Abstract: A carrier office includes an optical line terminal, a first transmit-erbium-doped fiber amplifier (EDFA), and a second transmit-EDFA. The OLT is configured to transmit first and second optical signals. The first transmit-EDFA is optically coupled to the OLT and a first feeder fiber, and the first feeder fiber is optically coupled to a first remote node (RN). The first transmit-EDFA is operable between a respective enabled state and a respective disabled state. The second transmit-EDFA is optically coupled to the OLT and a second feeder fiber, and the second feeder fiber is optically coupled to a second RN. The second transmit-EDFA is operable between a respective enabled state and a respective disabled state.

Abstract: In an adaptation module relating generally to adaptive optical channel compensation, an analysis module is coupled to receive a first data signal and a second data signal and coupled to provide first information and second information. A comparison module is coupled to compare the first information and the second information to provide third information. An adjustment module is coupled to receive the third information to provide fourth information to compensate for distortion in the second data signal with reference to the first data signal. The second data signal is associated with a conversion of the first data signal to an optical signal for communication via an optical channel.

Abstract: An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for.

Abstract: Optical systems and methods for transmission of multiple beams and direct detection of those beams are described. One transmitter for use in a free space optical communication system includes a broad spectrum light source and an optical component including a plurality of sections positioned to receive an optical beam produced by the broad spectrum light source. The sections of the optical component are formed to introduce optical path differences into portions of the optical beam that impinge on the optical component such that each section introduces a delay into a corresponding portion of the optical beam. The introduced delays cause each portion of the optical beam to lack coherence with other portions of the optical beam. A direct detection receiver detects the intensity of the aggregate beams and produces a signal with improved signal-to-noise ratio. The disclosed technology can be used with modulated optical beams such as intensity modulated beams.

Abstract: An optical network has an optical line termination coupled to a backbone network, in particular to an optical long haul network and a local exchange coupled to an optical access network. The local exchange provides an optical connection between an optical network unit of a tree topology and the optical line termination, which is part of a ring topology. There is also described a method for processing data in such an optical network.

Abstract: The present disclosure discloses a method for training time slot synchronization of nodes in an Optical Burst Transport Network (OBTN), a node device and a network. The method includes that: a node trains a reference time delay between receiving of a control frame and receiving of a data frame, wherein the data frame and the control frame are within one period; and the node trains a sending time slot between sending of adjacent data packets in the data frame.

Abstract: Assemblies include a micronode having an optical connector, a coaxial connector port and a housing that includes a plurality of mounting bores. The assembly further includes a filter having a housing that underlies the micronode housing, the filter housing including a plurality of mounting bores, the mounting bores of the filter housing aligning with the mounting bores of the micronode housing. The filter further includes a first optical connector configured to receive an optical drop cable, a second optical connector configured to receive an optical cable and an optical pigtail cord that is connected to the optical connector of the micronode.

Abstract: In an optical communication system having flexible transceivers, a transmitter section of one of the flexible transceivers generates a modulated pilot signal whose amplitude or phase or both have been modulated according to a digital code. An optical signal is transmitted from the transmitter section to a receiver section of another of the flexible transceivers. The optical signal conveys data and the modulated pilot signal. The digital code encodes parameter information for the transmitter section and for the receiver section. The receiver section receives the modulated pilot signal, determines the digital code by demodulating the modulated pilot signal, and determines the parameter information from the digital code. The transmitter section and the receiver section adjust their configuration according to the parameter information. The receiver section, while configured according to the parameter information, processes received data or future received data.

Abstract: The invention provides a communication system (500), a lighting system, a method of transmitting information and a computer program product. The communication system according to the invention is configured for transmitting data via visible light. The communication system comprises a signal generator (530) for generating a light driving signal (200) being a frequency shift key modulated signal comprising a sequence of signal parts (215, 225), each signal part being modulated at a first or second frequency in accordance with the data, the signal parts modulated at the first frequency having first pulses in first periods (T0) and the signal parts modulated at the second frequency having second pulses in second periods (T1). Energy of the visible light corresponding to a pulse in a respective period has center of gravity in time.

Abstract: In some embodiments, an apparatus includes a first optical transceiver. The first optical transceiver includes a set of optical transmitters, an optical multiplexer operatively coupled to the set of optical transmitters, and a variable optical attenuator operatively coupled to the optical multiplexer. The variable optical attenuator is configured to receive a control signal from a controller of the first optical transceiver and modulate a signal representing control information with an output from the optical multiplexer. The control information is associated with the control signal and for a second optical transceiver operatively coupled to the first optical transceiver.

Abstract: Provided are methods and systems for receiving and processing optical signals. A dual single side band (SSB) modulation scheme is utilized to take advantage of a given wavelengths' bandwidth. Modulation schemes are employed that modulate each SSB with their In-phase (I) and Quadrature (Q) components. The methods and systems discussed utilize an adaptive equalizer and an LMS algorithm to remove imaging components of the left and right SSBs provided by the modulators. The adaptive equalizer and the LMS algorithm also compensate for linear and nonlinear distortions. Various algorithms can be employed, including but not limited to, algorithms for updating crosstalk coefficients in the equalizer, where the cross talk coefficients are induced from the imaging from the modulation of the dual SSB signal, and for updating coefficients relating to linear and nonlinear distortion.

Abstract: An optically-addressable optical switch is disclosed. The optically-addressable optical switch receives, using an optical input, a first optical signal or portion of an optical signal and determines, based on the received optical signal, an address of an optical connector. The address is one of a plurality of addresses respectively corresponding to a plurality of optical connections of the optical switch. The optical switch subsequently receives a second optical signal or portion of an optical signal, using the same optical input, and outputs the second optical signal or portion of the optical signal to the optical connection corresponding to the determined address.

Abstract: A light fixture includes an array of light-emitting elements for generating light from the light fixture, and the array of light-emitting elements includes a defined sub-array of light-emitting elements. An alternate array of light-emitting elements is coupled in parallel with the defined sub-array of alternate light-emitting elements of the light emitter. Each of the sub-array and the alternate array are coupled with a respective switch element. A control circuit is coupled with the switch elements and configured for selectively switching power between the sub-array and the alternate array for modulating the operation of the sub-array and alternate array of light-emitting elements to generate modulated communication signals.

Abstract: According to some embodiments, a network architecture is disclosed. The network architecture includes a plurality of processing network nodes. The network architecture further includes at least one broadcasting medium to interconnect the plurality of processing network nodes where the broadcasting medium includes an integrated waveguide. The network architecture also includes a broadcast and weight protocol configured to perform wavelength division multiplexing such that multiple wavelengths coexist in the integrated waveguide available to all nodes of the plurality of processing network nodes.

Abstract: The present invention provides a simple means of demodulating optical signals, e.g. wideband M-ary orthogonal. The demodulator comprises an optical processor and a comparison module. The optical processor transforms M input optical signals into 2 log2(M) intermediary optical signals and the comparison module determines the logical representation of the input data based on log2(M) binary comparisons of the optical power of the intermediary signals. Example embodiments may be reconfigurable to receive optical signals using M-FSK, M-PPM, M-PolSK, and hybrid M-ary orthogonal modulation formats. Example embodiments also offer small size, weight and power consumption for both free-space and fiber optic environments as well as improved receiver sensitivity and reduced electron bandwidth requirements.

Abstract: A microwave-frequency source at frequency fM comprises: a dual optical-frequency reference source, an electro-optic sideband generator, an optical bandpass filter, an optical detector, a reference oscillator, an electrical circuit, and a voltage-controlled oscillator (VCO). The sideband generator modulates dual optical reference signals at v2 and v1 to generate sideband signals at v1±n1fM and v2±n2fM. The bandpass filter transmits sideband signals at v1+N1fM and v2?N2fM. The optical detector generates a beat note at (v2?N2fM)?(v1+N1fM). The beat note and a reference oscillator signal are processed by the circuit to generate a loop-filtered error signal to input to the VCO. Output of the VCO at fM drives the sideband generator and forms the microwave-frequency output signal. The resultant frequency division results in reduced phase noise on the microwave-frequency signal.

Abstract: A transceiving system includes: a transmitter; and a receiver coupled to the transmitter via optical transmission lines, the transmitter includes: a first processor configured to generate division data obtained by dividing data; a modulator configured to modulate wavelengths of transport lights, which transport the division data, based on setting information including a correspondence relationship between identification information identifying each of the optical transmission lines and wavelength information indicating a wavelength, and output lights, each of which is superimposed with the respective division data, to the optical transmission lines; and a second processor configured to transmit changed setting information, which is obtained by changing the setting information, to the receiver, and the receiver includes: a de-multiplexer configured to separate lights from the optical transmission lines into de-multiplexed lights of a wavelengths, based on the changed setting information; and a third processor

Abstract: Provided are methods and systems for receiving and processing optical signals are provided. A dual single side band (SSB) modulation scheme is utilized to take advantage of given wavelengths' bandwidth. Modulation schemes are employed that modulate each SSB with their In-phase (I) and Quadrature (Q) components. The methods and systems discussed perform MIMO de-multiplexing algorithms to remove any imaging components of the left and right SSBs provided by the modulators. Various algorithms can be employed, including but not limited to inserting time interleaved training sequences into the channels of the right and left SSB signals or by employing a constant-modulus-algorithm (CMA) de-multiplexing.

Abstract: A network tap with battery assisted and programmable failover is disclosed. The network tap includes a processing element, at least one optical-electrical transceiver, and at least one multiplexer/demultiplexer module. A backup battery provides power to the optical-electrical transceiver(s) and the multiplexer/demultiplexer module(s) but not the processing element when operating in a failover mode. The network tap is programmable to operate in a fail open mode in which traffic received from the network passes through the network tap during failover or a fail closed mode in which traffic receive from the network is blocked during failover.

Abstract: Systems and methods described herein include methods and systems for controlling bias voltage provided to an optical modulating device. The optical modulating device is biased at a bias point that is different from a null point of the device such that an offset to the received optical power due to limited extinction ratio is reduced.