Abstract: Provided is a communication system in which at least a master unit of the master unit and a slave unit is driven by a finite power source, in which the master unit notifies the slave unit by including period information indicating a shortest sleep period, which is a shortest possible period of a sleep period, in a communication signal with the slave unit before transitioning to a sleep state in which a power saving operation is possible and communication is disabled, with respect to the sleep period of operating in the sleep state after transitioning to the sleep state, and the slave unit performs a power saving operation during the shortest period notified of by the master unit.

Abstract: An optical transmission apparatus includes: a distributing unit which distributes a laser beam based on a first oscillation frequency; a phase modulator which generates, using the laser beam based on the first oscillation frequency, a phase-modulated signal that is an optical signal phase-modulated in accordance with a modulated signal; a multiplexing unit which multiplexes a laser beam based on a second oscillation frequency and the phase-modulated signal; a detecting unit which generates a frequency-modulated signal by performing detection processing on a result of multiplexing of the laser beam based on the second oscillation frequency and the phase-modulated signal; and an intensity modulator which generates, using the laser beam based on the first oscillation frequency, an optical signal intensity-modulated in accordance with the frequency-modulated signal.

Abstract: An optical communication device includes: a control signal generation unit that generates, on the basis of a communication log, a sleep cancellation signal including information about at least one time at which communication with a terminal device performing wireless communication with a power-receiving optical communication device is expected to be successful, the communication log including information about a result of communication at a time when sleep state cancellation is performed on the power-receiving optical communication device that is driven by electrical power obtained from an optical signal for power supply; and an optical communication unit that converts the generated sleep cancellation signal into an optical signal, and transmits the optical signal to the power-receiving optical communication device.

Abstract: There is provided a signal amplification method executed by an optical reception device, the method including: an electrical conversion step of converting an optical intensity modulation signal according to a frequency modulation signal which is converted from a frequency division multiplexing signal into the frequency modulation signal; a delay control step of controlling a delay amount of the frequency modulation signal based on a center frequency of the frequency modulation signal and a shift amount of a highest frequency of the frequency modulation signal; a delay detection step of demodulating the frequency modulation signal into the frequency division multiplexing signal by executing demodulation processing based on delay detection on the frequency modulation signal of which the delay amount is controlled; an amplification factor derivation step of deriving an amplification factor of the demodulated frequency division multiplexing signal based on the delay amount; and an amplification step of amplifying

Abstract: There are included a control unit configured to, when detecting that no high priority traffic frame arrives for a frame interval threshold or longer in the period that allows high priority traffic frames to be transmitted, release the period that allows high priority traffic frames to be transmitted and allocate the released period to the period that allows low priority traffic frames to be transmitted, a frame arrival time information acquisition unit configured to obtain information of frame arrival times of high priority traffic frames, a frame interval calculation unit configured to calculate, in accordance with the information of frame arrival times obtained by the frame arrival time information acquisition unit, frame intervals between frames of the high priority traffic frames input in chronological order, a frame interval threshold calculation unit configured to calculate a new frame interval threshold in accordance with the frame intervals, and a frame interval threshold configuration unit configured

Abstract: In a communication control system having a plurality of layer 2 switches and a network controller, the network controller includes a determination unit and an instruction unit, the determination unit being configured to determine whether or not a transfer communication flow feature indicating a feature of a communication flow transferred by a layer 2 switch of the plurality of layer 2 switches is similar to an abnormal communication flow feature indicating a feature of a communication flow when an abnormality occurs; and the instruction unit being configured to: output to the layer 2 switch, when the determination unit determines that the transfer communication flow feature is similar to the abnormal communication flow feature, a first instruction to lower priority of transfer processing for the communication flow and a second instruction to duplicate the communication flow to the layer 2 switch; or output the first instruction to the layer 2 switch, and output, to a server detecting a malicious attack, ident

Abstract: An optical transmission device includes: a first optical phase modulator that outputs a first optical signal by phase-modulating the laser beam having a first oscillation frequency according to the first electric signal in a case where the first electric signal is output to the first transmission path, a second optical phase modulator that outputs a laser beam having a second oscillation frequency as the second optical signal in a case where the first electric signal is output to the first transmission path; an optical multiplexer/distributor that outputs a third optical signal and a fourth optical signal by multiplexing the first optical signal and the second optical signal and distributing a result of the multiplexing; a first detection unit that converts the third optical signal into a first heterodyne detection signal; a second detection unit that converts the fourth optical signal into a second heterodyne detection signal; and a first optical intensity modulator that intensity-modulates a laser beam havi

Abstract: A signal forwarding system includes: a plurality of signal forwarding devices forming a plurality of communication routes between a slave station and a master station; and a route control device that determines a communication route, wherein the route control device includes at least: a communication route calculation unit that calculates a communication route in response to a route switching request; and a forward destination setting instruction unit that outputs forward destination setting information based on the communication route, the signal forwarding devices include at least: a forward destination setting instruction acquisition unit that acquires the forward destination setting information; a forward destination set unit that changes a forward destination based on the forward destination setting information; and a forward unit that outputs input traffic based on the forward destination, and any of the route control device and the signal forwarding devices includes: a traffic monitor unit; a non-signa

Abstract: An optical transmission apparatus includes: a distribution unit configured to distribute a modulation signal to a plurality of amplification units connected in parallel; a plurality of phase modulators which are connected in cascade to generate a phase-modulated optical signal in accordance with each modulation signal of which voltage is amplified by the plurality of amplification units connected in parallel by using a laser beam based on a first oscillation frequency; a multiplexing unit configured to multiplex a laser beam based on a second oscillation frequency and the optical signal; and a detection unit configured to generate a frequency modulation signal by executing detection processing on a result of multiplexing the laser beam based on the second oscillation frequency and the optical signal.

Abstract: An optical transmission device includes: an FM batch conversion unit that performs FM batch conversion on a carrier signal input from the outside, to generate an FM batch conversion signal; a signal branching unit that causes the FM batch conversion signal to branch into a first path and a second path; an optical transmission unit that is provided in the first path, converts the FM batch conversion signal into an optical signal, and transmits the optical signal to the outside; and a detection unit that is provided in the second path, and detects quality degradation of the FM batch conversion signal on the basis of the signal level of the FM batch conversion signal.

Abstract: A path control method of controlling a communication path in a network including a plurality of wireless devices communicating with a terminal in a wireless manner and a plurality of wireless control devices communicating with any one of the plurality of wireless devices through a plurality of signal transfer devices includes searching for available communication paths and listing the available communication paths for individual combinations of a wireless device of the plurality of wireless devices and a wireless control device of the plurality of wireless control devices, and selecting a combination of communication paths in which a maximum value of the number of communications passing through the same output port of a signal transfer device of the plurality of signal transfer devices is minimized from among the listed available communication paths.

Abstract: A signal converting apparatus includes a conversion unit, a measurement unit, and a control unit. The conversion unit performs FM batch conversion on an input signal containing a plurality of carrier signals, to generate an FM signal. The measurement unit measures the carrier levels of the plurality of carrier signals contained in the input signal, and the maximum frequency of the input signal. The control unit calculates the frequency deviation amount of the entire input signal, on the basis of the measured carrier levels of the respective carrier signals. Using the calculated frequency deviation amount and the measured maximum frequency, the control unit calculates a center frequency for the FM signal, and controls the conversion unit so that the center frequency of the FM signal to be generated by the FM batch conversion becomes equal to the calculated center frequency.

Abstract: A light receiving portion of a photodiode is connected to an external light source via an optical transmission line. A power storage unit stores electrical energy generated by the photodiode. A bias circuit takes out electrical energy corresponding to the amount of stored power from the power storage unit, and applies a voltage to the cathode of the photodiode.

Abstract: A communication control system includes a plurality of layer 2 switches (SWs); and a communication control device that controls communication of the SWs. Each SW includes one or more queues that each have a variable queue length for accumulating input frames, and a transmission unit that has a shaping function of transmitting the frames accumulated in the queues to a desired destination at a desired rate.

Abstract: Provided is a path control method of controlling a path of communication in a network including a high priority device dealing with high priority traffic, a high priority control device communicating with the high priority device through a plurality of signal transfer devices transferring signals by periodically repeating a high priority signal transmissible period in which high priority traffic is transmissible and a low priority signal transmissible period in which low priority traffic is transmissible, a low priority device dealing with the low priority traffic, and a low priority control device communicating with the low priority device through the plurality of signal transfer devices, the path control method including calculating a low priority signal transmissible period in each of paths between the low priority device and the low priority control device, and performing setting for switching the path between the low priority device and the low priority control device so that the low priority traffic is

Abstract: A communication control apparatus includes an observed data rate acquiring unit configured to acquire observed data rates indicating input data rates of queues, the observed data rates being observed in a layer 2 switch, a threshold value storage unit configured to store predetermined threshold values of the queues, a shaping rate determination unit configured to determine a shaping rate of each queue based on both observed data based on an observed data rate of the observed data rates acquired by the observed data rate acquiring unit and a threshold value of the predetermined threshold values stored in the threshold value storage unit, and a shaping rate setting unit configured to set, in the layer 2 switch, the shaping rate of each queue determined by the shaping rate determination unit.

Abstract: A communication control system is a communication control system including: a plurality of layer 2 switches; and a control apparatus. Each of the plurality of layer 2 switches includes a queue having a queue length being adjustable for each of transfer routes of data, and a transmission unit configured to transmit the data stored in the queue for each of the transfer routes to a subsequent destination of the data at a data rate being adjustable for each of the transfer routes. The control apparatus includes an adjustment processing unit configured to acquire information representing a discarded data amount being a data amount of the data discarded in the queue from one of the plurality of layer 2 switches having discarded the data, and adjust the queue length and the data rate of each of the plurality of layer 2 switches for each of the transfer routes, based on the discarded data amount.

Abstract: A data collection unit of an NW controller (6) collects, from an L2SW (5) constituting an L2NW (4), uplink observation data indicating traffic volume of a session request packet addressed to an application server 2 and downlink observation data indicating traffic volume of a session response packet transmitted from the application server 2, which are acquired by observing packets input to the L2SW (5). A control unit changes shaping rate of the packets addressed to the application server (2) through the L2SW (5) included in the L2NW (4) based on a ratio between the traffic volume indicated by the uplink observation data and the traffic volume indicated by the downlink observation data, or a ratio between an increment of the traffic volume acquired from the uplink observation data and an increment of the traffic volume acquired from the downlink observation data.

Abstract: There are included a control unit configured to, when detecting that no high priority traffic frame arrives for a frame interval threshold or longer in the period that allows high priority traffic frames to be transmitted, release the period that allows high priority traffic frames to be transmitted and allocate the released period to the period that allows low priority traffic frames to be transmitted, a frame arrival time information acquisition unit configured to obtain information of frame arrival times of high priority traffic frames, a frame interval calculation unit configured to calculate, in accordance with the information of frame arrival times obtained by the frame arrival time information acquisition unit, frame intervals between frames of the high priority traffic frames input in chronological order, a frame interval threshold calculation unit configured to calculate a new frame interval threshold in accordance with the frame intervals, and a frame interval threshold configuration unit configured

Abstract: A signal forwarding system includes: a plurality of signal forwarding devices forming a plurality of communication routes between a slave station and a master station; and a route control device that determines a communication route, wherein the route control device includes at least: a communication route calculation unit that calculates a communication route in response to a route switching request; and a forward destination setting instruction unit that outputs forward destination setting information based on the communication route, the signal forwarding devices include at least: a forward destination setting instruction acquisition unit that acquires the forward destination setting information; a forward destination set unit that changes a forward destination based on the forward destination setting information; and a forward unit that outputs input traffic based on the forward destination, and any of the route control device and the signal forwarding devices includes: a traffic monitor unit; a non-signa