Abstract: Disclosed is a method that includes receiving, at a scheduling server, a request for a first particle of a pair of quantum entangled particles and a second particle of the pair of quantum entangled particles, evaluating the request based on one or more parameters to yield a schedule and communicating instructions from the scheduling server to an entangled particle production system to deliver, according to the schedule, the first particle to a first node and to deliver the second particle to a second node according to the request. In this manner, respective particles of a quantum entangled pair can be delivered to the appropriate nodes for use in a communication.

Abstract: The present invention provides a wireless optical communication data transmission apparatus and method, including a transmit module and a receive module, where the transmit module includes a transmission gate, and the transmit module is configured to convert serial data into multipath control signals to control the transmission gate to output an electrical signal, convert the electrical signal into an optical signal, and transmit the optical signal to the receive module; and the receive module includes a peak value detector and a comparator group, and the receive module is configured to convert the received optical signal into the electrical signal and output the serial data after threshold determination by the comparator group, where the peak value detector provides a reference voltage to the comparator group according to the received electrical signal, and the comparator group performs voltage division according to the reference voltage to determine a threshold.

Abstract: A method of modulating an optical camera communication (OCC) signal by an OCC transmission node in an OCC system includes acquiring a binary data signal, grouping the binary data signal for every k bits to convert the binary data signal into a global phase shift signal having an integer value from 0 to M?1 (=2k?1), generating a data signal group by mapping the global phase shift signal to first to Mth mapping sequences in the form of an n*M/2-bit sequence based on a preset symbol group mapping table, generating a pulse wave signal by modulating the data signal group, and blinking each of a plurality of light sources included in the OCC transmission node according to the pulse wave signal. Accordingly, performance of the communication system may be improved.

Abstract: The invention relates to a communication device comprising a docking station and a central processing unit. The docking station comprises a plurality of photoreceptors and a plurality of light sources interjacent with the photoreceptors. The plurality of photoreceptors and the plurality of light sources are suitable for visible light communication (VLC). The central processing unit is configured for obtaining an initialization signal, selecting a portion of the plurality of light sources of the docking station, ordering an emission of a pairing signal, obtaining a response signal, and ordering a pairing of the terminal with a portion of the plurality of photoreceptors of the docking station and with a portion of the plurality of light sources of the docking station.

Abstract: An object of the present invention is to provide an optical communication system and an optical communication method capable of achieving a long transmission distance with a passive element and obtaining redundancy of a ring topology. The optical communication system according to the present invention is a PON system having a ring configuration, in which an unequal branch optical splitter having a left-right symmetrical configuration is disposed in a trunk fiber wired in a loop shape. An OLT and an ONU have a configuration in which two sets of Tx (transmitter) and Rx (receiver) are mounted. Two sets of Tx (transmitters) and Rx (receivers) in each of a plurality of ONUs are respectively connected to left and right symmetrical ports of one unequally branched light beam SP.

Abstract: A powered device includes a plurality of photoelectric conversion elements. The photoelectric conversion elements receive feed light. The photoelectric conversion elements are disposed such that light-receiving surfaces of the photoelectric conversion elements are arranged in a concave shape.

Abstract: A tunable laser based light source for Li-Fi communication comprising a laser (1), a first optical element (3), and a second optical element (4). The first optical element (3) is configured to reflect and/or refract a scanning beam (2) emitted from the laser (1). The second optical element (4) is configured to broaden the scanning beam (2) reflected/refracted by the first optical element (3). The scanning beam (2) is configured to scan a scanning area extending with a first scanning length in a broadening direction (SI) and a second scanning length in a scanning direction (S2). The second optical element (4) is configured to broaden the scanning beam (2) in the broadening direction (S1) to a width larger than the first scanning length, and the laser (1) and the first optical element (3) are configured to cooperate to enable the scanning beam (2) to be swept along the scanning direction (S2).

Abstract: An optical reception device includes: a light receiving element; an amplifier which receives and amplifies a current based on an input current from the light receiving element; a direct-current adjustment circuit which removes an offset current included in the input current; an alternating-current adjustment circuit which causes a part of the input current to flow therein; and a controller which controls the direct-current adjustment circuit and the alternating-current adjustment circuit. The controller includes an integrator configured to integrate an output of the amplifier and output a resultant output to two electric paths of a positive phase and a negative phase, and an inversion suppression circuit configured to operate so as to inject a current to the positive phase and extract a current from the negative phase when a negative phase potential of an output of the integrator is higher than a positive phase potential thereof.

Abstract: A variable optical BPF allows a signal light of a specified wavelength band in a signal light including reference signal lights to pass through. A light receiving unit outputs a level signal indicating a level of the signal light having passed through the variable optical BPF. A control unit refers to a wavelength table held in advance, instructs a wavelength band that passes through the variable optical BPF, and obtains a spectrum of the signal light having passed through the variable optical BPF using the wavelength table and the level signal. The control unit detects a wavelength drift between a center wavelength of the wavelength band instructed to the variable optical BPF to cause the reference signal lights to pass through and center wavelengths of peaks corresponding to the reference signal lights in the spectrum, and updates the wavelength table to corrects the detected wavelength drift.

Abstract: Consistent with the present disclosure, a photonic integrated circuit (PIC) is provided that has 2 N channels (N being an integer). The PIC is optically coupled to N optical fibers, such that each of N polarization multiplexed optical signals are transmitted over a respective one of the N optical fibers. In another example, each of the N optical fibers supply a respective one of N polarization multiplexed optical signals to the PIC for coherent detection and processing. A multiplexer and demultiplexer may be omitted from the PIC, such that the optical signals are not combined on the PIC. As a result, the transmitted and received optical signals incur less loss and amplified spontaneous emission (ASE) noise. In addition, optical taps may be more readily employed on the PIC to measure outputs of the lasers, such as widely tunable lasers (WTLs), without crossing waveguides.

Abstract: Provided are methods for optical communication, comprising: generating a phase difference signal with heterodyne or homodyne phase-locked-loop (PLL) from between an optical input signal and a local laser source; controlling the local laser source with the phase difference signal; demodulating the optical input signal using the local laser source as a carrier signal to generate a baseband output signal; and controlling the heterodyne or homodyne PLL and the demodulation with an electrical oscillator signal. Also provided are related methods.

Abstract: The present disclosure has an object of proposing a method and a device for estimating the state of a transmission path or an optical transmitter capable of mechanically estimating a factor causing an error with a small amount of constellation data and a low computing amount.

Abstract: A passive optical network system having a node that is optically coupled to optical line terminals (OLTs), and that is optically coupled to optical network units (ONUs). The node includes at least one fiber link module (FLM), each FLM including an upstream multiplex conversion device (MCD), and a downstream MCD. The upstream MCD receives an upstream optical signal from the ONUs, converts the upstream optical signal to an upstream electrical signal, and transmits a regenerated upstream optical signal to the OLTs. The downstream MCD receives a downstream optical signal from the OLTs, converts the downstream optical signal to a downstream electrical signal, and transmits a regenerated downstream optical signal to the ONUs.

Abstract: An upstream (US) optical line terminal (OLT) for a passive optical network having at least one downstream (DS) optical network unit (ONU). The OLT generates a trigger signal indicating a need to receive at least one US burst having a shortened codeword for a first forward error-correction (FEC) code. Based on the trigger signal, the OLT transmits a DS message instructing the ONU to transmit an US burst having a shortened codeword. The OLT receives and decodes the US burst having the shortened codeword using the first FEC code. During periods of high bit-error rate, the shortened codewords increase the ability of the OLT to decode the US bursts and keep communications from the ONU alive. The OLT can use the decoded US bursts to measure BER and, if appropriate, instruct the ONU to use a different FEC code.

Abstract: Disclosed are apparatuses and testing methods for emulating an Optical Network Terminal (ONT) device for communicating or otherwise working with an Optical Line Terminal (OLT) device that was configured to operate with the ONT device. Such emulation may include configuring various settings of the apparatus so that the apparatus may appear to the OLT to be the ONT device. For example, the emulation may include accessing and using authentication/authorization related settings and network configuration settings of the ONT, thus permitting the apparatus to connect to a Passive Optical Network and test services and the quality of service experience without having to reconfigure the OLT.

Abstract: An optical device may include a dispersion element. The optical device may include a reflective optic to reflect an optical beam with a fixed offset perpendicular to a dispersion direction of the dispersion element and with a negative offset in the dispersion direction of the dispersion element. The reflective optic may be aligned to the dispersion element to offset an optical beam with respect to the dispersion element and to cause the optical beam to pass through the dispersion element on a plurality of passes, offsetting the optical beam on each of the plurality of passes.

Abstract: Disclosed herein are methods, devices, and systems for providing timing and bandwidth management of ultra-wideband, wireless data channels (including radio frequency and wireless optical data channels). According to one embodiment, a hub apparatus is disclosed for providing out-of-band bandwidth management for a free-space-optical (FSO) data channel associated with a first device. The hub apparatus includes a processor, a memory coupled with the processor, an FSO transmitter coupled with the processor, and an FSO receiver coupled with the processor. The FSO transmitter may be configured to transmit a control signal comprising timing information and bandwidth management information.

Abstract: Consistent with the present disclosure, an encoder circuit is provided at a transmit side of an optical fiber link that maps an input sequence of bits of fixed length k a sequence of symbols of a codeword of length n, such that the symbols of the codeword define a predetermined transmission probability distribution. Preferably, each symbol of the codeword is generated during a corresponding clock cycle, such that after n clock cycles, a complete codeword corresponding to the input bit sequence is output. On a receive end of the link, a decoder is provided that outputs the k-bit sequence every n clock cycles. Accordingly, buffers need not be provided at the output of the encoder and the input of the decoder, such that processing of the input sequence, codewords, and output sequence may be achieved efficiently without large buffers and complicated circuitry. Moreover, the input sequence, with any binary alphabet may be matched to a desired output distribution with any arbitrary alphabet.

Abstract: A network node in an optical network dynamically generates a routing table based on attributes of the optical network. The network node obtains attributes characterizing the optical network, which includes multiple network nodes connected by optical links. The network node calculates cost values for sending data from the network node to one or more next hop nodes that are connected to the network node. Each particular cost value is associated with a probability of success of sending the data to a particular next hop node based on a particular permutation of the attributes characterizing the optical network. The network node generates a routing table correlating the permutations of the attributes with each next hop node based on the cost values.

Abstract: Provided are a method and apparatus for transmitting configuration information, a storage medium and a system. The method for transmitting configuration information includes: mapping a client signal into a predetermined container corresponding to the client signal; encoding configuration information of the predetermined container according to a predetermined format; and sending the optical transport network frame that carries the predetermined container and the encoded configuration information of the predetermined container in the payload area.