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.

Abstract: Provided is an optical access system that performs communication using an optical signal on which a management control signal used for management and control is superimposed, the optical access system including: a subscriber device on a transmitting side that generates an optical signal by superimposing the management control signal on a main signal and transmits the generated optical signal; a management control unit that outputs a management control signal which is superimposed on the optical signal transmitted by the subscriber device on the transmitting side and which has a frequency band different from a frequency of the management control signal superimposed on the optical signal; and a control signal superimposing unit that superimposes the management control signal output from the management control unit on the optical signal.

Abstract: An optical line terminal includes a communication unit configured to communicate with a plurality of optical network units, and a control unit configured to dynamically change at least one of a time width of a specific period and a cycle of the specific period, the specific period being a period in which an authentication request signal is received from the new optical network unit via the communication unit.

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: The communication device includes: a reception unit that receives burst frame signals from a plurality of other communication devices respectively; and a control unit that changes a block length of a moving average filter in carrier phase synchronization so as to minimize a phase noise amount of the burst frame signals.

Abstract: An optical transmission apparatus includes an optical transmitter that generates an optical signal in an uplink direction by modulating output light of a laser that outputs light of a first frequency with a subcarrier on which transmission data is superimposed, a heterodyne detection unit that receives an optical signal in a downlink direction by heterodyne detection, a control unit that calculates a first intermediate frequency based on the frequency of the downlink signal received by the heterodyne detection and the first frequency of the laser, and controls the first frequency of the laser when there is a difference between the calculated first intermediate frequency and a reference second intermediate frequency by a threshold or more.

Abstract: An optical switch having a plurality of ports outputs an optical signal, which is input from one of the plurality of ports, from another port. A quality compensator perform quality compensation of the optical signal output from the optical switch, and input the quality-compensated optical signal to the optical switch. A controller selects, among the plurality of quality compensators, a quality compensator that performs quality compensation according to the degree of quality deterioration of the optical signal when the optical signal input from a predetermined port of the optical switch is transmitted through a transmission path. The controller controls the optical switch so that the optical signal, in which quality is compensated by the selected quality compensator through the optical signal input from the predetermined port being output to the selected quality compensator, is output from the port corresponding to a transmission destination of the optical signal.

Abstract: An optical communication system includes: an optical fiber including a plurality of cores; a first optical communication device provided with an optical transmission unit and an optical reception unit each connected to one end of one of the cores on an interface surface; and a second optical communication device provided with an optical transmission unit and an optical reception unit each connected to another end of any one of the cores on an interface surface, in which one of the connection ends of the first optical communication device and of the second optical communication device being in a line-symmetric positional relationship with respect to a vertical line to a horizontal plane of when the first optical communication device and the second optical communication device are installed on the horizontal plane such that the interface surfaces of the first optical communication device and the second optical communication device face a front.

Abstract: An optical transmission device which transmits an optical signal between a communication terminal device and a network, without converting the optical signal into an electric signal, the optical transmission device including: a plurality of multiplexing/demultiplexing units which input and output the optical signal to and from the communication terminal device connected to an own device; a plurality of wavelength multiplexing separation units which input and output the optical signal to and from a network connected to the own device; an upstream signal demultiplexing unit which outputs the optical signal in an upstream direction, which is output from the multiplexing/demultiplexing unit, to an electric processing unit that executes predetermined electric processing on the optical signal; and an upstream signal multiplexing unit which outputs the optical signal in the upstream direction subjected to the electric processing by the electric processing unit to the predetermined wavelength multiplexing separation