Abstract: A method for digital resampling in a digital communications receiver is described. The method comprises selecting whole samples of a received input signal in the time domain and implementing sub-sample digital interpolation in the frequency domain. This amounts to performing the time shift of the interpolation process in the frequency domain. The method may be performed in conjunction with the operation of a polarisation recovery filter. A digital communications receiver is also provided the receiver being arranged to perform frequency domain sub-sample interpolation on an input data signal.

Abstract: A hybrid electrical/optical data/power cabling system includes a pair of cable connectors and an elongated cable base extending between the cable connectors. A first hybrid electrical/optical data/power wire extends through the elongated cable base and is connected to each of the cable connectors. A first power transmission layer in the first hybrid electrical/optical data/power wire is configured to transmit power between the cable connectors, and a first optical data signal transmission layer included in the first hybrid electrical/optical data/power wire is configured to transmit optical data signals between the cable connectors. In some examples, the first power transmission layer may include a tubular cylindrical power transmission layer, and the first optical data signal transmission layer may include a tubular optical data signal transmission layer that is positioned within the tubular cylindrical power transmission layer.

Abstract: A method, equipment, and operation management system for detecting and authenticating a terminal in a passive optical network are provided. The method includes the following steps. The terminal has a logic registration code. A central office end receives the logic registration code sent by the terminal. The central office end judges whether the logic registration code of the terminal matches with the logic registration code stored at the central office end, and determines that the terminal is a valid terminal if the logic registration code sent by the terminal matches with the logic registration code stored at the central office end. The central office end records a terminal serial number from the valid terminal, and records a terminal identifier assigned to the valid terminal.

Abstract: A method, system, and apparatus for transmitting information over an coherent optical link comprising enabling synchronous and asynchronous data sources to be mapped together into a single payload using a generic mapping system which performs decoupling of a clock from each data source, and mapping data from each data source into a tributary of an oFrame.

Abstract: A dynamic short range free-space optical (FSO) communication system that is specially designed for use in dynamically moving targets that are within a short range of distance (e.g., 0-50 meters) is provided herein. Using specially designed transmitters and/or receivers, the dynamic short range FSO communication system may facilitate high-bandwidth communication, while allowing several line of sight alignment options that may be useful for somewhat unpredictable vehicle movement.

Abstract: Methods, systems, transceivers, and apparatus are included for clock synchronizing an optical system and multiple leaf systems. In some implementations, a transceiver includes a receiver and a transmitter. The receiver includes an optical hybrid circuit operable to receive a first modulated optical signal and local oscillator light and to supply optical mixing products based on the first modulated optical signal and the local oscillator light. A photodiode circuit operable to supply an electrical signal based on the optical mixing products. An analog-to-digital conversion circuitry operable to supply digital signals based on the electrical signal. A digital signal processor operable to generate a supply signal based on the digital signals and provide the supply signal to a reference clock circuit for generating a clock signal. The transmitter is operable to output a second modulated optical signal that includes a timing of data based on the clock signal.

Abstract: An optical receiver is provided that includes a detector array of multiple detector elements, and processing circuits coupled to the multiple detector elements. The detector array is configured to receive light from an external source, mix the light with light from a local oscillator to generate a spatial fringe across the detector array. The multiple detector elements are configured to convert respective portions of the spatial fringe incident on the multiple detector elements to corresponding electrical signals. The processing circuits are configured to process the electrical signals. This includes the processing circuits configured to sum those of the corresponding electrical signals from one or more of the multiple detectors, and subtract the sum from a second sum of those of the corresponding electrical signals from one or more other of the multiple detectors.

Abstract: Aspects of the subject disclosure may include, a system that facilitates adjusting an adjustable waveguide structure according to properties of a physical transmission medium and inducing electromagnetic waves that are guided by the adjusted waveguide structure along the physical transmission medium. Other embodiments are disclosed.

Abstract: A remaining battery capacity measuring device within a control device of a mobile apparatus measures a remaining battery capacity level of a battery. The light-emission control device, in a period separate from a transmission period for transmitting an ID, in accordance with the remaining charge amount of the battery, performs changing of a hue of light emitted by an LED, and setting no-data and a no-data period. Alternatively, the light-emission control device, in the period separate from the transmission period for transmitting the ID, in reaction to the remaining battery capacity level of the battery, changes a luminosity of the light emitted by the LED.

Abstract: An electro-optic system, the electro-optic system that may include an input port that is configured to receive a bandpass signal that conveys information; wherein the bandpass signal is a radio frequency (RF) signal; an optical carrier source that is configured to generate an optical carrier signal having an optical carrier frequency; at least one electrical bias circuit that is configured to generate at least one electrical bias signal; an electro-optic modulation circuit that is linear at the optical field; a manipulator that is configured to (a) receive the at least one electrical bias signal and the bandpass signal, (b) generate, based on the at least one electrical bias signal and the bandpass signal, at least one modulating signal; wherein the electro-optic modulation circuit is configured to modulate the optical carrier by the at least one modulating signal to provide an output optical signal that comprises at least one optical pilot tone and at least one optical sideband that conveys the information.

Abstract: An apparatus for generating a broadband single-sideband signal based on a laser diode includes a first optical coupler configured to receive an optical carrier signal to divide the optical carrier signal into signals corresponding to a plurality of paths, a hybrid coupler configured to perform Hilbert transform on a radio frequency (RF) signal, a first slave laser and a second slave laser each configured to modulate optical output powers of the divided optical carrier signals by using a Hilbert-transformed RF signal, and a second optical coupler configured to receive an optical output power-modulated optical carrier signal to output a single-sideband signal.

Abstract: An optical transmitter generates two modulated optical signals by modulating two optical carriers respectively with two binary bit sequences by on-off keying and generates an orthogonal polarization multiplexed optical signal from the two modulated optical signals. The two optical carriers respectively have peak frequency components spaced apart from each other by a predetermined frequency difference and located such that a central frequency of a WDM channel of a WDM grid falls between the peak frequency components. An optical receiver separates the orthogonal polarization multiplexed optical signal into two signals in which components of the two modulated optical signals are combined with different combination ratios, by means of a 1-input, 2-output asymmetric filter whose two optical transmittances intersect at the WDM grid and each have a free spectral range equal to or twice the channel spacing of the WDM grid, and restores the two modulated optical signals from the separated two signals using a DSP.

Abstract: To realize sampling (signal measurement) and analysis of a signal to be measured easily at low cost by capturing optical phase fluctuation even when low-speed sampling is carried out.

Abstract: An intelligent subsystem coupled with a Super System on Chip (SSoC), a radio transceiver (e.g. a 5G/higher than 5G bandwidth radio transceiver), a voice processing module/voice processing algorithm, a foldable/stretchable/holographic display, a near-field communication device, a biometric sensor, an artificial eye and an intelligent learning algorithm is disclosed. The intelligent subsystem can respond to a user's interests and/or preferences. Furthermore, the intelligent subsystem is sensor-aware or context-aware.

Abstract: An intelligent subsystem coupled with a system-on-chip (comprising a microprocessor/graphic processor), a radio transceiver, a voice processing module/voice processing algorithm, a foldable display, a near-field communication device, a biometric sensor and an intelligent learning algorithm is disclosed. The intelligent subsystem can respond to a user's interests and/or preferences. Furthermore, the intelligent subsystem is sensor-aware or context-aware.

Abstract: A hybrid electrical/optical data/power cabling system includes a cable connector, and an elongated cable base extending from the cable connector. A first hybrid electrical/optical data/power wire extends through the elongated cable base and is connected to the cable connector. The first hybrid electrical/optical data/power wire includes a first power transmission layer that is configured to transmit power through the elongated cable base, and a first optical data signal transmission layer that is configured to transmit optical data signals through the elongated cable base. An electrical/optical data signal conversation subsystem is coupled to the first hybrid electrical/optical data/power wire, and operates to receive electrical data signals, convert the electrical data signals to optical data signals, and provide the optical data signals for transmission via the first optical data signal transmission layer in the first hybrid electrical optical data/power wire and through the elongated cable base.

Abstract: A communication network includes a coherent optics transmitter, a coherent optics receiver, an optical transport medium operably coupling the coherent optics transmitter to the coherent optics receiver, and a coherent optics interface. The coherent optics interface includes a lineside interface portion, a clientside interface portion, and a control interface portion.

Abstract: If a configuration is employed in which modulation schemes used for an optical communication system can be switched depending on transmission conditions, the power consumption increases and the control becomes complex; therefore, an optical transmitter according to an exemplary aspect of the present invention includes an encoding means for encoding digital signals to be transmitted under a predetermined transmission condition over an optical carrier wave by using one of a plurality of encoding methods; an encoding control means for selecting a predetermined encoding method corresponding to the predetermined transmission condition from among the plurality of encoding methods and causing the encoding means to operate in accordance with the predetermined encoding method; a mapping means for mapping output bit signals output from the encoding means to modulation symbols; and an optical modulation means for modulating the optical carrier wave based on symbol signals output from the mapping means.

Abstract: A communications apparatus includes an entangled-photon generator for generating entangled pairs of photons including a plurality of idler photons and a corresponding plurality of signal photons. The communications apparatus includes a quantum memory for storing the plurality of idler photons. The communications apparatus includes a transmitter for transmitting the plurality of signal photons. The communications apparatus includes an optical element for selectively reflecting the plurality of signal photons to encode a reflected signal. The communications apparatus includes a receiver for detecting a plurality of incoming photons. The communications apparatus includes a correlator configured to determine the reflected signal from the plurality of incoming photons. The correlator determines an entanglement correlation between the plurality of incoming photons with the plurality of idler photons.

Abstract: A method for detecting an MPI noise problem. The method includes: receiving a first signal, where the first signal includes a service signal sent by a sending device and an MPI noise signal generated by an MPI noise generator, and the MPI noise generator is disposed between the sending device and a receiving device of the service signal; determining whether a packet loss occurs in the service signal; and when a packet loss occurs in the service signal, determining that there is an MPI noise problem in an optical fiber link between the sending device and the receiving device. Therefore, when a packet loss occurs in a service signal that passes through an optical fiber link between a transmit end and a receive end, it can be determined that there is an MPI noise problem in the optical fiber link.