Abstract: A method for connecting a wireless communication station (STA) with a selected one of a plurality of access points (APs) are described. At least some of the APs are initially substantially unsynchronized in time. The method includes transmitting, by the STA, a beacon request signal via an uplink channel, performing, by the APs and in response to the beacon request signal, a synchronization procedure, the synchronization procedure comprising transmitting, by each of the APs, a respective beacon signal via at least one downlink channel, such that the beacon signals from the plurality of APs are substantially synchronized in time, receiving, by the STA, the beacon signals from the plurality of APs, selecting, by the STA, one of the plurality of APs in dependence on at least one property of the beacon signals, and associating the STA with the selected one of plurality of APs. Related systems and devices are described.

Abstract: Provided is a polarization multiplexing optical transmitting and receiving circuit that compensates for transmission side PDL so as to suppress a reduction in transmission power and makes a branching ratio of light from a light source variable between a transmission side and a receiving side according to a system to be used.

Abstract: A system includes a first unit configured to generate a plurality of modulator control signals, and a processor unit. The processor unit includes: a light source or port configured to provide a plurality of light outputs, and a first set of optical modulators coupled to the light source or port and the first unit. The optical modulators in the first set are configured to generate an optical input vector by modulating the plurality of light outputs provided by the light source or port based on digital input values corresponding to a first set of modulator control signals in the plurality of modulator control signals, the optical input vector comprising a plurality of optical signals. The processor unit also includes a matrix multiplication unit that includes a second set of optical modulators.

Abstract: A method for transmitting time information and quantum states on an optical medium is disclosed. The method includes transmitting information comprising a timing information and quantum states over a single wavelength on an optical medium. The method also includes receiving each transmitted information sequentially in the corresponding plurality of time slots at a receiver. The method also includes comparing each timing information received in the corresponding plurality of timeslots with timing information of a preceding hold over time slot of the plurality of time slots. The method also includes determining a time drift encountered at the receiver based on a compared result. The method also includes synchronising phase and frequency of the plurality of transmitted packets of the information based on minimization of determined time drift.

Abstract: The present disclosure provides an optical communication drive circuit and method, an optical communication transmitter, an optical communication system, and a vehicle. The optical communication drive circuit includes a clock circuit and a modulation circuit. The clock circuit is configured to output a clock signal with an initial frequency signal as an input under control of information to be transmitted. The clock signal includes alternating first and second frequency signals, the first frequency signal and the second frequency signal having different frequencies and being generated based on the initial frequency signal; and the modulation circuit is configured to modulate an optical signal by the clock signal to obtain a modulated optical signal.

Abstract: A transmission network system, data switching and transmission method, apparatus and equipment are provided. The transmission network system includes: a flexible Ethernet group located at a physical layer; at least one flexible Ethernet client carried over the flexible Ethernet group; a flexible Ethernet time slot control module, configured to map, according to a block sequence, service data coming from an upper layer onto the flexible Ethernet group, and recover, from a block sequence received by the flexible Ethernet group, corresponding service data; a flexible Ethernet switching module, configured to perform switching in a physical layer and transmission of service data according to the block sequence.

Abstract: Methods and apparatus for interference cancelation in a radio frequency communications device are described. In various embodiments a signal to be transmitted in converted into an optical signal and processed using an optical filter assembly including one or more optical filters to generate an optical interference cancelation signal. The optical interference cancelation signal is converted into an analog radio frequency interference cancelation signal using an optical to electrical converter prior to the analog radio frequency interference cancelation signal being combined with a received signal to cancel interference, e.g., self interference. The optical filter assembly can include a large number of taps, e.g., 30, 50, 100 or more. Each tap may be implemented as a separate optical filter or series of optical filters. Delays and/or gain of the optical filters can be controlled dynamically based on channel estimates which may change due to changes in the environment and/or communications device position.

Abstract: Disclosed are apparatuses and testing methods for emulating an Optical Network Terminal (ONT) device for communicating or otherwise working with an Optical Line Terminal (OLT) device that was configured to operate with the ONT device. Such emulation may include configuring various settings of the apparatus so that the apparatus may appear to the OLT to be the ONT device. For example, the emulation may include accessing and using authentication/authorization related settings and network configuration settings of the ONT, thus permitting the apparatus to connect to a Passive Optical Network and test services and the quality of service experience without having to reconfigure the OLT.

Abstract: Example embodiments of this application provide a method and an apparatus for transmitting a service flow based on FlexE. The method includes: sending, by a first network device, a first FlexE overhead frame to a second network device, where the first network device and the second network device transmit a service flow using a first FlexE group, and the first FlexE overhead frame includes FlexE group adjustment identification information and PHY information of a physical layer (PHY) included in a second FlexE group; receiving, by the first network device, a second FlexE overhead frame sent by the second network device, where the second FlexE overhead frame includes FlexE group adjustment acknowledgment identification information; adjusting, by the first network device, the first FlexE group to the second FlexE group; and sending, by the first network device, the service flow to the second network device based on the second FlexE group, to dynamically adjust a FlexE group.

Abstract: Systems and methods for predicting performance of a modulation system are provided. A neural network model is trained using performance information of a source system. The neural network model is modified with transferable knowledge about a target system to be evaluated. The neural network model is tuned using specific characteristics of the target system to create a source-based target model. The target system performance is evaluated using the source-based target model to predict system performance of the target system.

Abstract: A satellite signal relay system according to an embodiment of the inventive concept includes: a plurality of remote units configured to receive an analog satellite signal, to convert the analog satellite signal into a digital satellite signal, to generate a characteristic signal for the analog satellite signal, to generate a transmission frame based on the digital satellite signal and the characteristic signal, and to convert the transmission frame into an optical transmission frame; and a central unit configured to convert optical transmission frames received from the plurality of remote units into transmission frames through an optical transmission medium, respectively, to extract a digital satellite signal and a characteristic signal from each of the converted transmission frames, and to convert any one of the extracted digital satellite signals into an analog satellite signal based on the extracted characteristics signals.

Abstract: An apparatus and system, including a switch; and a set of tiles; wherein each of the set of tiles include a PIC die, a DSP die, a driver die, and a TIA die and methods thereto.

Abstract: A data-receiving circuit adapted to an electronic device is provided herein. The electronic device receives a power-saving signal to operate in a power-saving mode. The data-receiving circuit includes a first register, a second register, a decoder, a data register, and a control circuit. The first register is configured to store a target value. The second register is configured to store the length of the target value. The decoder captures control data and endpoint data from an IR signal. The data register is configured to store the control data. The control circuit empties out the data register according to the power-saving signal and the endpoint signal.

Abstract: A path computation engine, PCE, (100) for an optical communications network comprising a plurality of nodes and a plurality of links.

Abstract: An optical communication system includes a transmitter and at least one receiver employing a feature of an outdoor environment, or includes a transmitter and a receiver in each of multiple transceivers employing a respective or shared feature of the outdoor environment. The transmitter includes a laser emitting a beam of laser pulses having a wavelength. The transmitter encodes data into the laser pulses in the beam, and transmits the beam of laser pulses through free space of the outdoor environment and then onto a feature of the outdoor environment. Each receiver includes a line filter blocking light not having the wavelength. The receiver decodes data from the light that passes through the line filter and includes a diffusion of the beam from the feature.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for clock synchronizing an optical system and multiple leaf systems. In some implementations, a method includes: first data is received from an optical system. The first data is detected using a local oscillator signal provided by a local oscillator laser. The first data is processed using a first sampling rate. A frequency of a clock signal supplied by a reference clock is adjusted based on the processed first data. Second data is transmitted to the optical system at a rate based on the clock signal.

Abstract: Communications systems and methods of controlling the same include generating and processing a constant envelope phase-modulated optical signal, the systems including an optical source configured to provide a carrier waveform, an encoding module configured to encode the data as a plurality of symbol sequences, a mapping module configured to convert the plurality of symbol sequences to a plurality of phase state changes and a plurality of directions according to a path-dependent phase modulation scheme, and a phase modulator configured to modulate the carrier waveform with the plurality of phase state changes and directions to generate the constant envelope phase-modulated optical signal.

Abstract: Modules for optical time-domain reflectometry (OTDR) are connected via at least one fiber link of a fiber optic communication network. The modules can perform OTDR operations on the at least one fiber link. In addition, the modules can establish an inter-node communication channel between each other on the at least one fiber link. The channel allows the OTDR modules to synchronize their OTDR operations and to exchange information, such as OTDR traces, between each other.

Abstract: Embodiments of this application provide a method and an apparatus for obtaining optical distribution network (ODN) logical topology information, a device, and a storage medium. The method includes: obtaining identification information of each first ONU that is connected to a first passive optical network (PON) port and whose optical path changes and feature data of the first ONU in a first time window, where the feature data includes receive optical power and/or an alarm event; obtaining, based on the feature data of each first ONU, a feature vector corresponding to each first ONU; and performing cluster analysis on the feature vector corresponding to each first ONU, to obtain topology information corresponding to the first PON port. ONU topology information is obtained by analyzing an ONU feature.

Abstract: A digital receiver is configured to process a polarization multiplexed carrier from a communication network. The polarization multiplexed carrier includes a first polarization and a second polarization. The receiver includes a first lane for transporting a first input signal of the first polarization, a second lane for transporting a second input signal of the second polarization, a dynamic phase noise estimation unit disposed within the first lane and configured to determine a phase noise estimate of the first input signal, a first carrier phase recovery portion configured to remove carrier phase noise from the first polarization based on a combination of the first input signal and a function of the determined phase noise estimate, and a second carrier phase recovery portion configured to remove carrier phase noise from the second polarization based on a combination of the second input signal and the function of the determined phase noise estimate.