Abstract: Clothing equipment having a visual light communication emitter arranged to communicate a status of the clothing equipment, includes a light emitter arranged to emit flash light which is modulated at at least one target frequency in a dedicated non-visible spectrum, the light emitter including three fixed emitting portions distant from each other by predetermined distances, so as to authenticate the status of the clothing equipment.

Abstract: To provide a light wavelength separation device and a light wavelength separation method that can be flexibly adapted for various channel intervals of a wavelength-division multiplexed (WDM) signal, a light wavelength separation circuit is provided with: an optical coupler which splits a wavelength-multiplexed optical signal in which optical signals of a plurality of channels are multiplexed; a band-pass filter which is arranged for each of output ports of the optical coupler, separates optical signals included in the wavelength-multiplexed optical signal inputted from the output ports of the optical coupler into channels of which the central frequencies are not adjacent to each other, and outputs the separated optical signals from respectively different output ports; and an optical switch which selects one of paths of the optical signals inputted from the output ports of each band-pass filter.

Abstract: Various embodiments are disclosed for processing Flex Ethernet (FlexE) communications. Embodiments include a method of configuring a first FlexE node includes the first FlexE node configuring sending of second data, by the first FlexE node to a second FlexE node, using configuration specified in first data received by the first FlexE node. Other embodiments include apparatus arranged for configuring FlexE nodes, FlexE nodes comprising such apparatus, and computer-readable media.

Abstract: Systems and methods for forming a verified secure wireless connection are disclosed. One system includes a first device with a first transceiver and a second device with a second transceiver. The second device does not include a display or any other means for providing high resolution visible light information. The system also includes a visible light signal source on the second device. The first and second devices store computer-readable instructions to initialize a secure wireless connection using the first transceiver and the second transceiver. The second device also stores computer-readable instructions to generate a visible light signal using the visible light source. The first device stores computer-readable instructions to verify the secure wireless connection using the visible light signal.

Abstract: An optical line terminal (OLT) includes: a first optical transceiver and a second optical transceiver each configured to transmit or receive at least one optical signal among an optical signal of a first standard and an optical signal of a second standard through an optical cable inserted thereinto, and convert between an optical signal and an electrical signal; a first connector configured to electrically connect an extended output terminal of an electrical signal input/output unit of the first transceiver and an extended output terminal of an electrical signal input/output unit of the second optical transceiver; and a second connector configured to selectively connect the extended output terminal and a default output terminal of the electrical signal input/output unit of the second optical transceiver.

Abstract: An optical wireless communication (OWC) transceiver apparatus comprises: at least one light transmitter configured to transmit light of a first wavelength or first range of wavelengths; driver circuitry configured to receive a data signal and to process the data signal to produce a driving signal to drive the at least one light transmitter such that the at least one light transmitter produces a modulated optical signal representative of said data signal; at least one photodetector configured to receive light of a second wavelength or second range of wavelengths and to produce a detection signal in response to the received light; receiver circuitry configured to receive and process the detection signal to produce a receiver signal; demodulation circuitry configured to perform a decoding and/or demodulation process in accordance with an OWC protocol thereby to extract data from the receiver signal; wherein the transceiver apparatus further comprises: a motion sensor configured to sense motion of at least one ob

Abstract: The present application is applied for the field of optical networking technologies, and provides an optical networking method, an optical communication device and an optical networking system, which can use natural light to realize optical networking communication between optical communication devices and can effectively prevent interference from electromagnetic signals.

Abstract: Aspects described herein include an optical apparatus comprising an input port configured to receive an optical signal comprising a plurality of wavelengths, and a plurality of output ports. Each output port is configured to output a respective wavelength of the plurality of wavelengths. The optical apparatus further comprises a first plurality of two-mode Bragg gratings in a cascaded arrangement. Each grating of the first plurality of two-mode Bragg gratings is configured to reflect a respective wavelength of the plurality of wavelengths toward a respective output port of the plurality of output ports, and transmit any remaining wavelengths of the plurality of wavelengths.

Abstract: An integrated transceiver chip comprising: a plurality of bidirectional ports; a plurality of grating couplers; a receiver having a first and a second input ports, the first input port being optically connected to a first grating coupler of the plurality of grating couplers, and the second input port being optically connected to a first bidirectional port of the plurality of bidirectional ports; and a transmitter having a first and a second input and a first and a second output ports, the first input port being optically connected to a second bidirectional port of the plurality of bidirectional ports and the second input port being optically connected to a second grating coupler, and the first output port being optically connected to a third bidirectional port of the plurality of bidirectional ports and the second output port being optically connected to a third grating coupler of the plurality of grating couplers.

Abstract: The present disclosure provide for active boost in an electrical driver via a frequency comparator, configured to determine operational characteristics of an electrical circuit connected to an optical modulator based on a frequency difference between a ring oscillator and the clock signal; an electrical driver configured to drive a phase shift of a first optical signal carried on a first arm relative to a second optical signal carried on a second arm of an optical modulator, the electrical driver comprising: a first signal pathway, connected to the first arm of the optical modulator, wherein the first signal pathway includes: an adjustable gain inverter, electrically connected to first and second nodes; a fixed gain inverter, electrically connected to the first and second nodes; an inductor electrically connected between the second node and a third node; and a non-inverting amplifier connected between the third node and the first node.

Abstract: Wavelength-based random access in an optical communications network for a wireless communications system (WCS) is disclosed. An optical network unit(s) (ONU(s)) is configured to generate a random access signal comprising an unsolicited buffer occupancy (BO) report to request uplink allocation as soon as the ONU(s) receives a non-periodic uplink data burst. The ONU(s) then sends an optical random access signal including the unsolicited BO report to an optical line terminator (OLT) based on a random access wavelength, which is so determined not to cause any interference with a downlink optical communications signal(s) and an uplink optical communications signal(s) being regularly communicated between the OLT and the ONU(s). As a result, it is possible to reduce access delay at the ONU(s) for sending the non-periodic uplink data burst without requiring frequent polling from the OLT, thus helping to reduce signaling overhead and improve throughput of the optical communications network.

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: A semiconductor optical amplifier includes: a light source part that is formed on a substrate, the substrate including a substrate surface; and an optical amplification part that amplifies propagation light propagating in a predetermined direction from the light source part and that emits the propagation light amplified in an emission direction intersecting with the substrate surface, the optical amplification part including a conductive region extending in the predetermined direction from the light source part along the substrate surface and a non-conductive region formed on a periphery of the conductive region, the conductive region including a reflection part that reflects the propagation light in a direction intersecting with the predetermined direction when viewed from a direction vertical to the substrate surface.

Abstract: A method and structure for tap centering in a coherent optical receiver device. The center of gravity (CG) of the filter coefficients can be used to evaluate a proper convergence of a time-domain adaptive equalizer. However, the computation of CG in a dual-polarization optical coherent receiver is difficult when a frequency domain (FD) adaptive equalizer is adopted. In this case, the implementation of several inverse fast-Fourier transform (IFFT) stages is required to back time domain impulse response. Here, examples of the present invention estimate CG directly from the FD equalizer taps and compensate for an error of convergence based off of the estimated CG. This estimation method and associated device architecture is able to achieve an excellent tradeoff between accuracy and complexity.

Abstract: An echo cancellation method includes steps of (a) extracting phase-distortion estimates, (b) reconstructing an echo signal, (c) generating a clean signal, and (d) producing a primary signal. Step (a) includes extracting, from a first phase signal, a plurality of phase-distortion estimates, the first phase signal having been estimated from an echo-corrupted signal received at a first coherent transceiver of a coherent optical network. Step (b) includes reconstructing an echo signal from the plurality of phase-distortion estimates and a transmitted signal transmitted by the first coherent transceiver. Step (c) includes generating a clean signal as a difference between the reconstructed echo signal and the first phase signal. Step (d) includes producing a primary signal by mapping each of a plurality of clean-phase estimates of the clean signal to one of a plurality of constellation symbols associated with a modulation scheme of the primary signal.

Abstract: In some examples, a multi-wavelength power meter may include a first coupler to separate optical signals from an optical line terminal and an optical network terminal to ascertain a reduced percentage of total power related to the optical signals. A second coupler may receive the separated optical signals, combine the separated optical signals, and output the combined optical signals to an optical fiber. A filter may be communicatively connected to the optical fiber to isolate at least one specified wavelength or wavelength range of the combined optical signals. A photodiode may be communicatively connected to the filter for power measurement of the at least one specified wavelength or wavelength range.

Abstract: A master station device is connected to a slave station device that emits a transmission signal received by light via an optical transmission path from a plurality of antenna elements.

Abstract: A semiconductor structure is provided. The semiconductor structure includes: a substrate having a cavity recessed from a top surface of the substrate toward a bottom surface of the substrate opposite to the top surface, wherein the cavity has a sidewall and a bottom surface, and the bottom surface of the cavity is substantially parallel to the top surface of the substrate; a light source structure in the cavity, and the light source structure emitting a light from a sidewall of the light source structure; and a diffractive optical element (DOE) over the top surface of the substrate; wherein the sidewall of the cavity is a sloped surface, so that when the light is incident on the sidewall, the sloped surface reflects the incident light to generate a reflected light toward the DOE. Associated semiconductor structure and manufacturing method are also disclosed.

Abstract: The present disclosure relates to a lighting and detecting module, which includes: a light source assembly configured to emit lighting light and detecting light; a light transmission component having one end connected to the light source assembly for transmitting the lighting light and the detecting light; a lighting assembly connected to the other end of the light transmission component for receiving the lighting light transmitted by the light transmission component to provide lighting; a light detection and ranging assembly connected to the other end of the light transmission component, for emitting the detecting light transmitted by the light transmission component outward, so as to detect position parameters of a surrounding object.

Abstract: A method for optical communication between first and second transceivers over a channel in a free-space medium involves receiving a binary string of uniformly distributed bits and converting them into probabilistically-shaped unipolar M-pulse amplitude modulated (M-PAM) symbols using distribution matching. The probabilistically-shaped unipolar M-PAM symbols are mapped into a binary bit stream, which are used to generate, at a forward error correction rate, parity bits. The parity bits are mapped to uniformly-distributed unipolar M-PAM parity symbols. The probabilistically-shaped unipolar M-PAM symbols and the uniformly-distributed unipolar M-PAM parity symbols are multiplexed to form a codeword that is used to modulate the intensity of a laser so as to transmit the codeword.