Optical network systems are disclosed, including a system comprising a transmitter including a digital signal processor operable to receive a plurality of independent data streams and output a plurality of digital signals based on the plurality of independent data streams, digital-to-analog circuitry operable to supply a plurality of analog signals based on the plurality of digital signals, a laser operable to supply an optical signal, a modulator operable to receive the optical signal and supply a modulated optical signal based on the plurality of analog signals, including a plurality of optical subcarriers, each of which being associated with a corresponding one of the plurality of independent data streams, a first one of the plurality of optical subcarriers having a first spectral width and a second one of the plurality of optical subcarriers having a second spectral width different than the first spectral width; and a first and a second receiver.

Disclosed is a device communicably coupled to a power transmission line and capable of launching transverse electromagnetic waves onto the transmission line. The waves propagate data received from a data source connected to the device through a center conductor surrounded by a shield conductor. The device may include a reflector and a coupler adjacent to each other, the reflector electrically connected to the shield conductor and the coupler electrically connected to the center conductor at an unshielded connection point, wherein time-varying E-fields between the reflector and coupler are caused by the data received from the data source, and induce a transverse magnetic wave that propagates longitudinally along the surface of the transmission line.

A vehicle communication system includes an optical cable, a centralized hub device, and an antenna hub device. The centralized hub device is connected to a first end of the optical cable and is configured to receive radio frequency (RF) signals from multiple end devices. The centralized hub device is configured to convert the RF signals to respective optical carrier signals and transmit the optical carrier signals along the optical cable at different, non-overlapping wavelength bands of a combined optical signal. The antenna hub device is connected to a second end of the optical cable. The antenna hub device is configured to receive the combined optical signal and to convert the optical carrier signals thereof to RF signals, amplify the RF signals, and transmit the RF signals to one or more antennas.

An optically powered Global Navigation Satellite System (GNSS) antenna may use a fiber-optic link to receive optical power and transmit an optical signal that contains a common time signal from one or more satellites, which may allow long-distance power and signal transmission with high efficiency and reliability. The common time signal may be used to synchronize intelligent electronic devices (IEDs) of an electric power delivery system.

Distributed antenna systems provide location information for client devices communicating with remote antenna units. The location information can be used to determine the location of the client devices relative to the remote antenna unit(s) with which the client devices are communicating. A location processing unit (LPU) includes a control system configured to receive uplink radio frequency (RF) signals communicated by client devices and determines the signal strengths of the uplink RF signals. The control system also determines which antenna unit is receiving uplink RF signals from the device having the greatest signal strength.

A network capable of 1:n communication in an optical wireless mesh network is provided. An optical wireless communication network communication system A1 comprises an optical wireless communication network communication system A1 comprising: an optical transmitter Ti and an optical receiver Ri, and an optical fiber cable or a coaxial cable for transmitting a signal received by the optical receiver Ri to the optical transmitter Ti at each node, wherein the n+1 node Ni is connected by a network, the optical wireless communication transceiver Si at each node Ni is capable of transmitting simultaneously to all the optical wireless communication transceivers Sj of the other n nodes Nj when its own node Ni and all of the other n nodes Nj satisfy a predetermined condition, and can be received simultaneously from all the optical wireless communication transceivers Sj of the other n nodes Nj.

Provided are: a photon detection light-receiving device with which it is possible to avoid malfunctions caused by the application of high voltages, and to shorten the delays in communication time in mesh-type network communication; and a communication apparatus equipped with the photon detection light-receiving device. The photon detection light-receiving device has a photon detection APD, a quenching resistor and a capacitor, with one end of the quenching resistor and one end of the capacitor being connected to one terminal of the photon detection APD. The optical wireless communication apparatus comprises: a housing; a photon detection light-receiving device that generates an electrical signal from received light; a receiving unit that generates a reception data signal using an electrical signal from the photon detection light-receiving device; a transmission unit that generates an electrical signal using a transmission data signal; a light emitting device into which the electrical signal from the transmission unit is input and generates transmission light; and an optical wireless communication controller that generates transmission data or reception data corresponding to the protocol of an external apparatus.

Methods and systems capable of launching signal-carrying transverse electromagnetic waves onto a transmission line in the higher voltage region of the transmission distribution network. Such methods and systems may include a surface wave launcher located in the higher voltage region, a network unit located in a lower voltage region, and an arrester separating the surface wave launcher and the network unit, the arrester preventing voltage from arcing over from the higher voltage region to the lower voltage region where the arrester provides the signal to the surface wave launcher.

Adaptive scheduling for periodic data traffic in an optical communications network for a wireless communications system (WCS) is disclosed. Herein, an optical line terminator (OLT) in an optical communications network is configured to dynamically adjust a scheduled start time(s) of a scheduled period(s) in a periodic schedule to help reduce a schedule misalignment to below a predefined threshold. More specifically, the OLT is configured to determine the schedule misalignment. Accordingly, the OLT can adjust the respective scheduled start time(s) of the scheduled period(s) based on a temporal step determined based on the determined schedule misalignment to reduce the schedule misalignment to below the predefined threshold. By adapting the periodic schedule based on the determined schedule misalignment, it is possible to reduce scheduling delays for communicating the periodic data traffic, thus making it possible for the optical communications network to support a time-critical application for improved user experience.

Methods and apparatus for reducing and/or canceling signal interference between receiver and transmitter components of a wireless communications device are described. The methods and apparatus are well-suited for use in a wide range of devices including user equipment devices such as cell phones as well as in network equipment such as base stations. Opto-mechanical devices are used in some embodiments as part of an apparatus which performs interference cancelation on RF (Radio Frequency) signals.