Abstract: A wavelength conversion apparatus includes: a first demultiplexer wavelength-separating an optical signal having wavelengths of a first band wavelength-multiplexed into n drop signals acquired by wavelength-multiplexing optical signals of predetermined wavelengths and a through signal acquired by wavelength-multiplexing an optical signal of a wavelength being not a target of wavelength conversion; a second demultiplexer demultiplexing optical signals of the predetermined wavelengths included in the n drop signals into optical signals; n wavelength converters wavelength-converting first optical signals of wavelengths included in the optical signals into second optical signals of the second band; n first multiplexers multiplexing the wavelength-converted second optical signals, and outputting n third optical signals; and a multiplexing unit multiplexing and outputting the n third optical signals, an optical signal acquired by wavelength-multiplexing wavelengths of a second band previously wavelength-separated f

Abstract: A remote control device configured to control an electronic device including: a plurality of input keys; a signal transmitter; and a processor configured to: identify a time interval between a first radio signal and a second radio signal based on a length of the first radio signal, and based on one of the plurality of input keys being consecutively selected, control the signal transmitter to repeatedly output the second radio signal corresponding to the selected input key according to the identified time interval, where the first radio signal is configured to control an external electronic device communicating with the electronic device based on the second radio signal received from the remote control device.

Abstract: An optical system includes an optical antenna configured to receive and/or transmit laser beams through a first aperture, a gimbal-mounted deformable mirror (GDM) configurable to correct aberrations of a received laser beam, a power selector configurable to split the received laser beam into a first light beam and a second light beam, a wavefront sensor configured to measure a wavefront of the first light beam, a collimator configured to couple the second light beam into an optical fiber, and a controller configured to control the GDM for laser beam tracking and for correcting the aberrations of the received laser beam based on the wavefront of the first light beam measured by the wavefront sensor. The GDM is configurable to scan, within a field of regard (FOR), a beacon beam to be transmitted for laser beam tracking; or scan within the FOR to acquire a beacon beam transmitted by a terminal.

Abstract: A module for use in an optical network includes one or more elements concatenated to one another; and circuitry configured to receive and store calibration data associated with the one or more elements, and transmit the calibration data to one or more processing devices for modeling of the module in a link in the optical network. The one or more elements can include gain blocks for optical amplification. The calibration data can be determined at manufacturing via testing. The calibration data can relate to determining gain and noise transfer functions of the module at various operating points.

Abstract: An optical computing apparatus and system and a computing method are provided. The optical computing apparatus includes a linear operation module, a first delay module, and a coupler. The linear operation module can modulate, based on received electrical signals, optical signals input to the linear operation module; the first delay module may adjust a delay of optical signals output by the linear operation module; and after the first delay module adjusts the delay of the optical signals output by the linear operation module, the coupler may combine a plurality of groups of optical signals successively output by the linear operation module, to output one group of optical signals used to indicate a computing result that is obtained after a multiply-add operation is performed on one group of data and weights.

Abstract: A wavelength-tunable optical transmission unit repeatedly transmits a first channel setting optical signal while changing a transmission channel until a wavelength-tunable optical reception unit receives a second channel setting optical signal in response to a first instruction signal. When the wavelength-tunable optical reception unit receives the second channel setting optical signal, a channel indicated by second channel information is set as a channel of an optical signal to be received by the wavelength-tunable optical reception unit. When a second instruction signal is received after the first instruction signal is received, a channel of an optical signal to be transmitted by the wavelength-tunable optical transmission unit is set to a first designated channel, and a channel of an optical signal to be received by the wavelength-tunable optical reception unit is set to a second designated channel.

Abstract: Systems and methods for transducing and storing qubit signals are provided. The system includes a voltage source, a substrate, and a membrane suspended over the substrate. A phononic crystal oscillator is disposed in a first region of the membrane. The phononic crystal oscillator includes a capacitor having a moving electrode including an array of multiple phononic crystal unit cells. The moving electrode is connected to the voltage source. A superconducting circuit disposed in a second region of the membrane. A plurality of phonon shields and an optical resonator may also be disposed on the membrane.

Abstract: In an optical wireless communication, OWC, network (100), time division multiple access, TDMA, is commonly used for interference suppression among multiple network devices (D1-Dn) associated to a single coordinator, or among adjacent coordinators (C1-Cn). However, an offset of MAC cycles among two adjacent coordinators (C1-C2) may still result in interference to a network device (D1) located in the overlapping area of the coverage areas of these two adjacent coordinators (C1-Cn). This invention is directed to various methods, apparatus, systems, computer program and computer-readable media for providing a mechanism to make use of an out-of-band channel to send a signal from a network device (D1) to the two adjacent coordinators (C1-C2), for assisting the alignment of MAC cycles among the two adjacent coordinators (C1-C2), and the out-of-band channel has a line-of-sight character, and is out-of-band as compared to the OWC network (100).

Abstract: The present specification provides a quantum secure direct communication (QSDC) method by which a transmitting end transmits a message on the basis of differential time coding, in a quantum communication system.

Abstract: A method is provided for securement of a network of optical fibers against attempts to detect sounds such as private conversations emitted in the vicinity of the fiber network such as in a secure room. The cable entering the room contains a plurality of fibers some of which have data and some are unused. It has been found that the sensitivity of systems such as DAS monitoring systems can detect such conversations from the vibration of the fibers in the vicinity. The method includes monitoring at least some of the fibers for detecting transmission therealong of light signals used for monitoring of fiber vibration which provide information on the sounds. An indication alert is emitted when detected of an intrusion attempt. A jamming signal can be transmitted along the detected fiber to prevent the monitoring. The monitoring and jamming can take place at a patch panel where the fibers are connected.

Abstract: A light communication system, receiver, and method for synchronizing a receiver with a transmitter so as to decode a data input stream transmitted by the transmitter and received at the receiver. The method includes: receiving a data input stream at a receiver, the data input stream having a first data rate that is set based on a transmitter clock rate; generating a wave; obtaining a phase error between the data input stream and the generated wave; determining a synchronized clock rate by using the phase error to adjust the frequency of the generated wave so as to match the frequency of the generated wave to the transmitter clock rate of the data input stream; and using the synchronized clock rate to decode the data input stream so as to obtain data encoded in the data input stream.

Abstract: The present invention relates to a method and a device for feed-forward carrier recovery in coherent optical communication. The present invention discloses the method and the device to receive an optical signal from a light source, wherein the optical signal comprises at least one pilot pulse and at least one signal pulse including information. Quadrature values of a plurality of samples of the at least one pilot pulse are determined using a local oscillator signal of a local oscillator source. A phase difference between the received optical signal of the light source and the local oscillator signal of the local oscillator source is determined using the quadrature values of the plurality of samples and the carrier information of the at least one signal pulse is recovered based on the determined phase difference.

Abstract: An apparatus (200) in a point-to-point optical wireless communication system, the apparatus comprises an optical receiver (210) configured to receive a signal; a power detector (202) configured to detect a signal strength of the received signal; a digital baseband module (203) configured to demodulate the received signal and measure a data rate of the received signal; and a controller (204) configured to derive a gain setting adjustment according to a change of the measured data rate when the detected signal strength is above a certain threshold.

Abstract: Methods, apparatus, and systems are disclosed for implementing a fiber optic reflectance standard (FORS) for testing and/or calibration of a test instrument (TI), which provides a traceable means to calibrate the making optical return loss measurements (ORLM). The apparatus for implementing the FORS may include an optical splitter, first and second optical inputs coupled to the optical splitter, and an optical fiber having first and second ends, and coupled to the optical splitter at the first end of the optical fiber. Furthermore, the apparatus includes an attenuator (e.g., a mechanical attenuator) configured to contain a portion of the optical fiber between the first and second ends and selectively attenuate optical signal gain of the optical fiber. The testing and/or calibration results in an uncertainty that is at least four times better than a typical test instrument.

Abstract: A receiver device for communication via modulated light transmission, intended to be coupled to a terminal which uses data received via modulated light, is disclosed. The receiver device includes at least one trough, said trough comprising: a slot for receiving at least one light ray of the modulated light, and a first guiding surface, coupled to the slot, said slot being arranged at the entrance to the first guiding surface, the first guiding surface comprising at least one internal surface which is reflective and shaped to guide the light ray by successive reflections to at least one photoreceiver coupled to the receiver device.

Abstract: A coherent optical receiver comprises a local oscillator, a polarization-diversity actuator configured for modifying an optical signal output by the local oscillator and a 2×2 coupler for coupling the optical signal output by the polarization-diversity actuator and a modulated optical signal received from a coherent optical transmitter. The local oscillator thus provides a boosting effect to the amplitude-shift keying modulated optical signal. The coherent optical receiver comprises a controlling unit performing a domain-switching procedure acting on ellipticity main axis orientation and/or ellipticity phase shift for coarse control of the polarization-diversity actuator, and a phase-refining procedure acting on a controlled error signal injected in the phase of the optical signal output by the polarization-diversity actuator for fine control of the polarization-diversity actuator.

Abstract: A method for validating service continuity of deployed fiber serving terminals in a passive optical network includes broadcasting, from a central office of a passive optical network, a beacon signal to a plurality of beacon responders, wherein each beacon responder of the plurality of beacon responders is connected to a respective fiber serving terminal of a plurality of fiber serving terminals of the passive optical network, changing a counter in response to each response message that is received from the plurality of beacon responders in response to the beacon signal, and generating a report indicating which fiber serving terminals of the plurality of fiber serving terminals are functioning properly and which fiber serving terminals of the plurality of fiber serving terminals are not functioning properly, based on whether a count of the counter is equal to an expected number of responses, after an expiration of a predefined period of time.

Abstract: A QSFP-DD optical transceiver module having more than four optical data ports and more than four electrical data ports is configured for approximately 10 Gb/s bidirectional data communication on each of the data ports, and is further configured to communicatively inter-connect each of the optical data ports thereof to a corresponding one of the electrical data ports thereof. The module may be used with a digital data router or switch having at least one QSFP-DD receptacle with eight electrical data ports and configured for parallel bidirectional communication with the QSFP-DD module plugged therein over at least five of the eight electrical data ports at 10 Gb/s per port and direction.

Abstract: An optical signal emitting direction control method of a present embodiment includes arranging a transparent member to extend over an underwater space and an in-air space, causing an optical signal to enter the transparent member from the underwater space via a surface of an underwater portion of the transparent member immersed in the underwater space, and causing the optical signal entered the transparent member to be emitted into the in-air space via a surface of an in-air portion of the transparent member exposed to the in-air space.

Abstract: The present disclosure provides an optical relay device, a signal transmission system and a method, belonging to the field of communication technology. The optical relay device includes: a first signal conversion part, used for modulating a received electrical signal converted from a microwave signal and converting the electrical signal to a laser signal for output; and a second signal conversion part, used for receiving the laser signal output by the first signal conversion part and converting the laser signal to an electrical signal for output.