Abstract: The present invention discloses an apparatus, comprising means for: determining a rate for a received signal in a passive optical network, PON; selecting, based on the determined rate, a set of coefficients for an equalizer from a plurality of predetermined sets of coefficients for the equalizer, wherein, the plurality of predetermined sets respectively corresponds to a plurality of rates; equalizing the received signal with the equalizer based on the selected set of coefficients, obtaining an equalized signal.

Abstract: An apparatus includes a plurality of demultiplexing modules, a plurality of multiplexing modules, and a plurality of N×N switching modules. Each demultiplexing module is connected to P N×N switching modules through optical fibers. Each multiplexing module is connected to P N×N switching modules through optical fibers. Demultiplexing modules and multiplexing modules are connected to same N×N switching modules. At least one N×N switching module connected to a target demultiplexing module has a function of switching optical signals of a plurality of wavelengths for the target demultiplexing module. A quantity of wavelengths of optical signals received by each N×N switching module connected to the target demultiplexing module from the target demultiplexing module is less than a target value, and the target value is a quantity of wavelengths of optical signals received by the target demultiplexing module.

Abstract: A signal intensity flattening method includes: classifying a plurality of user devices accommodated in the same relay node so that user devices with similar optical signal intensities are in the same class; and setting a signal transmission path for converging optical signals transmitted from user devices of the same class in the same optical transmission line, and adjusting the signal intensities of the optical signals converged in the same optical transmission line collectively without separating them for each wavelength.

Abstract: A control device including a collection unit that acquires, at a predetermined cycle, cooperation information, which is information indicating a communication state between a communication system that includes a wireless station including an antenna and an allocation device that allocates a wavelength, and a terminal to be communicated, an analysis unit that analyzes the communication state in the communication system on the basis of the cooperation information, and an allocation control unit that controls execution of wavelength allocation by the allocation device on the basis of an analysis result of the analysis unit.

Abstract: An optical transceiver includes a printed circuit board (PCB) with an edge; one or more first components associated with a transmitter functionality of the optical transceiver, the one or more first components including a linear driver component and a processing component; one or more second components associated with a receiver functionality of the optical transceiver, the one or more second components including a linear transimpedance amplifier (TIA) component; electrical contacts arranged at the edge of the PCB; first electrical traces, connected between the one or more first components and the electrical contacts; and second electrical traces, connected between the one or more second components and the electrical contacts. The one or more first components are closer to the electrical contacts than the one or more second components.

Abstract: Provided is an operation method of a coherent optical reception system. The operation method includes the following configurations. A coherent optical receiver configured to receive light from at least two light sources; a local oscillator (LO) configured to transmit first LO light to the coherent optical receiver, and a polarization controller configured to transmit a signal for polarization control to the LO, wherein the polarization controller is configured to transmit a first control signal to the LO on the basis of a first reception signal, and the LO is configured to transmit second LO light to the coherent optical receiver on the basis of the first control signal.

Abstract: In a communication satellite system (10), communication satellites (20) that fly on respective orbital planes such as an orbit (A), an orbit (B), and an orbit (C) each include a fore-aft communication device for communicating with other communication satellites (20) flying in front of and behind that communication satellite (20). Each of the communication satellites (20) flying in each orbit forms cross-link communication with communication satellites (20) in adjacent orbits at the northern edge of the orbit, indicated by a range (72), and the southern edge of the orbit, indicated by a range (73), using the fore-aft communication device. Thus, communication between orbits becomes possible only with the fore-aft communication device.

Abstract: A device (10) for interleaving data blocks for an optical communications system between a satellite and an earth station. The interleaving device (10) includes a control module (11), a cache memory (15) and an external memory (12). The cache memory (15) includes buffer areas (16). The control module (11) is configured to write each new frame of blocks (21) received in an available buffer area (16), to form (102) groups (22) of interleaved blocks from different blocks (21) belonging to different frames (20) stored in different buffer areas (16), and to write (103) each group (22) of interleaved blocks thus formed in a sequential area (13b) of the external memory (12).

Abstract: A circuit apparatus for calibrating an unequal-arm interferometer, and a quantum communication device are provided. The circuit apparatus includes: a constant-voltage power supply; a heater, provided on a short arm of the unequal-arm interferometer; and a diode, reversely connected between a positive electrode and a negative electrode of output ends of the constant-voltage power supply, and connected in series with the heater, wherein the diode provides a corresponding reverse saturation current to the heater according to a change in ambient temperature, so as to counteract an excess amount of an optical path change on a long arm of the unequal-arm interferometer under the effect of the change in the ambient temperature, relative to an optical path change on the short arm of the unequal-arm interferometer under the effect of the change in the ambient temperature.

Abstract: A system for passive optical network (PON) communication includes an optical line terminal (OLT) comprising a multi-PON transceiver configurable to communicate in accordance with a first PON protocol and in accordance with a second PON protocol on a same fiber optical link, wherein, in a first configuration, the multi-PON transceiver is configured to activate communication using the first PON protocol on the fiber optical link, and deactivate communication using the second PON protocol on the fiber optical link, and wherein, in a second configuration, the multi-PON transceiver is configured to activate communication using the first PON protocol on the fiber optical link, and activate communication using the second PON protocol on the fiber optical link.

Abstract: Implementations for remotely managing an optical transceiver connected to a network device and optical network is described. A user can use a network device controller and optical transceiver controller in a remote server to communicate with the service agent in the network device and the optical transceiver to configure communications with the optical network through the optical transceiver. The service agent and its controller in the server can perform virtualized transport functions and the network device controller and the network device can, in some instances, implement layer 2/3 demarc.

Abstract: Example embodiments describe an optical line terminal, OLT, configured to communicate in a passive optical network with one or more optical network units, ONUs. Optical burst signals transmitted by the one or more ONUs have respective symbol rates. The optical line terminal includes a burst-mode receiver configured to decode an optical burst signal from an ONU to a decoded output signal by one or more digital signal processing circuitries that process a signal at respective configurable processing rates. The optical line terminal is configured to perform obtaining the symbol rate of a next optical burst signal; and adjusting, during an interval between reception of valuable symbols within a previous optical burst signal and reception of valuable symbols within the next optical burst signal, the configurable processing rate of one or more digital signal processing circuitries based on the symbol rate of the next optical burst signal.

Abstract: There is provided a technique for implementing instantly responsive communication flexibly by setting communication occasions in an on-demand manner that are not included in a communication plan scheduled in advance for inter-satellite optical communication. One aspect of the present disclosure relates to a satellite including an optical signal obtainer that captures an optical beacon transmitted from a relay satellite in response to a communication request received from an earth station, an image processor that retrieves a bright spot in a captured image frame, an optical beacon detector that detects the optical beacon based on a flickering state of the retrieved bright spot, and an optical communicator that establishes inter-satellite optical communication with the relay satellite based on the detected optical beacon.

Abstract: A multiplicative analog frequency transform optical neural network (MAFT-ONN) encodes data in the frequency domain, achieves matrix-vector products in a single shot using photoelectric multiplication, and uses a single electro-optic modulator for the nonlinear activation of all neurons in each layer. Photoelectric multiplication between radio frequency (RF)-encoded optical frequency combs allows single-shot matrix-vector multiplication and nonlinear activation, leading to high throughput and ultra-low latency. This frequency-encoding scheme can be implemented with several neurons per hardware spatial mode and allows for an arbitrary number of layers to be cascaded in the analog domain. For example, a three-layer DNN can compute over four million fully analog operations and implement both a convolutional and fully connected layer.

Abstract: An optical ranging system includes a coherent IQ receiver configured to receive a radio frequency (RF)-encoded optical signal, generate an in-phase (I) electrical signal and a quadrature (Q) electrical signal based on the RF-encoded optical signal; a first analog-to-digital converter (ADC) configured to convert the I electrical signal into an I digital signal; a second ADC configured to convert the Q electrical signal into a Q digital; and a processing circuit configured to generate a power signal having the target frequency by squaring the I digital signal and the Q digital signal, and summing a squared I digital signal and a squared Q digital signal. The processing circuit is configured to analyze the power signal to determine a signal phase corresponding to signal peaks associated with the target frequency, and determine a distance value based on a phase difference between the signal phase and a reference power signal.

Abstract: A system may include a solar cell and a modulator connected to an output of the solar cell. The system may receive a signal. When the signal being in a first state corresponding to modulation, the modulator may modulate voltage output of the solar cell and cause the solar cell to perform optical transmission. When the signal is in a second state corresponding to energy harvesting, the modulator to cease modulation of the output of the solar cell.

Abstract: A shared OTDR resource is disclosed that utilizes a combination of a pluggable OTDR and incorporated 1×N optical switch to allow for OTDR measurement and monitoring functionality to be shared between a plurality of N separate optical fibers that are used as communication paths between a pair of optical nodes (for example, a plurality of individual fiber spans used to interconnect a pair of data centers). The capability to maintain the OTDR functionality within a small form factor pluggable housing (e.g., QSFP, OSFP, or the like) in combination with the switch results in a shared OTDR resource that remains pluggable, and allows for increased flexibility in how this resource is shared among the various fibers.

Abstract: Described herein are packages and techniques aimed at stabilizing the wavelengths of emission of a wavelength division multiplexing (WDM) optical source against temperature fluctuations. An optical source is coupled with a feedback loop that monitors the degree to which the wavelengths of emission conform to the designated WDM channel grid and dynamically adjusts the operating parameters of the source to maintain such conformity. The technique involves a combination of coarse spectral alignment and fine spectral alignment. An optical source uses a pair of thermo-electric coolers (TEC) to aid in the spectral alignment process. A first TEC is thermally coupled to a laser chip. A second TEC is thermally coupled to a multiplexer chip—a chip that monitors compliance of the emission wavelengths with the designated WDM grid.

Abstract: The Electromagnetic Materials Identification Tool (EMIT) is a handheld-tool for laboratory, industrial, or field use, via portable devices or integrated systems. EMIT establishes a new EM wave-state category in the Periodic Table of Elements, identifying materials as structured spatial wave-state expressions that preserve particle spin, position, superposition, and spatial relationships. Signatures are viewed/stored as Electromagnetic Holograms (EmH) on Resonant Encoded Memory (REM). EMIT comprises a Quantum Transceiver Antenna (QTA) and coupled Transceiver Discriminator (TD). The QTA detects and synthesizes multidimensional EmH-signatures of elements, gemstones, minerals, synthetics and organics, by volume, concentration, and/or purity, for real-time identification and material transformation. AI enhances signature analysis, anomaly detection, and enhanced resolution. EMIT integrates with NMR, MRI, X-ray, Ultra-sound, microscope and telescope systems.

Abstract: An estimation apparatus includes: an acquiring unit that acquires performance information corresponding to the performance of light from nodes configuring an optical network; and an estimating unit that compares the performance information to be an estimation target acquired by the acquiring unit with performance information at normal time at which no anomaly occurs, and performs at least one of estimation of anomaly occurrence and identification of an anomaly occurring node.