Abstract: A method for controlling a passenger service unit includes receiving, by a personal device of a passenger, an electromagnetic (EM) signal. The EM signal includes identification information of the passenger service unit. The method also includes transmitting, by the personal device, a message for controlling operation of one or more selected devices of the passenger service unit. The message includes an identification of the one or more selected devices of the passenger service unit and a control input for each of the one or more selected devices.

Abstract: Aspects of the present disclosure describe systems, methods and apparatus for improving the performance of Rayleigh-based phase-OTDR with correlation-based diversity combining and bias removal.

Abstract: An optical communication network includes a downstream optical transceiver. The downstream optical transceiver includes at least one coherent optical transmitter configured to transmit a downstream coherent dual-band optical signal having a left-side band portion, a right-side band portion, and a central optical carrier disposed within a guard band between the left-side band portion and the right-side band portion. The network further includes an optical transport medium configured to carry the downstream coherent dual-band optical signal from the downstream optical transceiver. The network further includes at least one modem device operably coupled to the optical transport medium and configured to receive the downstream coherent dual-band optical signal from the optical transport medium. The at least one modem device includes a downstream coherent optical receiver, and a first slave laser injection locked to a frequency of the central optical carrier.

Abstract: An optical-communication module includes an arrayed waveguide grating; a light transmitter including light-emitting elements for emitting first signal beams into the arrayed waveguide grating, wherein the first signal beams are converged into one first communication beam in the arrayed waveguide grating; a wavelength division multiplexing filter is used to transmit the first communication beam emitted by the arrayed waveguide grating to an optical fiber; an optical receiver including optical sensor for sensing second signal beams emitted from the arrayed waveguide grating. The optical fiber is used for transmitting a second communication beam to the wavelength division multiplexing filter. The second communication light beam enters the arrayed waveguide grating through the wavelength division multiplexing filter. The second communication beam is divided into the second signal beams in the arrayed waveguide grating.

Abstract: A photonic node includes a first circuit disposed on a first substrate and a second circuit disposed on a second substrate different from the first substrate. The first circuit is configured to route light signals originated from the photonic node to local nodes of a local group in which the photonic node is a member. The second circuit is configured to route light signals received from a node of an external group in which the photonic node is not a member, to one of the local nodes.

Abstract: Methods and apparatus for maintaining transmitter-receiver alignment in a free space optical communications system without substantially moving the receiver element and with very little to no imparted momentum, while also allowing for higher tuning speeds and less system complexity than conventional solutions. The methods and apparatus allow for a large field of regard at the optical receiver, without the need for electromechanical gimbals to move the entire receiver unit and without the need for steering mirrors to move and align the incoming optical beam.

Abstract: An optical signal transceiver in a transistor outline package includes a component base, a laser device, a first wavelength division multiplexing prism and a second wavelength division multiplexing prism, a first photodetector, and a second photodetector. The component base is inside the transistor outline package and supports the laser device, the laser device emitting light to the outside of the transistor outline package. The first and second prisms and the first photodetector and the second photodetector are also located on the component base. Light output as optical signals sequentially pass through the first and second multiplexing prisms. The first input optical signal is transmitted to the first photodetector through the first prism, and the second input optical signal passes through the first prism and is passed on to the second photodetector via the second prism.

Abstract: An optical receiver including an optical resonator and a steering mechanism coupled to the at least one optical resonator is disclosed. The optical resonator is configured to receive a phase modulated input optical signal and to produce an intensity modulated output optical signal. An intensity modulation of the output optical signal is representative of the phase modulation of the input optical signal. The optical receiver further comprises an optical-electrical converter that detects the intensity modulated output optical signal and converts the intensity modulated output optical signal to an electrical signal, and signal processor that receives the electrical signal, performs symmetric phase change measurements based on the electrical signal, and provides a control signal to actuate the steering mechanism to steer the optical resonator to maintain normal incidence of the phase modulated input optical signal on a surface of at least one optical resonator.

Abstract: A system may use a single fiber combining module (SFCM) that combines multiple wavelength channels of different optical technologies over a single fiber. In an example, a SFCM may include a gigabit passive optical network (GPON) port, wherein the GPON passes signals at a first wavelength range; a XGS PON port, wherein the XGS-PON port passes signals at a second wavelength range; a dense wavelength division multiplexing (DWDM) port, wherein the DWDM port passes signals at a third wavelength range, wherein the first frequency range, the second frequency range, and the third wavelength range are different; and a common port connected with a fiber, the common port simultaneously combining signals from the GPON port, XGS-PON port, and the DWDM port.

Abstract: A transmitter maps an N-bit sequence to a point selected from a four-dimensional (4D) constellation consisting of 2N points which form a subset of a Cartesian product of first and second two-dimensional (2D) constellations, the first constellation consisting of M1 points divided into first, second, and third points, and the second constellation consisting of M2 points divided into fourth, fifth, and sixth points, wherein M1, M2?5, and wherein log2(M1×M2)>N. The subset includes any 4D point that is generated by combining any one of the M1 points and any one of the fourth points; includes any 4D point that is generated by combining any one of the first points and any one of M2 points; and excludes any 4D point that is generated by combining any third point and any sixth point. An optical signal representing the selected point is transmitted to a receiver.

Abstract: [PROBLEM TO BE SOLVED] To uninterruptedly change a band of an optical transmission path in a line IF section, which relays a signal transmitted to an optical transmission path in a client IF section to which a communication terminal is connected, to the same band as a changed band in the client IF section without suspending the communication in the line IF section. [SOLUTION] An optical transmission system 10A performs processing for changing a band of an optical fiber 15 in a line IF section (L section) that relays a signal from an optical fiber 12 in a client IF section (C section) to the same band as that in the C section.

Abstract: A vehicle line-of-sight optical communication system and method for use in ad hoc networks formed with a vehicle during traveling of the vehicle along a roadway. The communication system includes: an electronic control unit (ECU) having an electronic processor that operates under control of a program to process messages sent or received by the communication system; at least one light source that comprises a part of a vehicle external lamp module; a driver circuit electrically connected to the ECU to energize the light source(s) in response to a transmission signal from the ECU so as to send messages via the light source(s); at least one light sensor that comprises a part of the vehicle external lighting system; and a receiver circuit electrically connected to the ECU to provide the ECU with a reception signal indicative of messages received via the light sensor(s).

Abstract: An apparatus is described. The apparatus comprises a downstream wavelength selective switch having an input port, an optical path operable to carry an optical signal, an optical source providing amplified spontaneous emission (ASE) light, an optical switch having a first input coupled to the optical path, a second input coupled to the optical source and receiving the ASE light, and an output coupled to the input port of the downstream wavelength selective switch. The optical switch couples either the first input or the second input to the output. Further included is a photodiode operable to monitor the optical signal, detect an optical loss of signal of the optical signal, and output a switch signal to the optical switch such that the optical switch couples the second input receiving the ASE light to the output whereby the ASE light is directed to the input port of the downstream wavelength selective switch.

Abstract: An in-packaged multi-channel light engine is packaged for four or more sub-assemblies of optical-electrical sub-modules. Each is assembled with at least four laser chips, one or more driver chip, and one or more trans-impedance amplifier (TIA) chip separately flip-mounted on a silicon photonics interposer and is coupled to an optical interface block and an electrical interface block on a sub-module substrate. The in-packaged multi-channel light engine further includes a first frame fixture holding the four or more sub-assemblies and a second frame fixture configured to hold the first frame fixture with the four or more sub-assemblies. The in-packaged multi-channel light engine further includes an interposer plate inserted between the sub-module substrates and a module substrate and is compressed between a backplate member attached to a bottom side of the module substrate and a top plate member configured as a heatsink with a plurality of fin structures.

Abstract: Disclosed are systems, methods, and structures for DSP-free coherent receiver architectures applicable for short-reach optical links. Operationally, a received optical signal is down-converted by mixing it with a local oscillator (LO) laser signal using a 90-degree hybrid followed by balanced photodiodes. Other receiver functions are performed using analog signal processing thereby avoiding power-hungry, high-speed analog-to-digital converters and high-speed digital signal processing. Carrier phase recovery is performed by an electrical phase-locked loop employing a multiplier-free phase estimator stage that—while designed for quaternary phase-shift keying signals—may be employed in designs exhibiting higher modulation formats. Since carrier phase recovery is performed in the electrical domain, LO laser frequency modulation or LO laser integration is not employed.

Abstract: An optical communications transmitter for use in free space communication from the transmitter to a receiver, the transmitter including a light input and an optical fiber array for directing the light input. The optical communications transmitter further includes an optical phased array for receiving the light input from the optical fiber array and transmitting a light output, the optical phased array being configured for modifying a relative phase of the light input such that the light output exhibits a predetermined far-field intensity pattern.

Abstract: An optical transmission device includes a first wavelength multiplexer, a second wavelength multiplexer, a wavelength converter and a third wavelength multiplexer. The first wavelength multiplexer multiplexes optical signals in a first wavelength band to generate first wavelength multiplexed light. The second wavelength multiplexer multiplexes optical signals in the first wavelength band to generate second wavelength multiplexed light in a first polarization. The wavelength converter converts a wavelength of the second wavelength multiplexed light from the first wavelength band into a second wavelength band by a cross phase modulation among the second wavelength multiplexed light, first pump light in a second polarization and second pump light in the second polarization. The second polarization is orthogonal to the first polarization.

Abstract: An electro-optical (EO) interconnect assembly includes an optical fiber, and first and second EO transceivers. The first and second EO transceivers, which are coupled to respective ends of the optical fiber, are configured to (i) connect to respective first and second network devices, (ii) exchange electrical signals with the first and second network devices, (iii) convert between the electrical signals and optical signals, and exchange the optical signals with one another over the optical fiber, and (iv) conduct with one another, over the optical fiber, a secure challenge-response transaction, and to initiate a responsive action upon failure of the challenge-response transaction.

Abstract: A pluggable bidirectional optical amplifier module may include preamp and booster optical amplifiers and a housing. The preamp optical amplifier may be configured to amplify optical signals traveling in a first direction. The booster optical amplifier may be configured to amplify optical signals traveling in a second direction. The housing may at least partially enclose the preamp optical amplifier and the booster optical amplifier. The pluggable bidirectional optical amplifier module may have a mechanical form factor that is compliant with a pluggable communication module form factor MSA. A colorless mux/demux cable assembly may be operated with the pluggable bidirectional optical amplifier. The colorless mux/demux cable assembly may include a 1:N optical splitter a N:1 optical combiner coupled side-by-side to the 1:N optical splitter, a first fiber optic cable optic cable, and a second fiber optic cable.

Abstract: A method for controlling a passenger service unit includes transmitting, by the passenger service unit, an electromagnetic (EM) signal that is receivable by a personal device of a passenger. The EM signal includes identification information of the passenger service unit. The method also includes receiving a control message by the passenger service unit. The control message includes an identification of one or more selected devices of the passenger service unit and a control input for the selected device. The method also includes controlling operation of the one or more selected devices of the passenger service unit in response to receiving the control message and based on the control input.