Abstract: A first optical transceiver includes a transmission signal processor that generates a multi-valued pulse amplitude modulation signal including a fixed bit pattern. The first optical transceiver includes an optical transmitter that transmits the multi-valued pulse amplitude modulation signal as an optical transmission signal. The first optical transceiver includes an optical receiver that receives an optical adjustment signal from a second optical transceiver to reproduce an adjustment signal from the optical adjustment signal. The first optical transceiver includes a first controller that controls the transmission signal processor based on a bit error rate included in the optical adjustment signal to adjust light power at each level of the optical transmission signal.

Abstract: A terminal (100) for optical communication by laser signals including a matrix image sensor used as a tracking and acquisition detector (2). The matrix image sensor is used simultaneously to check that a portion of the laser signals received by the terminal are injected into an optical fibre (1). A spectral filter element (22) is associated with the matrix image sensor to allow such a combination of functions.

Abstract: Systems and methods are provided for utilizing polarization parameters obtained from an optical network to determine vibrations in optical fibers using coherent optics equipment and machine learning techniques. A method, according to one implementation, includes the step of obtaining a time-series dataset that includes measurements of polarization characteristics of light traversing an optical fiber of an optical network. The method also includes the step of detecting vibration characteristics of the optical fiber based on the time-series dataset. In some implementations, the time-series dataset may be a multi-variate dataset and the polarization characteristics may be related to transients in a State of Polarization (SOP). The SOP, for example, may be represented by an amplitude and a phase of an electric field vector and may be defined as having one of a linear polarization, elliptical polarization, and circular polarization.

Abstract: Provided is an optical transceiver including: a receiver configured to receive an optical transmission signal including wavelength information from another optical transceiver through a multiplexer/demultiplexer connected to the receiver; and a controller configured to identify a reception wavelength for communication with the other optical transceiver and to determine a wavelength corresponding to the reception wavelength as a transmission wavelength for communication with the other optical transceiver, based on the wavelength information included in the optical transmission signal.

Abstract: An optical communications transceiver, for use in free space communication between a satellite and a ground station, includes multiple sub-apertures for receiving signal over a plurality of angles, wherein the sub-apertures are fixed. In an embodiment, the transceiver is further configured for transmitting signal over the plurality of angles without physically moving the transceiver to those angles.

Abstract: An Optical Time Domain Reflectometer (OTDR) module obtains Optical Return Loss (ORL) of a fiber plant. Calibration information is obtained of at least internal OTDR reflections associated with the OTDR module. The OTDR module is connected to the fiber plant. An ORL response is measured due to reflections of an ORL signal transmitted from the OTDR module along the fiber plant, and a peak OTDR response is measured in response to reflections of an OTDR signal transmitted from the OTDR module along the fiber plant. A corrected ORL response of the fiber plant is determined by: using the measured peak OTDR response (e.g., peak value or area under the peak) and the calibration information to calculate the calculated ORL due to internal reflections, and then adjusting the measured ORL response by the calculated ORL to represent the corrected ORL of the fiber plant.

Abstract: An operational environment is disclosed herein that includes a cryogenic environment and a signal source. The cryogenic environment includes a signal target, an optical link, signal converter devices, and an electrical link. Outside of the cryogenic environment, the signal source generates an electric signal. An electric-to-optical converter converts the electrical signal into an optical signal. The optical link delivers the optical signal into the cryogenic environment. Inside the cryogenic environment, an optical-to-electrical converter converts the optical signal back into an electrical signal. The optical-to-electrical converter transfers the electric signal to the signal target.

Abstract: A computation unit uses an assumed chromatic dispersion amount to compensate for dispersion of a coherently received optical signal and performs arithmetic of a signal power of the optical signal that is dispersion compensated. The computation unit performs computation of an evaluation function when a signal power and a delayed signal power obtained by applying a predetermined delay to the signal power satisfy a threshold condition. The evaluation function is a function for evaluating whether the assumed chromatic dispersion amount is a chromatic dispersion amount of the optical signal using the difference between the signal power and the delayed signal power. The chromatic dispersion amount calculation unit calculates a chromatic dispersion amount of the optical signal based on the computation result of the evaluation function by the computation unit when each of a plurality of different assumed chromatic dispersion amounts is used.

Abstract: An apparatus includes a first antenna, a tunable optical carrier source, a second antenna, and a delay generation module coupled to the first antenna and the tunable optical carrier source. The apparatus also includes a fixed wavelength optical carrier source, an optical carrier generation module coupled to the fixed wavelength optical carrier source, and a local oscillator generation module. The apparatus further includes a correlative kernel generation and integration module coupled to the delay generation module and the local oscillator generation module and an optoelectronic conversion module coupled to the correlative kernel generation and integration module.

Abstract: A method for monitoring leakage in an aeronautical band of a high split HFC by a detection and validation of OUDP bursts includes: providing an apparatus for use in a patrol vehicle, the apparatus including a leak signal receiver coupled to a processor; measuring a duration of detected bursts to provide a plurality of burst durations; collecting a histogram of the burst durations during a measuring session to provide a duration histogram; and determining a presence of a leak based on a comparison of the duration histogram with expected durations of OUDP bursts. Systems for monitoring leakage in an aeronautical band of a high split HFC by a detection and validation OUDP bursts, and other methods for monitoring leakage in an aeronautical band of a high split HFC by a detection and validation OUDP bursts are also described.

Abstract: A system and method for radio frequency (RF) signal processing via photonic local oscillator (LO) phase control generates a set of N optical carriers and M sets of control inputs, each control input including an amplitude and/or phase control for the nth carrier. Each nth optical carrier is split into an RF path and M LO paths, the RF path including N electro-optical (EO) modulators for amplitude/phase modulation of each nth carrier per a set of N RF input signals and each mth LO path including a set of N EO modulators for amplitude/phase modulation of each nth carrier per the mth control input. Demodulators generate M in-phase and quadrature (I/Q) balanced optical outputs based on the multiplexed N combined RF optical outputs and each mth set of N combined LO optical outputs. The M I/Q balanced optical outputs are converted to the electrical and then to the digital domain.

Abstract: Aspects of this disclosure relate to utilizing a 360-degree light source and frictionless authentication methods to provide access to a secure network and associated services. Data transmission is conducted via a light source that is also used to illuminate a location. An agent-centric method of frictionless data authentication and transfer is applied. The agent-centric authentication methods may be power efficient for use in connection with a mobile device having limited battery capacity and limited bandwidth.

Abstract: A detector coherent-receives a signal being transmitted from a transmitter. A filter group includes a plurality of filters connected in series along a signal path of a reception signal. The plurality of filters include a plurality of non-linear distortion compensation filters and one or more linear distortion compensation filters. A coefficient updating unit controls a filter coefficient of the plurality of non-linear distortion compensation filters and a filter coefficient of at least some of the linear distortion compensation filters. The coefficient updating unit adaptively controls the filter coefficient, by using an error back propagation method, based on a difference between an output signal being output from the filter group and a predetermined value of the output signal.

Abstract: Low power and/or low footprint optical communication technologies that support short to medium range exoatmospheric communications and provide bidirectional communication with nearly spherical coverage.

Abstract: The manipulation and control of entangled particle and entangled photon properties by means of low loss interaction free quantum means is vital for studying the fundamentals of entanglement and for future applications in distributed quantum information processing, sensing and imaging. Despite its importance, achieving low loss interaction free manipulation and control of entanglement is difficult, particularly with pulsed networked systems with quantum properties changing in space and time and with intervening absorbing elements. This invention uses low loss quantum interaction free techniques and designs that can be miniaturized to efficiently and robustly send and receive quantum information and data using pulsed and continuous origin temporal and polarization entangled particles and entangled photons. The invention may be used to improve quantum communication of information and quantum networking in fiber optics, turbulent and scattering media, and free space.

Abstract: A free-space optical communication system has a conversion assembly, a fiber array, and a wavelength selective switch (WSS) assembly. The conversion assembly converts circular polarization states of incoming optical signals to linear polarization states and converts linear polarization states to circular polarization states for outgoing optical signals. The fiber array has polarization-maintaining (PM) optical fibers arranged in optical communication between the conversion assembly and the WSS assembly to preserve the linear polarization states of the optical signals. The WSS assembly has free-space optics, such as dispersion element and beam-steering element, with optical axes arranged relative to the PM optical fibers. The WSS assembly selectively switches WDM channels of the optical signals relative to the PM optical fibers. Fast and slow axes of the PM optical fibers are aligned to the optical axes of the free-space optics.

Abstract: A visual light communication emitter for a vehicle, arranged to communicate a status of the vehicle, includes a first light emitter arranged to emit flash light which is modulated at a first target frequency in a dedicated non-visible spectrum, and a second light emitter arranged to emit flash light which is modulated at a second target frequency in the dedicated non-visible spectrum. A difference between the first target frequency and the second target frequency is predetermined, so as to authenticate the status of the vehicle.

Abstract: A method for processing service data in an optical transport network includes receiving service data, where the service data is to be mapped to a plurality of consecutive data frames, determining a quantity of code blocks, occupied by the service data, of each of the plurality of consecutive data frames and locations of the code blocks, where the code block includes a payload area and an overhead area, the payload area of the code block is used to carry the service data, and the overhead area of the code block includes identification information of the service data, and mapping the service data to the plurality of consecutive data frames based on the quantity of code blocks and the locations of the code blocks.

Abstract: Aspects of the present disclosure describe a three-way branching unit switch module having a small footprint suitable for application in an undersea application.

Abstract: A method for automatic power and modulation management in a communication network includes (a) generating a discontinuous management function that is a weighted function of at least spectral efficiency and power consumption of the communication network, (b) determining, from the discontinuous management function, an optimal modulation format, an optimal forward error correction (FEC) rate, and an optimal output power of a transmitter of the communication network, which collectively achieve a maximum value of the management function, and (c) causing the transmitter to operate according to the optimal modulation format, the optimal FEC rate, and the optimal output power.