generate a real optical power dataset; reading original design data, calculating the theoretical estimated optical power of each optical network unit according to a preset standard attenuation linear formula to generate a theoretical optical power dataset; determining multi-parameter joint compensation coefficients, performing basic attenuation calculations on multiple candidate topology schemes based on the standard attenuation linear formula, and calculating corrected attenuation values; and determining the candidate topology scheme as the attenuation optimization scheme for the ODN network to be planned. Implementing this application can improve the accuracy of scheme optimization for actual optical distribution networks.

A method of operating a coherent transmitter in a time division multiple access (TDMA) system includes operating in an OFF state while the coherent transmitter is not assigned to transmit data in the TDMA system, wherein operating in the OFF state comprises generating a laser output having a dummy frequency different from an active frequency used to transmit data in the TDMA system; and operating in an ON state while the coherent transmitter is assigned to transmit data in the TDMA system, wherein operating in the ON state comprises generating an active laser output having the active frequency and modulating the active laser output using a modulator. Advantageously, the coherent transmitter can be used at an optical network unit (ONU) in a coherent passive optical network (CPON).

The application discloses a PON distributed intelligent computing task scheduling method and belongs to the technical field of optical access network communication technology. The application obtains the link attenuation coefficients of each optical network unit through an optical line terminal and broadcasts; the allocation information of a differential double-wavelength channel and a gradient vector is established and broadcasted; a differential double-wavelength mapping is used to allocate target optical power to gradient components, and each unit is instructed to transmit after compensation in combination with the attenuation coefficients; optical signals are received on the differential double-wavelength channel and are converted into photoelectric current, and a global gradient vector is constructed after dark current is eliminated; the maximum value of the net photoelectric current difference value is counted to adaptively update the mapping coefficients and broadcast, and the global model parameters are updated and issued to each unit to complete synchronization. The application solves the problems of communication bottlenecks in the existing gradient aggregation and a large dynamic range of optical signal power.

Apparatus and methods for discovery, synchronization and operation of network components. In one embodiment, the network comprises a passive optical network (PON), and the components being synchronized include an enhanced OLT (eOLT) and one or more enhanced ONUs (eONUs). The eOLT is configured in one variant to utilize control protocol messaging (such as those used in the MPCP or Multi Point Control Protocol) to communicate particular synchronization parameters and durations to the eONU(s), whether individually or via multicast / broadcast. The synchronization parameter and durations are selected to optimize discovery and synchronization of the eONU(s) with the eOLT, and also optimize (subsequent) normal operation, in one implementation through selection of synchronization patterns which enable most efficient AGC determination, clock recovery (CDR), SBD, and EBD identification.

This application relates to an optical network communication method, system, related apparatus, and vehicle, and pertains to the field of coherent optical communication technology. The method is applied to the transmitting end of a first node in an optical network communication system. The method includes: modulating data to be transmitted into multiple subcarrier signals; filtering the multiple subcarrier signals using multiple filters to obtain multiple filtered subcarrier signals, wherein the amplitude and phase of the multiple filtered subcarrier signals are different; generating corresponding optical signals based on the multiple filtered subcarrier signals; and sending the optical signals to the receiving end of a second node in the optical network communication system. This method achieves efficient modulation and transmission of uplink signals through carrierless amplitude-phase modulation technology, while also helping to simplify the number of components in an optical network unit.

In some implementations, the techniques described herein relate to a method including: receiving, at an optical line terminal (OLT), a registration request from an optical network unit (ONU); computing an activation fingerprint based on timing values captured during activation of the ONU; receiving an activation digest computed using the activation fingerprint and a privately maintained digest key; storing the activation digest; receiving, during a subsequent activation attempt, the digest key used to compute the stored activation digest; and determining whether the ONU is authorized by comparing the stored activation digest with a verification digest computed using the stored activation fingerprint and the received digest key.

The utility model relates to a compact module type optical branching filter, include: box body, box cover, with box body forms accommodating cavity, accommodating cavity is used for accommodating optical device, spring screw, it sets up in one of four lateral walls of box body, LC adapter, it is installed on the box body lateral wall of spring screw place, the input port of optical device passes through LC adapter and is connected with outside, is equipped with a plurality of first optical output port on the box body, and the output port of optical device is connected equipment through a plurality of first optical output port and forms the output of optical signal, the compact module type optical branching filter of the utility model adopts full metal shell design, satisfies the installation in cabinet, is applicable to the connection between industrial optical line terminal (OLT) and terminal user nearby optical network unit (ONU), can satisfy the connection of high density optical fiber network, simple structure, and the installation mode is simple and convenient to operate, can reduce construction and engineering maintenance cost.

The application provides a slice division method and system based on a passive optical network architecture, the method comprising: performing global slice division on a network undirected graph based on a traffic matrix of the network undirected graph to obtain a plurality of subgraphs, wherein the network undirected graph comprises nodes and edges connecting the nodes, the nodes represent optical network units, the edges and weights of the edges represent communication relationships and traffic between the optical network units respectively, the subgraphs and the number of optical line terminals are the same, and the traffic matrix comprises traffic between the optical network units; performing local search optimization on each subgraph based on weights of edges connecting each node in the subgraph to obtain a target subgraph with minimized cut value, so as to output a plurality of target slices, wherein the cut value is obtained based on the weights of the edges connecting each node in the corresponding subgraph, and the target slice comprises the optical line terminal and a plurality of optical network units in the corresponding subgraph connected by the target subgraph. The application can improve the traffic diversion efficiency of the access network.

A smart park system with hybrid networks based on 5G / 5G-A and IoT technologies is disclosed. The smart park system comprise: terminal device; a cloud network system, which include a 5G network and an all optical network; an IoT platform; an application platform; and an application service sub-system. The all optical network includes a core network switch, an optical line terminal OLT and an optical network unit ONU, wherein the OLT adopts a reverse feedback priority dynamic setting, in which the OLT sends a first data package via a first downlink channel, the OLT dynamically sets a priority of the first downlink channel from the OLT to the ONU according to a feedback for the first data package via a corresponding first uplink channel, and the OLT sends subsequent first data packages via the first downlink channel according to the set priority.

An optical modulation and amplification apparatus, an optical module, an optical network unit, and an optical communication system are provided. The optical modulation and amplification apparatus includes an electric absorption modulator and a semiconductor optical amplifier. The electric absorption modulator and the semiconductor optical amplifier share a same substrate and a same multi-layer material structure. The multi-layer material structure includes, from bottom to top, at least a first quantum well, an electron blocking layer, a second quantum well, and an upper separate confinement layer. The electric absorption modulator is configured to modulate injection light by using the first quantum well, and the semiconductor optical amplifier is configured to amplify the injection light by using the second quantum well.

Embodiments of the present application provide a data transmission method and device, a storage medium and an electronic device, wherein the method comprises: an optical line terminal (OLT) sending synchronization information to an optical network unit (ONU), for the ONU to set a function of synchronizing with the ONU based on the synchronization information; and the OLT encapsulating target management information into a target frame, and sending the target frame to the ONU on a time slot allowing sending the target frame. Through the present application, the problem of needing to develop independent products and components for different passive optical networks in the related art, thereby leading to a higher development cost and a more complex operation, is solved, and the effect of reducing the development cost and the operation complexity is achieved.

The application discloses a kind of based on digital subcarrier multiplexing multi-passive optical network system and its dynamic bandwidth allocation method, the scheme is divided into multiple independent adjustable subcarrier channels by digital subcarrier multiplexing technology on electric domain, and the number of subcarriers is dynamically adjusted and distributed to each PON, so as to realize the differentiated bandwidth allocation between different PONs, satisfy the bandwidth demand between multi-PON changes with region and time.The steps of dynamic bandwidth allocation method are: step S1: predict bandwidth demand, calculate demand satisfaction rate and determine priority for each ONU (Optical Network Unit) in multi-PON;Step S2: count the bandwidth demand of different priority of each PON;Step S3: calculate and dynamically allocate a certain number of subcarriers for each PON;Step S4: dynamically allocate bandwidth to each ONU in PON according to priority;Step S5: activate / close neighbor subcarrier;Step S6: global subcarrier reconfiguration is carried out.

Embodiments of the present application provide a pre-equalization information transmission method, an electronic device and a storage medium, and the method comprises: determining equalizer information according to first information transmitted by a second node and a target equalization sequence; and transmitting the equalizer information to the second node based on a registration activation process of an optical network unit. According to the embodiments of the present application, pre-equalization information is transmitted in a passive optical network, so that the inter-symbol interference of the system is reduced, and the communication quality of the system is improved.

The application relates to a roaming method and device, and relates to the technical field of communication, which is used for providing a processing flow of master-slave optical network units. The method comprises the following steps: in a roaming process of a site, a master optical network unit (MFU) sends a service closing indication message to a source optical network unit (SFU), the service closing message is used for indicating the SFU to close service interaction with the site; and the MFU receives a service closing feedback message from the SFU, the service closing feedback message is used for indicating whether the service interaction with the site is successfully closed.

A method for controlling an optical module by a board in an optical line terminal (OLT) includes obtaining by, during upstream slot allocation, information such as an identifier of a target optical network unit (ONU) and a target operating rate of the target ONU; sending, by the board, the information to an optical module through a target interface; and determining, by the optical module, an operating parameter based on the information carried in a target message, including determining operating parameters of an equalizer, an amplifier, a filter, and a laser.

A time synchronization method for a passive optical network and an electronic device and storage medium. The method applied to an OLT comprises: acquiring a first response time from a first ONU (S1100); performing a distance measurement calculation on the first ONU to obtain a first equalization delay (S1200); generating an equalization delay configuration message according to the first response time and the first equalization delay (S1300); and sending the equalization delay configuration message to a second ONU to configure a second equalization delay of the second ONU (S1400), wherein the first and second ONUs are ONUs connected to the same optical fiber branch.

The application relates to a method and device for setting a silence window, equipment, a storage medium and a program product. The method comprises the following steps: stopping opening a silence window for a passive optical network (PON) channel of an optical line terminal (OLT) when the PON channel meets a window closing condition; wherein the silence window is used for realizing online activation of an optical network unit (ONU). It can be seen that, compared with the prior art, the application can greatly reduce the number of silence windows by stopping opening the silence window for the PON channel when the OLT detects that the PON channel meets the window closing condition, so that the data transmission delay and data transmission jitter of the normal ONU can be reduced, and the uplink transmission quality of the ONU can be improved.

Embodiments of the present application provide a bandwidth authorization method, device and system, storage medium and electronic device, wherein the method comprises: obtaining data sending information of multiple data sent by an optical network unit (ONU); determining target data from the multiple data based on time information of each data; analyzing the target data to determine a data packet length, a target sending time and a target sending period of the target data; sending a target bandwidth time matching the data packet length, the target sending time and the target sending period to the ONU to instruct the ONU to send subsequent target data according to the target bandwidth time. Through the present application, the problem of system bandwidth waste caused by eliminating the time delay and jitter of data sending in the related art is solved.

An optical line terminal (OLT) is disclosed. The OLT includes at least one processor and at least one memory including machine-readable instructions. The at least one memory and the machine-readable instructions are configured, together with the at least one processor, to cause the OLT to determine, based on one or more variables, a relationship between the bandwidth efficiency and latency of communication between the contents of a queue buffer of an optical network unit and the OLT via an optical distribution network, and to determine burst scheduling for the queue buffer based on the determined relationship.

This invention provides an energy-saving configuration method, apparatus, and storage medium for passive optical networks (PONs). The method includes: an optical line terminal (OLT) sending an energy-saving control message or message group to an optical network unit (ONU), wherein the energy-saving control message or message group includes a first operating parameter and a second operating parameter for the channel pair (CP) between the OLT and the ONU; and the OLT configuring itself according to the first operating parameter or the second operating parameter. This invention solves the problem of how to flexibly adjust the operating state in a passive optical network, enabling flexible configuration and adjustment of operating parameters and reducing the complexity of energy-saving optimization in PONs.

The application provides a message forwarding method and device, equipment and a storage medium. The method receives a message sent by a first device, the message encapsulates a destination MAC address and a source MAC address, and the message is a Profinet RT message. Based on the containing relationship between a MAC address set recorded by an optical network unit and the destination MAC address, a target optical network unit corresponding to the destination MAC address is determined from a plurality of optical network units in communication connection with an optical line terminal. The message is forwarded to the target optical network unit, so that the target optical network unit sends the message to a second device according to the destination MAC address. Since the destination MAC address and the source MAC address are additionally encapsulated in the Profinet RT message, and the message is forwarded according to the destination MAC address instead of a VLAN identifier, the success rate of message forwarding can be improved in a passive optical network system lacking a switch.

The application discloses a kind of vehicle-mounted optical communication link fault detection system, method and vehicle, it is related to vehicle technical field.System includes: optical network unit;Passive optical brancher is connected with optical network unit, constitutes sublink, fiber array is etched with different center wavelength fiber Bragg grating, with each sublink one-to-one correspondence;First light splitter is connected with the optical network unit connected with passive optical brancher;Optical switch is connected with first light splitter;Fault diagnosis module is used to control optical switch full pass, obtain the optical time domain reflection trace of whole link, control optical switch each first light splitter is selected in turn, different identification wavelength probe light signal is sent to each sublink in turn, the reflection signal of fiber Bragg grating is received, to determine fault sublink, according to optical time domain reflection trace determines breakpoint position, generates detection result.

The present application relates to the technical field of wavelength division multiplexing passive optical network transmission optimization, in particular to a wavelength division multiplexing passive optical network transmission optimization method and system. The method comprises the following steps: S1, constructing a network architecture by a plurality of pairs of wavelength stacking optical modules, dividing an optical network unit in the network architecture, and receiving and transmitting optical signals of a terminal by the optical network unit; through the dense wavelength division multiplexing and the ONU architecture design of separating transmission and reception, the wavelength resource pool capacity is further expanded, combined with the flexible branch ratio of 1:8 to 1:256 and the single-mode and multi-mode optical fiber compatible capability, the system can stably support 100Gb / s total rate transmission in different scales and different transmission distance scenes, and the problem of low wavelength resource utilization rate in the traditional static allocation mode is completely solved.