Abstract: A telecom system is disclosed with a laser controlled by an acousto-optic deflector including an optical element having a surface with one or more steps formed thereon; a conductive layer formed on the surface with the steps; one or more crystals secured to each step; and electrodes positioned on each surface of each crystal.

Abstract: An optical wireless communication (OWC) system comprising a first device comprising a transceiver apparatus and a plurality of further devices each comprising a respective further transceiver apparatus. The first device communicates via an optical channel with the plurality of further devices.

Abstract: The photonic integrated chip includes a laser light source configured to generate an optical carrier, a first optical splitter configured to split the optical carrier into a first optical carrier and a second optical carrier, an optical local oscillation generation unit, and a photonic frequency conversion unit. The first optical splitter sends the first optical carrier and the second optical carrier to the photonic frequency conversion unit and the optical local oscillation generation unit. The optical local oscillation generation unit generates an optical local oscillation signal and send the optical local oscillation signal to the photonic frequency conversion unit. The photonic frequency conversion unit converts a first intermediate frequency signal into a first radio frequency signal through photonic up-conversion. The photonic frequency conversion unit converts a second radio frequency signal into a second intermediate frequency signal through photonic down-conversion.

Abstract: There is provided a communication method used in a communication system in which a plurality of communication apparatuses is connected by an optical ring network, the communication method including: setting one of the plurality of communication apparatuses as a master communication apparatus and the other communication apparatuses as slave communication apparatuses, causing the master communication apparatus to transmit an optical signal at transmission timing determined in the master communication apparatus; causing the master communication apparatus to transmit an assignment signal for assigning, to the slave communication apparatuses, transmission timing at which an optical signal on at least one wavelength is time-division multiplexed and transmitted; and causing the slave communication apparatuses to transmit an optical signal to the optical ring network based on transmission timing assigned by the assignment signal received from the master communication apparatus.

Abstract: An apparatus embedded with one or more terahertz transceivers is described. The one or more terahertz transceivers based on at least one resonant tunnelling diodes is provided to facilitate wireless communication in the apparatus, where the apparatus is embedded with one or more planar antennas. The transceiver operates in terahertz and may be coupled to one or two different antennas, one for transmission and the other for reception.

Abstract: The present disclosure relates to a fiber optic network configuration having an optical network terminal located at a subscriber location. The fiber optic network configuration also includes a drop terminal located outside the subscriber location and a wireless transceiver located outside the subscriber location. The fiber optic network further includes a cabling arrangement including a first signal line that extends from the drop terminal to the optical network terminal, a second signal line that extends from the optical network terminal to the wireless transceiver, and a power line that extends from the optical network terminal to the wireless transceiver.

Abstract: An optical network terminal receives optical digital data that includes chirp. The optical network terminal processes the signal representative of the optical digital data from the optical network terminal in a manner determines changes in logic levels based upon temporary wavelength changes of the signal.

Abstract: An adapter includes a waterproof container, a photoelectric conversion device housed in the waterproof container and connected to an optical cable, and an attachment structure provided at the waterproof container, for use in detachably attaching the adapter to an ROV.

Abstract: This application discloses an optical network system, a management device, an optical transmission apparatus, and a communications device, and belongs to the field of optical network technologies. A first communications device in the optical network system is configured to send physical information of the first communications device to a second communications device, where the physical information includes first module information of a first optical transmission apparatus. The second communications device is configured to determine a working status of the optical network system based on the first module information, second module information of a second optical transmission apparatus, and link information of an optical fiber link.

Abstract: System, method, and instrumentalities are described herein for transmitting information optically. The optical source may be configured to generate a beam. The beam may include a series of light pulses. The beam of light may be modulated. A modulator may be configured to modulate the series of light pulses in response to a data transmission signal, thereby encoding transmission data into the series of light pulses. The modulated beam of light may be received and both amplified and filtered. The filtered beam of light may be transmitted from to a detector having a photoreceiver. The photoreceiver may be configured to extract the transmission data from the filtered beam of light.

Abstract: A 10G rate OLT terminal transceiver integrated chip based on XGSPON with EML laser includes: a burst mode receiver RX which processes amplitude detection, and outputs the signal whose amplitude and waveform pulse width met the threshold requirements to a host, and comprises a fast recovery module to discharge charges in an AC coupling capacitor to achieve multi-packet transmission without mutual interference and to meet the timing sequence requirement of the XGSPON protocol; a continuous mode transmitter TX which receives the electrical signal attenuated by a PCB board, and selects a bypass BYPASS path or a clock data recovery CDR path according to a degree of attenuation to drive the EML laser; a digital control unit DIGIITAL which communicates with the host and provides control signals to the burst mode receiver RX and the continuous mode transmitter TX; and a power module POWER.

Abstract: A 10G rate OLT terminal transceiver integrated chip based on XGPON and EML laser includes: a burst mode receiver RX which amplifies an electrical signal originated each ONU client and processed through a burst mode receiver TIA, processes amplitude and frequency double-detection, and outputs the signal whose amplitude and waveform pulse width met the threshold requirements to a host, and comprises a fast recovery module to meet the timing sequence requirement of the XGPON protocol; a continuous mode transmitter TX which receives the electrical signal attenuated by a PCB board, and selects a bypass BYPASS path or a clock data recovery CDR path according to a degree of attenuation to drive the EML laser; a digital control unit DIGIITAL which provides control signals to the burst mode receiver RX and the continuous mode transmitter TX; and a power module POWER to supply working power to the chip.

Abstract: A signal pre-compensation method is provided. In the method, at least one target frequency subband is determined from a plurality of frequency subbands of a first optical signal and an optical signal of the at least one target frequency subband in the first optical signal is demodulated based on the at least one target frequency subband. A first electrical signal is obtained after demodulation, and a pre-compensation parameter is updated based on the at least one target frequency subband, the first electrical signal, and a second electrical signal. Herein the pre-compensation parameter is used to perform signal pre-compensation on the second electrical signal, and the first optical signal is generated after the pre-compensation is performed on the second electrical signal.

Abstract: Provided are a state transition method and apparatus, a device, and a storage medium. The method comprises: an optical network unit verifies a received physical synchronization sequence field, and transitions the current state according to a verification result. As such, the probability of downstream synchronization detection can be effectively improved, and the probability of missed downstream synchronization detection can be reduced, thereby ensuring the normal operation of a PON system.

Abstract: Methods, systems, and devices for free-space optical communications. An aircraft includes a flat optical communication terminal on an external surface of the aircraft, the flat optical communication terminal being configured to communicate with a ground station via a free-space optical communication link.

Abstract: Disclosed herein are methods, systems, and devices for bandwidth steering. Systems may include a plurality of compute nodes configured to execute one or more applications, a plurality of first level resources communicatively coupled to the plurality of compute nodes, a plurality of second level resources communicatively coupled to the plurality of first level resources, and a plurality of third level resources communicatively coupled to the plurality of second level resources. Systems may also include a plurality of optical switch circuits communicatively coupled to the plurality of first level resources and the plurality of second level resources, wherein each of the plurality of optical switch circuits is coupled to more than one of the plurality of the first level resources and is also coupled to more than one of the plurality of the second level resources.

Abstract: A network element includes at least one processor and at least one memory. The at least one non-transitory memory including computer program code configured to, when executed by the at least one processor, cause the apparatus to determine whether a bit error rate (BER) of a FEC codeword is at or below a correctable BER, wherein the FEC codeword is transmitted between an OLT and ONU, a first percentage of the FEC codeword is at a lower order modulation, and a second percentage of the FEC codeword is at a higher order modulation, establish, based on a determination that the BER is at or below the correctable BER, a connection between the OLT and the ONU at the higher order modulation, and maintain, based on a determination that the BER is greater than the correctable BER, the connection between the OLT and the ONU at the lower order modulation.

Abstract: A wireless radio frequency conversion system is disclosed. The wireless radio frequency conversion system includes a primary distributing device, a one-to-many conversion device, a plurality of first optical fiber networks, a plurality of remote antenna devices, and a plurality of antennas. The primary distributing device is configured to receive a first photoelectric signal. The one-to-many conversion device is configured to perform an optical-electrical conversion and a one-to-many conversion to the first photoelectric signal so as to generate a plurality of second photoelectric signals. The plurality of first optical fiber networks are configured to transmit the plurality of second photoelectric signals. The plurality of remote antenna devices are configured to receive and perform an optical-electrical conversion to the plurality of second photoelectric signals so as to generate a plurality of third photoelectric signals.

Abstract: An optical buffer unit includes a plurality of delay line units each of which gives a delay to optical signals, and a switch that receives an optical signal output from one of the delay line units, includes a first output for outputting the optical signal to a next one of the delay line units and a second output for outputting the optical signal to another apparatus, and outputs the optical signal from the first output or the second output.

Abstract: A laser light source includes an inner ring and an outer ring. The inner ring includes a semiconductor optical amplifier (SOA), a pair of optical circulators, a first optical filter, and a first optical waveguide connecting those in series. The outer ring includes the SOA, a pair of optical circulators, a second optical filter, an output port, and a second optical waveguide connecting those in series except for a portion shared. The inner ring operates as a gain-clamped SOA with a feedback control light defined by the first optical filter. The outer ring generates a laser output in a gain region of the clamped SOA, and with multiple peak wavelengths defined by the second optical filter, in a range from L Band to U band, applicable to WDM network systems. A WDM network system and a method of controlling the laser light source are also disclosed.