Abstract: The present invention provides an optical transmitter including a semiconductor laser and a control method thereof for preventing crosstalk between channels in an NG-PON2 with a 100 GHz channel spacing by reducing a wavelength drift of the semiconductor laser. The wavelength drift occurs between a few nanoseconds and a few hundreds of nanoseconds from the beginning of a burst when the semiconductor laser is operated in a burst-mode.

Abstract: Methods, devices and systems for providing accurate measurements of timing errors using optical techniques are described. An example timing measurement device includes an optical hybrid that receives two optical pulse trains and produces two or more phase shifted optical outputs. The timing measurement device further includes two or more optical filters that receive the outputs of the optical hybrid to produce multiple pulse signals with distinctive frequency bands. The device also includes one or more photodetectors and analog-to-digital converters to receive to produce electrical signals in the digital domain corresponding to the optical outputs of the hybrid. A timing error associated with the optical pulse trains can be determined using the electrical signals in digital domain based on a computed phase difference between a first frequency band signal and a second frequency band signal and a computed frequency difference between the first frequency band signal and the second frequency band.

Abstract: An optical transmission system includes: first and second optical transmitting units for respectively transmitting first and second optical signals that are obtained, respectively, as a result of first and second frequency-multiplexed multi-channel signals being converted by means of FM batch conversion; a carrier monitoring function unit for monitoring each carrier signal included in the optical signals; an output adjustment unit for adjusting signal intensities of the optical signals and outputting the optical signals; a multiplexer for outputting a multiplexed signal of the optical signals; an amplifier for amplifying the multiplexed signal; and first and second optical receiving units for receiving the respective optical signals included in the amplified multiplexed signal. The output adjustment unit adjusts the respective signal intensities of the optical signals such that the signal intensity at each optical receiving unit is larger than or equal to a predetermined value.

Abstract: A GPS system within a structure. The system comprises a front-end unit (FEU) and a back-end unit (BEU); FEU receives a GPS signal, amplifying it if required and forwarding the signal to the BEU for further processing (and amplification if required) for determining the location. The BEU and FEU cooperate to optimize the received GPS signal before processing, exchanging control and operating parameters information related to receiving and processing the GPS signal. The BEU also supplies power to the FEU. Advantageously, exchange of signals and power between the BEU and FEU occurs over one or more fiber optic channels or conductors. Certain embodiments employ multiplexing and demultiplexing schemes to reduce the number of discrete signal paths between the FEU and BEU. Additionally, the system embodies a control algorithm to ensure adequate GPS signal strength for processing and also shuts the system down upon signal loss or degradation.

Abstract: A remote control apparatus is provided. The remote control apparatus includes a directional antenna, a communicator, and a processor configured to, based on a wireless signal being received from an external device through the directional antenna, identify an angle at which the wireless signal is received, based on the angle being within a predetermine range, obtain identification information of the external device by parsing the wireless signal, based on the identification information, identify whether the external device is registered to a server and based on identifying that the external device is not registered to the server, transmit a signal for requesting registration to the external device through the communicator.

Abstract: A powered device of an optical power supply system includes a photoelectric conversion element, a semiconductor laser for feedback and a control device. The photoelectric conversion element converts feed light into electric power, wherein the feed light is from a power sourcing equipment. The semiconductor laser oscillates with a portion of the electric power, thereby outputting feed light to a power supplying side. The control device monitors a power supply amount of the electric power to a load, and according to the power supply amount, controls an electricity-light conversion amount of conversion that is performed by the semiconductor laser.

Abstract: An electronic component such as a fan-less component for a 5G system having an expansion card and optical transceivers is disclosed. The electronic component has a chassis heat sink having a contact surface and a printed circuit board. A transceiver cage is located on the printed circuit board. The cage receives the optical transceiver. The transceiver cage is in thermal contact with the optical transceiver. The system includes a bracket having a heat sink support with a flat surface in thermal contact with the contact surface of the chassis heat sink. The bracket has a transceiver support having a flat surface in thermal contact with the optical transceiver and supporting the expansion card. A connector support is coupled to the heat sink support and the transceiver support. Heat from the optical transceiver is transmitted through the transceiver, connector, and the heat sink supports to the chassis heat sink.

Abstract: Circuitry of an optical line terminal (OLT) can be controlled to be compatible with optical modules of different optical protocols having different electrical connectivity requirements. In some embodiments, the OLT has a controller that is configured to communicate with an optical module plugged or otherwise mated with a socket of the OLT in order to discover a module type of the optical module. Based on the detected module type, the controller is configured to control the electrical characteristics of the OLT circuitry so that it is compatible with the electrical and operational requirements of the optical module. Thus, the OLT is compatible for use with any of a plurality of optical module types.

Abstract: The present disclosure relates to a method, a system and a computer readable storage medium for controlling protection switching on an optical network. The method for controlling protection switching on an optical network includes: determining a low-frequency signal for service protection, and modulating the low-frequency signal for service protection to a transmission channel of a service signal to be protected and transmitting the low-frequency signal; detecting the low-frequency signal over the transmission channel and acquiring transmission quality information of the low-frequency signal; and determining whether to perform protection switching according to the transmission quality information of the low-frequency signal.

Abstract: An optical transmission system transmits a Radio Frequency (RF) signal by a frequency division multiplexing method. The optical transmission system includes a Transmitter Optical SubAssembly (TOSA), an optical fiber, and a Receiver Optical SubAssembly (ROSA). The TOSA includes a surface emitting laser diode configured to be capable of emitting light at output of 0.8 mW or more. In the optical transmission system including the surface emitting laser diode, a noise index obtained by a measurement method including a predetermined step is 10.0 dB?V or less.

Abstract: Disclosed are an impedance correcting method and apparatus, and an impedance-corrected signal line for an optical transceiver. The impedance correction method includes receiving an impedance according to an error of a resin applying process of a signal line for an optical transceiver, acquiring a correction parameter for generating a correction impedance based on the impedance according to the error, and determining the correction impedance for correcting the impedance according to the error based on the correction parameter.

Abstract: Methods and systems for monitoring an optical network are described. An optical device may receive a data signal. The optical device may send the data signal to a test port. A measuring device may measure characteristics associated with the data signal.

Abstract: A method and an apparatus for transmission using an interface, and a device. The method includes: obtaining a byte block stream, where byte blocks in the byte block stream are of a predetermined byte length; mapping the byte block stream to corresponding timeslots, where each timeslot corresponds to one byte block; distributing the byte block stream mapped to the timeslots; processing the distributed byte block stream based on an interface type configured for a physical interface; and sending the processed byte block stream. In the embodiments, data is transmitted based on a byte block distribution mechanism, to support different interface types, and a coupling relationship between service adaptation and a physical layer is decoupled, so that evolution and extension of transmission interface types do not affect a service adaptation procedure, thereby simplifying a transmission system.

Abstract: A system, a non-transitory computer readable media and a method for intra data center optical communication, the method may include (a) receiving an optical input signal by a coherent optical receiver of a second unit of a data center; wherein each input optical signal represents a transmitted optical signal that was transmitted by a coherent transmitter of a first unit of the data center; wherein the transmitted optical signal is generated by modulating a transmitter laser signal that is outputted from a laser of the coherent transmitter; (b) generating, by a controllable laser of the coherent optical receiver, a reference signal; wherein a frequency of the reference signal is controlled by a processor of the coherent optical receiver; and (c) recovering data embedded in the optical input signal; wherein the recovering of the data comprises optically processing the reference signal and the optical input signal.

Abstract: A powered device of an optical power supply system includes a photoelectric conversion element, a semiconductor laser for feedback and a control device. The photoelectric conversion element converts feed light into electric power, wherein the feed light is from a power sourcing equipment. The semiconductor laser oscillates with a portion of the electric power, thereby outputting feed light to a power supplying side. The control device monitors a power supply amount of the electric power to a load, and according to the power supply amount, controls an electricity-light conversion amount of conversion that is performed by the semiconductor laser.

Abstract: One example optical transceiver includes an optical interface, an optical receiver, and a polarization-maintaining optical waveguide, where the optical receiver includes a mixer, an optical-to-electrical converter, an analog-to-digital converter, and a digital signal processor.

Abstract: An optical transmission system includes light supply devices, light receiving devices, an optical fiber cable, an electric power combiner and a data processing unit. MIMO communication is performed by the light receiving devices receiving signal beams having signals different from one another, output from the light supply devices and transmitted through a single core or cladding of the optical fiber cable. The signal beams are feed beams. The light supply devices output the feed beams with signals different from one another superimposed thereon by modulation. The light receiving devices convert the feed beams transmitted thereto into electric powers. The electric power combiner combines the electric powers obtained by the conversion. The data processing unit obtains signals superimposed on the feed beams received by the light receiving devices, and based on the obtained signals, obtains the signals superimposed by the light supply devices on the feed beams.

Abstract: A wavelength conversion device includes a wavelength converter converts a wavelength band of a wavelength-division multiplex signal, a first wavelength filter transmits the wavelength-division multiplex signal on an input side of the wavelength converter, a second wavelength filter transmits the wavelength-division multiplex signal on an output side of the wavelength converter, and a controller controls a temperature of the wavelength converter such that a difference between a ratio of power of the wavelength-division multiplex signal which is not transmitted through the first wavelength filter on the input side to power of the wavelength-division multiplex signal which have been transmitted through the first wavelength filter on the input side and a ratio of a power of the wavelength-division multiplex signal which is not transmitted through the second wavelength filter on the output side to power of the wavelength-division multiplex signal which have been transmitted through the second wavelength filter.

Abstract: A method of manufacturing an optical multiplexer/demultiplexer includes the steps of: detachably holding optical filters and a mirror respectively to one surface and to the other surface of a pair of mutually parallel surfaces of gripping jigs; gripping a block holder between the gripping jigs with interposition of adhesive layers so as to reflect the parallelism of the pair of the surfaces; heating the gripping jigs gripping the block holder; and cooling the gripping jigs with them gripping the block holder. The optical filters and the mirror are thereby bonded to the block holder in parallel to each other.

Abstract: A system comprising an optical receiver for multi-wavelength-channel optical communication, an optical source of spontaneous emission light and a tunable optical filter connected to receive the light at an input. The tunable optical filter can have a filter spectrum with spectral passbands separated by spectral notches. The system also includes an optical fiber link connecting an output of the optical filter to the optical receiver for multi-wavelength-channel optical communication. The receiver can be configured to make a measurement indicative of an optical power level in at least one of the notches or to make measurements of optical power levels and at least one of the passbands and at least one of the notches in response to the optical source transmitting the filtered light to the optical fiber link.