427results about "Star-type electromagnetic networks" patented technology

Hub node of a passive optical network, wherein the hub node includes a DSP (Digital Signal Processing) chain configured to: Receiving a signal burst from a leaf node in the passive optical network, wherein the signal burst comprises a frame including a payload and a frame header, the frame header comprising a clock and gain control section, a frame detection section and an equalizer section; Retrieving a clock phase of the leaf node from the clock-and-gain control section of the frame header; Estimation of the signal strength of a signal burst from the leaf node in the passive optical network; Compensation for differences in the signal power of the signal burst from the leaf node; Detecting a frame alignment sequence that indicates the arrival of the signal burst; Determination of MIMO (Multiple Input, Multiple Output) polarization filter coefficients from the frame alignment sequence; Aligning the phase between the X-polarization and Y-polarization of the signal burst using the MIMO polarization filter coefficients; and Determine the frequency offset estimate (FOE) of a local oscillator signal.

The invention provides a communication method, a communication device and a PON (Passive Optical Network) system, which can solve the problem of SN (Serial Number) conflict in a PON network and improve the system performance of the PON network. The method comprises: an OLT device receives a first SN from a first ONU device in a first time window, allocates a first ONU identifier to the first ONU device, and then broadcasts and sends first indication information and the first ONU identifier, the first indication information being used for indicating that the OLT device successfully allocates the first ONU identifier to the first ONU device. Thereafter, the OLT device receives a second SN from the second ONU device at a second time window, the second SN being the same as the first SN. And the OLT device determines whether to allocate a second ONU identifier to the second ONU device based on the authentication result of the first ONU device.

Systems and techniques for forward error correction decoding process power reduction are described herein. A first codeword is identified in a network transmission. A conditional decoding window starting with the first codeword is generated. The conditional decoding window is aligned with frames of the network transmission. A report is generated that includes an indication of a correlation of the conditional decoding window to the network device. The conditional decoding window and the report are sent to the network device. A conditional decoding window including a first codeword is received. The first codeword is decoded to determine a second codeword. A report is obtained that includes a codeword correlation bit for the second codeword. Upon determining that the codeword correlation bit indicates that the second codeword is not correlated, the second codeword is discarded without decoding the second codeword.

The invention provides an abnormal ONU detection method and system, electronic equipment and a computer readable storage medium. The detection method comprises the following steps: detecting a plurality of subcarrier wave bands; under the condition that the abnormal subcarrier wave band is detected, scheduling the ONU on the abnormal subcarrier wave band to a test detection wave band in the plurality of subcarrier wave bands; and judging whether the test detection wave band is abnormal or not, and determining an abnormal ONU in the abnormal subcarrier wave band according to a judgment result. Therefore, after the abnormal subcarrier wave band is detected, the ONU on the abnormal subcarrier wave band can be scheduled to other subcarrier wave bands (namely the test detection wave band) of the plurality of subcarrier wave bands by utilizing the characteristics of the plurality of subcarriers, and whether the scheduled ONU is abnormal or not is judged by judging whether the other subcarrier wave bands are abnormal or not. According to the invention, which ONUs in the abnormal subcarrier wave band are abnormal ONUs can be effectively detected, so that the abnormal ONUs can be effectively detected.

A fiber optic-based communications network includes: a power insertion device, connected to multiple fiber links from a data source, configured to provide power insertion to a hybrid fiber / power cable connected to at least one fiber link of the multiple fiber links; the hybrid fiber / power cable, connecting the power insertion device to a connection interface device, configured to transmit data and power from the power insertion device to the connection interface device; and the connection interface device, configured to provide an interface for connection to an end device via a power over Ethernet (POE)-compatible connection and to provide optical to electrical media conversion for data transmitted from the power insertion device to an end device via the hybrid fiber / power cable and the PoE-compatible connection.

An embodiment of the present disclosure provides a method for registering an optical network unit, which is used for an optical line terminal and includes: sending registration configuration information according to the registration information of the optical network unit to be registered obtained in advance to complete the registration of the optical network unit to be registered; wherein the registration information of the optical network unit to be registered is obtained before the start of this registration. An embodiment of the present disclosure also provides a method for writing registration information, an optical line terminal, an optical network unit, a preposed optical network unit, and a registration device.

This application provides a port detection method and apparatus. In the technical solutions in this application, an OLT or an ONU may determine, based on at least two wavelengths and a preset correspondence, port information that is of an optical splitter and that corresponds to the ONU. That is, a branch port directly or indirectly connected to the ONU is defined by using the at least two wavelengths. In this way, different branch ports can be distinguished by using combinations of a plurality of wavelengths, to define a large quantity of branch ports of the optical splitter by using free combinations of a small quantity of wavelengths.

A first coherent transceiver for a CPON includes a MAC layer for enabling dual-mode operation of the first coherent transceiver, a software management and control module for communicating with a second transceiver over an ODN communication channel, a coherent DSP in communication with the software management and control module and configured to process a digital signal from the MAC layer, and an optics infrastructure configured to transmit and receive analog data signals over the ODN to and from the second transceiver, respectively. The analog data signals include a communication subcarrier and a data subcarrier. The digital data signal includes a first data portion with control information from the communication subcarrier, and a second data portion with primary information from the data subcarrier. The coherent DSP further dynamically reconfigures digital data signal processing between first and second operational modes based on a transport type of the data channel subcarrier.

A fiber optic-based communications network includes: a power insertion device, connected to multiple fiber links from a data source, configured to provide power insertion to a hybrid fiber / power cable connected to at least one fiber link of the multiple fiber links; the hybrid fiber / power cable, connecting the power insertion device to a connection interface device, configured to transmit data and power from the power insertion device to the connection interface device; and the connection interface device, configured to provide an interface for connection to an end device via a power over Ethernet (PoE)-compatible connection and to provide optical to electrical media conversion for data transmitted from the power insertion device to an end device via the hybrid fiber / power cable and the PoE-compatible connection.

An aspect of the present invention is a station-side optical network unit to be connected to a subscriber-side optical network unit, the station-side optical network unit including: an acquisition unit that acquires, from the subscriber-side optical network unit, a signal-to-noise ratio of a received signal transmitted from the station-side optical network unit and received by the subscriber-side optical network unit; a deriving unit that derives a physical quantity indicating a quality of the received signal from the signal-to-noise ratio acquired by the acquisition unit; and a setting unit that sets a power of a signal transmitted by the station-side optical network unit to a minimum power among powers at which the physical quantity derived by the deriving unit indicates a predetermined quality.

Example embodiments describe an optical line terminal (OLT) configured to communicate in a point-to-multipoint optical network with optical network units (ONUs); where the OLT and a respective ONU share a set of shared keys. The OLT configured to perform receiving, from a respective ONU, at least one identifier encrypted according to a preconfigured encryption algorithm and a preconfigured key; wherein the at least one identifier is characteristic for the respective ONU. The OLT configured to perform decrypting the at least one received identifier according to the preconfigured encryption algorithm and the preconfigured key; and determining at least one shared key based on the at least one decrypted identifier.

Quantum networks having topologies defined by connected entanglement graphs which comprise plural vertices connected by plural edges are disclosed. The entanglement graphs are not all-to-all connected. The entanglement graphs may be non-planar graphs. At least some of the vertices are connected to three or more of the edges. Nodes of the quantum network correspond to vertices of the entanglement graph. Entanglement means are operable to directly entangle quantum systems in those pairs of the nodes which respectively correspond to vertices of the entanglement graph that are connected by an edge of the entanglement graph. Optical paths used by the entanglement means may include optical paths provided by braids or knots that are configured to interface to one or more units which include the nodes.

According to an aspect of an embodiment, an optical network unit (ONU) in a passive optical network (PON) may comprise a physical media dependent (PMD) receiver, a detector, and a processing device. The PMD receiver may be configured to receive a downstream signal from an optical line terminal (OLT). The detector may be configured to measure a link quality parameter in the downstream signal. The processing device may be configured to identify a link quality parameter target, wherein the link quality parameter target is a value that achieves a target error probability. The processing device may be configured to compute a link quality parameter margin between the measured link quality parameter and the link quality parameter target, and adjust a transmission parameter based on the link quality parameter margin.

A solution is provided for processing optical signals, wherein a mixing signal and a transmission carrier are both derived from a single light source, and wherein the mixing signal is located within a frequency band of a received signal and / or wherein the transmission carrier is located within the frequency band of the transmission signal.

In various embodiments, the present disclosure includes a system for sending 50 gigabits per second (Gbps), 75 Gbps, and 100 Gbps at 50 gigabaud (GBaud) for passive optical networks (PON) downstream and upstream. The system allows for transmission of three data rates at a single baud-rate while only using 2-bits of information per sample. A motivation for sending three data rates at a single baud-rate is to allow for further granularity in the control of the data-rates for downstream and upstream traffic in a flexible PON system based on the link margin. For example, the system can use non-return-to-zero (NRZ) at 50 GBaud for 50 Gbps and can use four-level pulse-amplitude modulation (PAM-4) at 50 GBaud for 100 Gbps. In addition for 75 Gbps, a double square-8 (DSQ-8) constellation can be used at 50 GBaud.

Optical data communication methods, corresponding orchestrator, system, access point equipment and computer program. The invention relates to a method for optical data communication between an OLT and a UE via an AP, comprising: - coordinating (50), via an orchestrator, the control plane of the optical data communication protocol and the control plane implemented between the AP and the UE, - optical data communication (51) between the OLT and the UE via the AP, taking into account the coordination of the control planes. Figure for abstract: figure 5

A system that supports geographically dispersed remote optical line terminals.

To provide an express path capable of reducing latency between an edge of a data center and leaf nodes.SOLUTION: An optical communication system includes a hub optical transceiver, a power splitter, and a plurality of spoke transceivers. The hub optical transceiver is configured for receiving a spectrum of wavelengths. The power splitter is coupled to the hub optical transceiver, and operates as a passive device that is configured to replicate the spectrum of wavelengths and output a plurality of replicated spectrum of wavelengths, and each replicated spectrum of wavelengths has a corresponding power that is a fraction of a total power received from the hub optical transceiver. The plurality of spoke transceivers is coupled to the power splitter and each of the plurality of spoke transceivers is configured to receive a corresponding one of the plurality of replicated spectrum of wavelengths.SELECTED DRAWING: Figure 4A

A network or system in which a hub or primary node may communicate with multiple leaf or secondary nodes. The hub node may operate at or have a capacity greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed that receive data carrying optical signals from the hub node and provide data carrying optical signals to the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include, for example, one or more spans or segments of optical fiber, optical amplifiers, optical splitters / combiners, and optical add / drop multiplexers. Optical subcarriers may be transmitted across such connections, each carrying a data stream. The subcarriers may be generated by a combination of lasers and modulators, eliminating the need for and reducing costs of multiple lasers and modulators. Furthermore, as the bandwidth or capacity requirements of the leaf nodes change, the number of subcarriers, and therefore the amount of data provided to each node, may change accordingly. Each subcarrier within a dedicated group of subcarriers may carry OAM or control information to a corresponding leaf node, and such information may be used by the leaf node to configure the leaf node to have a desired bandwidth or capacity.

The invention comprises distribution point unit (DPU) including a host for a GPON ONU / ONT module, CPU system-on-chip (SoC) providing a DPU and traffic management, a reverse power harvester and a high speed electrical (HSE) module and the DPU receiving optical signals via the GPON ONU / ONT module and converting to electrical signals and the HSE module transmitting electrical signals via a twisted pair or coaxial cable to a customer premises equipment (CPE) within a home or building and the reverse power harvester receiving power from the HSE module and the GPON ONU / ONT and HSE modules are pluggably mateable to the DPU.

A system including a passive optical network.

Methods, systems, and apparatus for identifying rogue Optical Network Unit (ONU) are disclosed. An Optical Line Terminal (OLT) detects error conditions on a passive optical network (PON) that includes optical networking units (ONUs) transmitting over the PON. The OLT disables and enables different sets of ONUs to identify a rogue ONU that is causing an error condition. The OLT classifies ONUs as a first set of suspect ONUs based on the error condition on another ONU being resolved when the suspect ONUs were disabled. The OLT classifies ONUs as a second set of suspect ONUs that causes the error condition to be present when the suspect ONUs are enabled. The OLT identifies the rogue ONU based on the rogue ONU being included in both of the first set of suspect ONUs and the second set of suspect ONUs.

This application provides a training sequence determining method and a related device. The method in embodiments of this application includes: An ONU receives a first message sent by an OLT. Then, the ONU determines a target training sequence based on the first message, where the target training sequence is used to determine a working parameter of an equalizer in the OLT. Further, the ONU generates a first data frame including the target training sequence. In this application, the OLT may perform training based on the received target training sequence to determine the working parameter of the equalizer in the OLT.

An optical fiber connector, an optical distribution network device, and an optical communication system, wherein the optical fiber connector includes a first ferrule, a second ferrule, a fiber grating, and a housing part. The fiber grating penetrates through the first ferrule and the second ferrule. The housing part is sleeved on the first ferrule and the second ferrule. The optical fiber connector optically interconnects to a network port on the optical distribution network device, and an optical signal uploaded from an optical network terminal is modulated by the optical fiber connector and then arrives at an optical line terminal.

This application provides an optical splitter, applied to the optical communication field. The optical splitter includes an optical splitting unit, a control unit, and a photoelectric composite unit. The optical splitting unit is configured to receive a downlink optical signal from a main gateway, and transmit N downlink optical sub-signals to the photoelectric composite unit. The control unit is configured to transmit N first electrical signals with different frequencies to the photoelectric composite unit. The photoelectric composite unit includes N ports. The N ports are configured to connect to N sub gateways through photoelectric composite cables respectively. The photoelectric composite unit is configured to output the N downlink optical sub-signals through the N ports respectively, and output the N first electrical signals with the different frequencies through the N ports respectively. In this application, operation and maintenance information may be transmitted to the sub gateway by using the first electrical signal, to improve network operation and maintenance efficiency.

To provide an optical path characteristic analysis device for measuring the loss distribution of an optical path, and to allow improvement in spatial resolution even in an optical path to be measured having a variation in the BFS.SOLUTION: The present disclosure is an optical path characteristic analysis device that acquires a plurality of measurement results of Brillouin scattering measuring a first area in which a specific point of an optical path to be measured is included and a second area in the first area excluding the specific point, and calculates the loss distribution at the specific point by using the plurality of measurement results of the Brillouin scattering.SELECTED DRAWING: Figure 1

A data transmission method and an apparatus are provided, to resolve a problem, in the conventional technology, that there is a high delay variation during data transmission. The method may be applied to an optical communication system, for example, a passive optical network PON system. The method includes: An optical line terminal OLT generates a data frame based on a frame structure; and sends the data frame to an optical network terminal ONT. One frame in the frame structure includes m subframes, one subframe includes n slices, a 1st slice in the n slices is a first slice, a slice other than the first slice in the n slices is a second slice, the first slice includes a first slot, the second slice includes at least one second slot, the second slot has a fixed location and size in the frame structure, m is a positive integer, and n is an integer greater than 1. Bandwidth isolation may be implemented by using the slice included in the subframe, and the second slot with a fixed location and size may be reserved for service data of a high-priority service. A delay variation during data transmission of the high-priority service may be reduced by using the second slot with a fixed location and size.

A system is provided for wavelength control in a passive optical network (PON) with point to multi-point (P2MP) topology. The system comprises a central node and a plurality of end nodes. The system comprises a central node transceiver configured for broadcasting to end nodes a reference signal carrying a management information, wherein the management information indicates a target frequency assigned to each end node, and an end node transceiver in each end node. The end node transceiver in each end node is configured for determining the target frequency by extracting the management information from the reference signal, generating a beating frequency by beating the reference signal with an uplink laser signal, and controlling a wavelength of the uplink laser signal to lock to the target frequency based on the beating frequency.