Abstract: A communication device includes a transmitter configured to generate a data signal, and a controller configured to stop an operation of the transmitter in response to an optical transmission stop instruction. The optical transmission stop instruction preferably has a predetermined bit pattern.

Abstract: A visible light communication sensor and visible light communication method are provided. The visible light communication sensor includes a comparator, a sensing unit, and a first ramp signal generator. The comparator includes a first input terminal, a second input terminal, and an output terminal. The sensing unit is coupled to the first input terminal of the comparator. The sensing unit is configured to sense a visible light communication signal to output a sensing signal to the first input terminal of the comparator. The first ramp signal generator is coupled to the second input terminal of the comparator and is configured to output the first ramp signal to the second input terminal of the comparator. The comparator outputs a comparison result signal via the output terminal according to the voltage values of the first input terminal and the second input terminal.

Abstract: A system comprises a digital predistortion circuit comprising: a first quantity of delay circuits configured to delay a signal to be predistorted; a second quantity of filter tap circuits, wherein the second quantity is smaller than the first quantity; and a delay-to-filter-taps mapping circuit that is operable to map each output of a first subset of the delay circuits to a corresponding input of the filter tap circuits. The system may comprise circuitry operable to select which of the first quantity of delay circuits is in the first subset. The selection of which of the first quantity of delay circuits is in the first subset may be based on a temperature measurement. The digital predistortion circuit may comprise cross-term generation circuitry operable to generate cross-term signals corresponding to the cross products of multiple, differently-delayed versions of a signal input to the digital predistortion circuit.

Abstract: In-band full-duplex (IBFD) wireless systems offer the ability to revolutionize frequency spectrum utilization for future networks. For IBFD systems to work, the self-interference (SI) generated by each wireless node should be sufficiently mitigated, which becomes more challenging as the bandwidth increases. RF cancellation enables this interference reduction but has been limited so far to narrowband operation or restricted to distinctive environments. Fortunately, a photonic-enabled RF canceller can provide broadband interference cancellation using photonic components in a wideband vector modulator architecture with tunable time-delay taps. An example of this canceller with 20 canceller taps provides 25 and 20 dB of cancellation over 500-MHz and 1-GHz instantaneous bandwidths, respectively, and is tunable between 0.5 and 5.5 GHz. This photonic-enabled RF canceller provides the wideband operation and high tap counts for successfully deploying future wireless systems with IBFD technology.

Abstract: Embodiments of this application provide a data transmission method, a terminal device, and a network side device. Encoding, by a terminal device, a first identifier by using a first code word which is selected from at least one code word by the terminal device; sending, by the terminal device, the encoded first identifier to a network side device; receiving, by the terminal device, a second identifier sent by the network side device; decoding, by the terminal device, the second identifier by using the first code word; when the decoded second identifier is the same as the first identifier, encoding, by the terminal device, subsequent data by using the first code word; and sending, by the terminal device, the encoded subsequent data to the network side device.

Abstract: The present disclosure describes an optical device, a system including an optical receiver, and a system including an optical module. The optical device includes an Avalanche Photodiode (APD), a circuit board, a boost circuit disposed on the circuit board, a processor disposed on the circuit board and configured to control an output voltage of the boost circuit, and a probe point disposed on the circuit board. The boost circuit includes a control terminal electrically connecting to the processor. The boost circuit also includes an output terminal electrically connecting to the APD and the probe point respectively.

Abstract: There is provided a configuration that can prevent malfunction in bus communication even when a radio signal transmitted from a transmitter of an apparatus is received with a receiver of the same apparatus. A logic circuit outputs logic 1 to a transmitter in a case where logic 0 is input from a receiver to the logic circuit and a low-level logic signal is input from a processor to the logic circuit. The logic circuit outputs the low-level logic signal to the processor in a case where the logic 1 is input from the receiver and a radio signal received with the receiver is a radio signal transmitted from a communication counterpart. The logic circuit outputs a high-level logic signal to the processor in a case where the logic 1 is input from the receiver and a radio signal received with the receiver is a radio signal transmitted from the transmitter.

Abstract: In an example, the present invention includes an integrated system on chip device. The device has a variable bias block configured with the control block, the variable bias block being configured to selectively tune each of a plurality of laser devices provided on the silicon photonics device to adjust for at least a wavelength of operation, a fabrication tolerance, and an extinction ratio.

Abstract: In one embodiment, there is provided an apparatus for converting an analogue radio-frequency (RF) signal to an optical signal. The apparatus may include: a vapor cell enclosing a gas of atoms; a probing light source configured to propagate a probing light beam through the vapor cell, a frequency of the probing light beam being tuned across a range in which the atoms transition from a first quantum state to a second quantum state; and, a coupling light source configured to propagate a coupling light beam through the vapor cell, a frequency of the coupling light beam being resonant or off-resonant with transition of the atoms from the second quantum state to a Rydberg state; wherein the vapor cell is configured such that on exposure thereof to an RF field carrying information from the RF signal, the apparatus is configured to encode the RF signal into the probing light beam.

Abstract: Disclosed in some examples, are optical devices, systems, and machine-readable mediums that send and receive multiple streams of data across a same optical communication path (e.g., a same fiber optic fiber) with a same wavelength using different light sources transmitting at different power levels—thereby increasing the bandwidth of each optical communication path. Each light source corresponding to each stream transmits at a same frequency and on the same optical communication path using a different power level. The receiver differentiates the data for each stream by applying one or more detection models to the photon counts observed at the receiver to determine likely bit assignments for each stream.

Abstract: An optical communication method is an optical communication method for performing optical communication with a light-emitting device serving as a communication target. The optical communication method includes: a first step of reading information relating to a distance to the light-emitting device and information relating to a size of a light-emitting region included in the light-emitting device, the information relating to the distance and the information relating to the size being stored in advance; a second step of controlling an imaging range of a camera based on the information relating to the distance and the information relating to the size, the camera capturing an image of light from the light-emitting device; and a third step of extracting a signal from light emitted from the light-emitting device based on image data that the camera has captured in the imaging range.

Abstract: Embodiments of this application relate to a signal receiving apparatus and method. The receiving apparatus includes: a signal receiving module, configured to detect a reference pulse signal in a received optical pulse signal where the optical pulse signal is the reference pulse signal and a quantum optical pulse signal; and a synchronization clock module, configured to obtain a modulation pulse signal based on the reference pulse signal. A first intensity modulator in the signal receiving module is configured to obtain, based on the modulation pulse signal, a first local-frequency optical pulse signal having same timing as the optical pulse signal, and the signal receiving module uses the first local-frequency optical pulse signal to interfere with the reference pulse signal and the quantum optical pulse signal separately to obtain a raw key.

Abstract: A test instrument can be coupled to a test point in a passive optical network to measure optical signals transmitted between an optical line terminal and an optical network unit in the optical network. The test instrument can capture an identifier of the ONU from downstream signals sent from the OLT to the ONU.

Abstract: A full duplex communication network includes an optical transmitter end having a first coherent optics transceiver, an optical receiver end having a second coherent optics transceiver, and an optical transport medium operably coupling the first coherent optics transceiver to the second coherent optics transceiver. The first coherent optics transceiver is configured to (i) transmit a downstream optical signal at a first wavelength, and (ii) simultaneously receive an upstream optical signal at a second wavelength. The second coherent optics transceiver is configured to (i) receive the downstream optical signal, and (ii) simultaneously transmit the upstream optical signal. The first wavelength has a first center frequency separated from a second center frequency of the second wavelength.

Abstract: A reconfigurable optical add/drop multiplexer (ROADM) complex in an optical network may include one or more core ROADM devices, each including multiple input/output port pairs configured for respective wavelengths or wavelength bands to be coupled to a fiber distribution panel (FDP) over fiber. The FDP may include multiple FDP connectors to receive optical signals from the core ROADM device(s) and may extract and route optical signals having a single wavelength to respective transponder connectors of the FDP for coupling to a transponder. Multiple expansion options may be enabled at the FDP. For example, according to one option, a single expansion connector may be enabled for coupling to an expansion device to provide additional drop port capacity. In another example, multiple expansion connectors may be enabled for coupling to respective expansion devices.

Abstract: In some examples, an apparatus includes a multi-layer code generator to generate codewords based on application of a plurality of layers of encoding, an optical source to produce encoded optical pulses based on the generated codewords, and an optical coupler to propagate the encoded optical pulses to an optical medium.

Abstract: An optical wireless power transfer system including a transmission module having a power light source configured to output power light; a communication light source configured to output communication light; a mirror disposed in a light path of the power light source and the communication light source and configured to pass the power light and reflect the communication light; and a transmitting processor configured to modulate the communication light to have a first modulation. The wireless power transfer system also includes a reception module having a photoelectric cell configured to receive the power light from the transmission module and generate power; a retro-reflector configured to retro-reflect the communication light back to the transmission module; and a receiving processor configured to control the retro-reflector to reflect the communication light to have a second modulation based on the power generated by the photoelectric cell.

Abstract: A system is configured to receive a geographical indicator, to determine at least one light beacon (61-69) based on the geographical indicator, to output information (82) identifying the at least one light beacon, to receive a selection of one or more (61-68) of the at least one light beacon, to receive a content item or a reference to a content item in relation to the one or more light beacons, and to associate the content item with the one or more light beacons. The association causes the one or more light beacons to transmit data via visible light which enables reproduction of the content item.

Abstract: An apparatus includes an optical data receiver to receive a phase-modulated optical signal and to demodulate data therefrom. The optical data receiver includes an optical power splitter, first and second optical intensity detectors, and a digital signal processor. The digital signal processor is connected to receive digital values of intensity measurements of each of the optical intensity detectors. The first optical intensity detector is connected to receive light from the optical power splitter via a first optical path, and the second optical intensity detector is connected to receive light from the optical power splitter via a second optical path. The first and second optical paths have channel functions with different frequency dependencies.

Abstract: A traffic control method and apparatus for solving service quality degradation caused by traffic overhead in a specific node, on which traffic is concentrated in the specific node because of traffic congestion in a software defined network (SDN) environment. A traffic control method to be performed by an SDN controller of an SDN environment includes: collecting real-time traffic state information of a network; detecting traffic overhead of at least one node on the basis of the collected real-time traffic state information; determining whether network resources are available to the at least one node where the traffic overhead is detected; and changing a service level agreement (SLA)-based bandwidth allowable capacity with regard to the at least one node in accordance with available network resources.