Abstract: Systems and methods for detecting fiber port availability in a fiber distribution hub and generating fiber port recommendations are presented. An exemplary method may include detecting, based at least on a fiber distribution record, one or more candidate ports in the fiber distribution hub; transmitting a first indication of a first selected port of the one or more candidate ports to a computing device; detecting, after transmitting the indication of the first selected port and in real time, that a termination unit associated with the fiber distribution hub has been disconnected; automatically updating the fiber distribution record such that the fiber distribution record is representative of an association between the termination unit and the first selected port; and generating, based on detecting that the termination unit has been disconnected, a second indication of a second selected port of the one or more candidate ports.

Abstract: An apparatus includes a photonic integrated circuit having an optical phased array, where the optical phased array includes multiple unit cells. Each unit cell includes (i) at least one antenna element configured to transmit or receive optical signals and (ii) a modulator configured to phase-shift the optical signals transmitted or received by the antenna element. Each unit cell is configured to transmit or receive light having multiple polarizations in the optical signals.

Abstract: An underwater communication system, wherein the underwater communication system is capable of increasing a data transmission through a visible light between a surface and underwater of a swimming pool and an underwater communication method providing the data transmission between the surface and the underwater of the swimming pool are provided.

Abstract: A compact photonic converter for radio frequency (RF) signals comprising fewer components than in the prior art. The fields of the invention are electronics, oscillating circuits, radio frequency circuits and optoelectronics. The converter comprises an optoelectronic oscillator (OEO), which is the local oscillator (LO) for the frequency conversion operation, and an RF signal injection circuit. The OEO uses a single Mach-Zehnder (MZ) electro-optic modulator and a single photodetector to enable simultaneous up/down frequency conversion of the radio frequency signal from the input of the converter. The frequency conversion is based on the intermodulation that occurs inside the MZ modulator.

Abstract: An objective is to provide a terminal device, a communication method, and a communication system in which the time taken by connection operations/authentication operations does not increase proportionally with the pattern length, even if the transmitting side and the receiving side are not synchronized. A terminal device, a communication method, and a communication system according to the present invention create n pieces of signal information (n-bit patterns) by sequentially shifting each bit of a single piece of received signal information (n-bit pattern) one bit at a time. Through the above, signal information time-shifted by one bit each is obtained. Thus, even if the transmitting side and the receiving side are not synchronized, one of the n pieces of signal information is a signal synchronized with the transmitting side. Thereafter, the signal synchronized with the transmitting side can be detected by a brute-force calculation with the patterns (ID information) in the list.

Abstract: An optical transmitter for transmitting a vector of information symbols over an optical fiber transmission channel made of a multi-core fiber, optical signals carrying the vector of information symbols propagating along the multi-core fiber according to two or more cores, wherein the optical transmitter includes a precoder configured to determine a precoding matrix depending on one or more fiber parameters associated with the multi-core fiber and to precode the vector of information symbols by multiplying the vector of information symbols by the precoding matrix.

Abstract: An OLT 110 includes an optical transmission/reception unit 111 to transmit and receive optical signals by time division; an abnormal-light-emission detection unit 112 to monitor the received optical signals, and detect a state in which the optical signals are being received for a predetermined period or longer as abnormal light emission in which the optical signals from one or more of the ONUs 130 are not received; an optical-communication control unit to sequentially select an ONU 130 one at a time from the plurality of ONUs 130 other than the one or more ONUs 130 as a target ONU 130, test whether the abnormal light emission is resolved by stopping transmission of the optical signal from each target ONU 130, and, if the abnormal light emission is resolved, specifies the target ONU 130 being tested as an ONU 130 that is a source of the abnormal light emission.

Abstract: The invention provides a visible light communication system with adaptive dimming and a modulation and demodulation method. The system includes: a source; an adaptive M-PAM modulator, separately modulating a signal transmitted by the signal source into a first and a second electrical signal; and a dual-path pulse generator, alternately generating a first and a second pulse control signal, where the first and the second pulse control signal are both periodic signals, where when a remaining operating duration of a high level of the first pulse control signal equals to a time of a rising edge of the second pulse control signal, the second pulse control signal starts to be generated, and when a remaining operating duration of a high level of the second pulse control signal is equal to a time of a rising edge of the first pulse control signal, the first pulse control signal starts to be generated.

Abstract: An optical signal receivers, systems including the optical signal receivers, and methods of operating the same include a multimode fiber circulator including a first port, a second port, and a third port, a first multimode fiber cable coupled to the first port and having an input configured to receive a complex modulated optical signal and provide the complex modulated optical signal to the first port of the multimode fiber circulator, a second multimode fiber cable including a low Q optical resonator coupled to the second port of the multimode fiber circulator that is configured to receive the complex modulated optical signal from the second port of the multimode circulator, and a third multimode fiber cable coupled to the third port of the multimode fiber circulator that is configured to receive a reflected optical signal from the third port of the multimode circulator, the reflected optical signal being reflected from the low Q optical resonator.

Abstract: A transmitter may include a digital signal processor (DSP) to generate an electrical signal associated with a beacon and a data signal. The transmitter may include an electro-optical component to convert the electrical signal to an optical signal to be transmitted by the transmitter. The beacon and the data signal may be on a common wavelength in the optical signal. A power of the beacon within the optical signal may be based on a value of an amplitude modulation factor applied to the beacon by the DSP in association with generating the electrical signal.

Abstract: An apparatus for generating a time-delayed product of two independent signals includes a fixed-wavelength laser. A first optical modulator is optically coupled to the fixed-wavelength laser and configured to modulate a fixed wavelength optical carrier with a first input signal of a set of input signals. The apparatus also includes a tunable laser. A second optical modulator is optically coupled to the tunable laser and configured to modulate a tunable optical carrier with a second input signal of the set of input signals. The apparatus also includes a dispersive element coupled to the second optical modulator, a first optical detector coupled to the dispersive element, a third optical modulator optically coupled to the first optical detector and the first optical modulator, an optical 90-degree hybrid element optically coupled to the third optical modulator, and a plurality of optical detectors optically coupled to the optical 90-degree hybrid element.

Abstract: Techniques for determining an alternative communication mode for vehicle-to-vehicle communication at a host vehicle can include monitoring the primary mode of RF communication to ensure it is effectively communicating and, if not, intelligently selecting a backup communication mode comprising one or more other sensors and/or systems of the vehicle. The selection of the backup communication mode may take into account various factors that can affect the various modes of communication from which the backup communication mode is selected.

Abstract: An optical transmission system including: N transmitters, each of the N transmitters being configured to convert one of N electrical signals indicating data sequences different from one another into an optical signal; a signal generator configured to cause N optical splitters to split the N optical signals output from the N transmitters to convert the N optical signals into M optical signals; a multiplexer configured to convert the M optical signals converted by the signal generator into one mode-multiplexed signal that is excitable in at least M modes; a demultiplexer configured to convert the mode-multiplexed signal converted by the multiplexer into M optical signals; M receivers, each of the M receivers being configured to convert one of the M optical signals converted by the demultiplexer into the electrical signal; and a signal detector configured to perform signal separation on the M electrical signals converted by the M receivers to extract the N data sequences.

Abstract: A communication device includes: a first transmission-reception unit connected with a first optical line terminal; a second transmission-reception unit connected with a second optical line terminal; and a control unit, the first transmission-reception unit acquires a control signal having a destination at the second or third optical line terminal from the first optical line terminal, the control unit forwards the control signal toward the second transmission-reception unit connected with the second or third optical line terminal, and the second transmission-reception unit forwards the control signal to the second or third optical line terminal.

Abstract: An optical transmission system includes a plurality of transmission lines through which a mode-multiplexed signal obtained by multiplexing a plurality of optical signals of different types of modes is transmitted, and one or more mode group permutation units provided between the plurality of transmission lines. The mode group permutation unit changes, on a mode-group-by-mode-group basis, an optical signal of a mode belonging to a mode group to an optical signal of another mode belonging to a mode group after permutation corresponding to the mode group in such a manner that modes are interchanged between at least some of the plurality of optical signals multiplexed into the mode-multiplexed signal input from one of the plurality of transmission lines on an input side, and outputs the mode-multiplexed signal after mode interchange to one of the plurality of transmission lines on an output side.

Abstract: In a method for a data transmission between first and second modules, and a system having mobile parts for performing the method: the time bases of the first and second modules are synchronized; transmitters of the first module emit a light signal pulse individually one after the other and/or in numbered order in a respective time range; the particular receiver of the second module at which the strongest receive signal occurs is determined, the particular time range and/or the number of the particular time range being determined in which the strongest receive signal occurs; the determined time range and/or the determined number is/are transmitted from the second module to the first module; and the transmitter of the first module associated with the determined time range and/or to the determined number is determined and used for the subsequent data transmission from the first module to the second module.

Abstract: A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable, a power storage and a controller. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light into electric power. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The power storage stores the electric power. The controller performs a process of lowering an output level of the feed light in response to a value related to an electric power amount of the electric power stored in the power storage being equal to or higher than a predetermined threshold value, and performs a process of raising the output level in response to the value being lower than the predetermined threshold value.

Abstract: This application provides an optical link fault identification method, and relate to the field of communications technologies. The method includes: obtaining performance data of a network device, extracting a feature parameter of the performance data, and identifying a fault mode on an optical link based on the feature parameter. The method resolves problems of a difficulty in fault identification and slow troubleshooting that are caused by a large quantity of devices, many line faults, and a difficulty in obtaining manual troubleshooting cases. In addition, a fault can be quickly identified when the fault occurs, improving troubleshooting efficiency. When an optical link risk does not cause a fault, deterioration of the performance data can be found in advance based on a feature, to perform identification and warning.

Abstract: A wireless optical communication network includes a base station established for wireless optical communication using a wireless optical signal and including a participant apparatus moveable with respect to the base station including a communication unit established for wireless optical communication. Further, the participant apparatus includes a deflection unit configured to deflect at least part of the wireless optical signal between a first direction between the deflection unit and the communication unit and a second direction between the deflection unit and the base station.

Abstract: Systems and methods to transmit audio-video signals over an optical communication channel are described. One aspect includes receiving a plurality of audio-video electrical signals at an optical transmitter. The optical transmitter may also receive a plurality of out-of-band electrical signals. The optical transmitter may collectively modulate the audio-video electrical signals to generate a composite electrical signal. In one aspect, the optical transmitter bias current-modulates a bias current level of the composite electrical signal using the electrical out-of-band signals, and generates a modulated electrical signal based on the bias current-modulating. The optical transmitter may convert the modulated electrical signal into a modulated optical signal using a laser diode, and transmit the modulated optical signal to an optical receiver over an optical communication channel.