Abstract: An aspect of the present invention includes: an acquirer that acquires a wavelength set to a user terminal; an optical cross-connect that outputs an optical signal to at least one output destination of a plurality of output destinations; an observer that observes a wavelength of a signal output from a user terminal to the optical cross-connect or a wavelength of a signal output from the optical cross-connect to a user terminal; and a blocker that blocks communication with the user terminal, or blocks a wavelength component of an observed wavelength, in a case where a wavelength observed by the observer is different from a wavelength acquired by the acquirer.

Abstract: An aspect of the present invention includes: a multiplexer that multiplexes a signal input from a user terminal; a splitter that splits a signal addressed to a user terminal from a multiplexed signal; and a blocker of at least one of a multiplexing blocker that blocks a wavelength component other than a wavelength set to a user terminal in a signal input from a user terminal before or after multiplexing by the multiplexer is performed, or a splitting blocker that blocks a wavelength component other than a wavelength set to a user terminal in a signal addressed to a user terminal split by the splitter after or before splitting by the splitter is performed.

Abstract: An aspect of the present invention is a control system required for optical communication, the control system including: a control unit that performs communication with a plurality of terminal devices using an optical signal, a control transceiver that performs conversion between an optical signal and an electrical signal, and a control optical switch that switches a connection destination of the control transceiver, in which the control unit switches the connection destination of the control transceiver by controlling an operation of the control optical switch, and the number of control optical switches is smaller than the number of terminal devices.

Abstract: An optical communication device including: a first optical multiplexing and demultiplexing unit that splits and outputs a control signal and main signal light transmitted at different wavelengths from at least one newly connected subscriber device; an optical distribution unit that includes a plurality of first ports and a plurality of second ports, receives as input at least the main signal light split by the first optical multiplexing and demultiplexing unit from any first port of the plurality of first ports, and outputs the main signal light from any second port of the plurality of second ports; a detection unit that is included inside or outside the optical distribution unit and detects the main signal light; a subscriber device management control unit that recognizes a port of the optical distribution unit to which at least one newly connected subscriber device is connected on a basis of the main signal light detected by the detection unit; and an optical distribution control unit that controls connecti

Abstract: Provided is a method for opening an optical communication path, in which one or more optical switches include a plurality of first ports and a plurality of second ports, and a management control device switches connection such that other first ports grouped with a transmission port connected first port of the one or more optical switches connected to a transmission port of the one subscriber device are sequentially connected to one second port to which a response request signal is input, transmits the response request signal to the one second port each time the connection is switched, specifies a reception port connected first port connected to a reception port of the one subscriber device in accordance with reception of a response signal in response to the response request signal, and sets a connection relation between the ports of the one or more optical switches such that an optical signal input to the transmission port connected first port reaches an optical transmission line to which a reception port of

Abstract: An optical switch receives an input of an optical signal which has been transmitted by a first optical communication device from a first port, and outputs the optical signal from a second port connected to a first optical transmission line included in an optical route in which an optical path between the first optical communication device and a second optical communication device is set. An optical branching unit branches a part of the optical signal which has been transmitted through the first optical transmission line, and outputs the branched optical signal to a second optical transmission line. An optical transmitting and receiving apparatus includes a reception unit, a transmission unit, and a light cutoff unit. The reception unit receives an input of the optical signal which has been branched by the optical branching unit from the second optical transmission line, and acquires a signal addressed to a destination different from the second optical communication device from the input optical signal.

Abstract: The optical reception device includes: a vector sum estimation unit that estimates a vector sum of symbols in a differentially detected training signal; and a detection unit that detects a period of receipt of at least the training signal on the basis of at least either a comparison result of comparison between an absolute value of the vector sum of symbols in the differentially detected training signal and an absolute value threshold, or a comparison result of comparison between a variation of a phase of the vector sum of symbols in the differentially detected training signal and a predetermined width.

Abstract: A line concentration optical communication device that communicates with a plurality of optical communication devices by free-space optical communication includes: an optical device control unit that controls an angle of a spatial optical device in each time slot on the basis of angle information and the time slot, the angle information being information indicating an angle at which each of the optical communication devices and the spatial optical device whose angle is controllable can communicate with each other, the time slot indicating a communicable time allocated to each of the optical communication devices; and an optical communication unit that performs communication with each of the optical communication devices via the spatial optical device.

Abstract: An aspect of the present invention is a communication device including downlink distribution units that receive signals from one or more paths, the downlink distribution units being provided as many as the number of the paths, downlink coupling units that receive signals from the respective downlink distribution units and output signals to optical signal transceivers, the downlink coupling units being provided as many as the maximum number of the optical signal transceivers, and a simultaneous distribution unit that is provided between the downlink coupling units and the optical signal transceivers and is capable of simultaneously outputting signals having wavelengths input from a plurality of paths input from the downlink coupling units to the plurality of optical signal transceivers.

Abstract: An algorithm selection device that selects an algorithm to be used by a calculation unit that performs calculation in a physical layer in data communication on the basis of a use status of a resource in the calculation unit.

Abstract: An estimation device includes: an electric field estimation unit that estimates a simulation signal of an output electric field waveform at an output terminal of a transmission line by using a filter of a tap coefficient generated for each combination of a light intensity of a first input electric field waveform at an input terminal of the transmission line and a transmission distance on the basis of the first input electric field waveform and the output electric field waveform and a generated second input electric field waveform; and an error rate estimation unit that estimates an error rate of a code sequence at the output terminal of the transmission line on the basis of the simulation signal of the output electric field waveform.

Abstract: A communication system including: a main signal transmission/reception unit that transmits and receives a main signal to and from an opposing device via a communication network in which a control device is disposed; and a setting monitoring unit that monitors a related setting in which change of a setting related to the main signal transmission/reception unit is to be restricted, and performs rewriting with preset information or blocks transmission between the main signal transmission/reception unit and the control device disposed in the communication network in a case where a setting of the related setting is not a preset setting.

Abstract: An aspect of the present invention is an optical transmitter including: a first modulation unit configured to generate an optical modulated signal through intensity modulation of an optical signal; a second modulation unit configured to generate an optical modulated signal through phase/frequency modulation of the optical signal; and a modulation scheme switching unit configured to switch a modulator of the optical signal to one of the first and second modulation units. The modulation scheme switching unit switches the modulator to a modulation unit corresponding to a device of a connection destination between the first and second modulation units.

Abstract: An optical switch receives an input of an optical signal which has been transmitted by a first optical communication device from a first port, and outputs the optical signal from a second port connected to a first optical transmission line included in an optical route in which an optical path between the first optical communication device and a second optical communication device is set. An optical branching unit branches a part of the optical signal which has been transmitted through the first optical transmission line, and outputs the branched optical signal to a second optical transmission line. An optical transmitting and receiving apparatus includes a reception unit, a transmission unit, and a light cutoff unit. The reception unit receives an input of the optical signal which has been branched by the optical branching unit from the second optical transmission line, and acquires a signal addressed to a destination different from the second optical communication device from the input optical signal.

Abstract: A communication system includes an authentication unit that authenticates setting change control for changing a setting related to a control device or a main signal transmission/reception unit, and performs the setting related to the main signal transmission/reception unit according to an authentication result.

Abstract: An optical transmission system including: an optical switch that includes a plurality of ports, outputs an optical signal input from any one of the ports from a different one of the ports, and acquires transmission path information on the basis of the optical signal input to the port; a plurality of dispersion compensation units that compensate for quality of the optical signal output from the optical switch and input the optical signal with the compensated quality to the optical switch; an ? parameter measurement unit that acquires an ? parameter indicating a chirp level on the basis of the optical signal with the compensated quality; and a control unit that performs correction of the ? parameter or adjustment of a dispersion compensation amount in a case where a condition indicating that a problem that is attributable to the ? parameter has occurred is satisfied on the basis of a cumulative wavelength dispersion amount or a transmission distance obtained on the basis of the transmission path information and

Abstract: There is provided a GW device including: a main signal path control device that performs line concentration/distribution and adding/dropping on a received main signal; and a subscriber control device that is provided between the main signal path control device and a subscriber terminal and transmits and receives the main signal and a control signal to and from the subscriber terminal, in which the main signal path control device is separable from the subscriber control device.

Abstract: According to an embodiment of the present invention, a transmission device includes: a first modulation unit configured to perform intensity modulation on a control signal for performing management control of communication; a second modulation unit configured to perform phase modulation or frequency modulation on the control signal; a reception modulation scheme acquisition unit configured to acquire a modulation scheme receivable by a receiver receiving the control signal; and a modulation control unit configured to cause the first or second modulation unit to modulate the control signal in accordance with a modulation scheme acquired by the reception modulation scheme acquisition unit.

Abstract: Provided is a method for opening an optical communication path, in which one or more optical switches include a plurality of first ports and a plurality of second ports, and a management control device switches connection such that other first ports grouped with a transmission port connected first port of the one or more optical switches connected to a transmission port of the one subscriber device are sequentially connected to one second port to which a response request signal is input, transmits the response request signal to the one second port each time the connection is switched, specifies a reception port connected first port connected to a reception port of the one subscriber device in accordance with reception of a response signal in response to the response request signal, and sets a connection relation between the ports of the one or more optical switches such that an optical signal input to the transmission port connected first port reaches an optical transmission line to which a reception port of

Abstract: An aspect of the present invention includes: an authentication step of authenticating an optical terminal; a scheme setting step of setting a communication scheme to be used between the terminal and a connection destination terminal to which the terminal is connected; a wavelength setting step of setting a wavelength to be used between the terminal and the connection destination terminal; and a path setting step of setting an optical path to be used between the terminal and the connection destination terminal.