Abstract: An optical communication system includes an optical line terminal and a plurality of optical network units connected by optical transfer paths. The optical line terminal includes a light transmitting/receiving unit and a control unit. The light transmitting/receiving unit transmits/receives an optical signal to/from the plurality of optical network units via the optical transfer paths. The control unit performs control to change a launch power of an optical signal transmitted from the light transmitting/receiving unit, such that, when, regarding at least one optical network unit, a monitoring value has changed to a value indicating deterioration, a receive power of an optical signal in each of the plurality of optical network units is lower than or equal to an upper limit value and a receive power of an optical signal in the optical network unit in which the monitoring value has changed is higher than or equal to a lower limit value.

Abstract: The laser welding device includes a laser transmission window and a gas injection nozzle. The gas injection nozzle includes an optical path hole and an injection unit that injects an inert gas for shielding metal vapor into the optical path hole toward an irradiation direction side and an optical axis side of a laser beam.

Abstract: A vehicle control device mounted on a vehicle includes a first traveling mode being driven by the torque output from a first rotary electric machine, and a second traveling mode being driven by the engine torque output from an engine and the torque output from the first rotary electric machine, wherein a section 1 for cranking the engine by the output of the second rotary electric machine and a section 2 for assisting the driving force of the engine by the output of the first rotary electric machine are provided during a period from the first traveling mode to the engagement of the clutch at the time of starting the engine to the second traveling mode, and the torque increase of the first rotary electric machine is limited in the section 1.

Abstract: An optical transmission apparatus of an embodiment is an apparatus for redundantly transmitting a multiplexed signal obtained by multiplexing N (N is an integer of 2 or greater) optical signals having different wavelengths, the apparatus including: a first demultiplexing unit to which a first multiplexed signal is input, the first demultiplexing unit configured to demultiplex the input first multiplexed signal into the N optical signals; N first detection units to which the N optical signals demultiplexed by the first demultiplexing unit are respectively input, each of the N first detection units configured to detect presence or absence of deterioration of a corresponding input optical signals of the input optical signals based on a signal level of the corresponding input optical signal; a second demultiplexing unit to which a second multiplexed signal is input, the second demultiplexing unit configured to demultiplex the input second multiplexed signal into the N optical signals; N second detection units to

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: An optical power supply system comprising: a power supply optical communication device that supplies power using an optical signal for power supply; and a power reception optical communication device that is driven by power obtained from the optical signal for power supply transmitted from the power supply optical communication device, wherein the power supply optical communication device includes an optical power supply unit that transmits the optical signal for power supply to the power reception optical communication device, and an optical signal generation unit that converts a continuous wave used for frequency conversion of a radio signal received by the power reception optical communication device into an optical signal and transmits the optical signal to the power reception optical communication device, the power reception optical communication device includes a photoelectric conversion unit that converts the optical signal transmitted from the power supply optical communication device into an electric

Abstract: An optical power supply system includes a power supply optical communication device that supplies power using an optical signal for power supply and a power reception optical communication device that is driven by power obtained from the optical signal for power supply transmitted from the power supply optical communication device, wherein the power supply optical communication device includes an optical power supply unit that transmits the optical signal for power supply to the power reception optical communication device and a data transmission/reception unit that transmits the optical signal for power supply to the power reception optical communication device when there is no data to be transmitted to the power reception optical communication device, and the power reception optical communication device includes a power storage unit that stores power obtained based on the optical signal for power supply transmitted from the optical power supply unit and the optical signal for power supply transmitted from t

Abstract: An optical power supply system, comprising: a power supply optical communication device that supplies power using an optical signal for power supply; and a power receiving optical communication device that is driven by power obtained from the optical signal for power supply transmitted from the power supply optical communication device, wherein the power supply optical communication device includes an optical power supply unit that transmits the optical signal for power supply to the power receiving optical communication device, when there is data to be transmitted to the power receiving optical communication device, transmit a sleep control signal having a shape corresponding to the time length of the data or having a shape with high noise resistance, to cancel a sleep state of a part of function units of the power receiving optical communication device, to the power receiving optical communication device, and the power receiving optical communication device includes a signal detection unit that detects the

Abstract: A power supply side optical communication apparatus supplies power to a power receiving side optical communication apparatus using an optical signal for power supply, a power storage unit stores the supplied power, a data control unit of the power supply side optical communication apparatus superimposes data transmission/reception control information related to transmission/reception of data transmitted/received by a data transmission/reception unit on the optical signal for power supply, a control information detection unit detects the data transmission/reception control information superimposed on the optical signal for power supply, and a power supply control unit detects presence or absence of transmission and reception of the data in an optical transmission/reception unit and an external transmission/reception unit on the basis of the data transmission/reception control information detected by the control information detection unit and data stored in a data storage unit, and supplies the power stored in

Abstract: A higher-level device in an optical access system including: the higher-level device; a transition source subscriber line terminal station device before device replacement, the transition source subscriber line terminal station device communicating with the higher-level device and one or more subscriber line terminal devices; and a transition destination subscriber line terminal station device that is a device replacement destination, the higher-level device including a transfer control unit that transfers, in a case where data transmitted from the transition destination subscriber line terminal station device is received at a time of device replacement, to the transition destination subscriber line terminal station device, data addressed to one of the subscriber line terminal devices that is a transmission source of the data transmitted from the transition destination subscriber line terminal station device.

Abstract: A transition destination subscriber line terminal station device in an optical access system including: a transition source subscriber line terminal station device before device replacement; and the transition destination subscriber line terminal station device that is a device replacement destination, the transition destination subscriber line terminal station device including: a higher-level device side transition unit including a higher-level port for connecting to the higher-level device and a first transition port that transfers data transferred from the higher-level device to the transition source subscriber line terminal station device; a subscriber side transfer unit including subscriber side connection ports for connecting to one or more subscriber line terminal devices, and a second transition port that transfers data transmitted from the subscriber line terminal devices to the transition source subscriber line terminal station device; a transfer table setting unit that changes a setting of a transf

Abstract: A laser welding device includes a chamber which has an internal space in which a workpiece is disposed, a laser beam irradiation unit which irradiates the workpiece with a laser beam to weld the workpiece, a vacuum pump which suctions air in the chamber to decrease a pressure in the chamber, a laser transmission window through which the laser beam emitted from the laser beam irradiation unit is transmitted, and a shutter which is disposed on the chamber side with respect to the laser transmission window and closed when the pressure in the chamber is returned to the atmospheric pressure after laser welding.

Abstract: An aspect of the present invention is an optical communication system in which an optical line terminal and an optical network unit are connected by an optical communication line, in which when receiving a first activation signal from the optical line terminal in a sleep state, the optical network unit executes activation processing for transition from the sleep state to an activation state and notifies the optical line terminal of an activation time that is a time required for executing the activation processing, and the optical line terminal transmits the activation signal at a time of transmission of second and subsequent activation signals, and then the optical line terminal starts data transmission to the optical line terminal after elapse of the activation time a notification of which has been given from the optical network unit.

Abstract: A communication apparatus includes a plurality of devices, each of the plurality of devices includes a monitoring unit configured to monitor at least one other device to detect an error that has occurred in the other device, and each of the plurality of devices is monitored by at least one other device.

Abstract: A power supply side optical communication apparatus supplies power to a power receiving side optical communication apparatus using an optical signal for power supply, a power storage unit stores the supplied power, a data control unit of the power supply side optical communication apparatus superimposes data transmission/reception control information related to transmission/reception of data transmitted/received by a data transmission/reception unit on the optical signal for power supply, a control information detection unit detects the data transmission/reception control information superimposed on the optical signal for power supply, a data transfer control unit calculates a data amount of data to be output to each of an optical transmission/reception unit and an external transmission/reception unit on the basis of the data transmission/reception control information and a data amount of data stored in a data storage unit, outputs data equal to or less than a transferable data amount calculated on the basis

Abstract: A transition assistance device that assists device replacement in an optical access system including a transition source subscriber line terminal station device and a transition destination subscriber line terminal station device, the transition assistance device including: a first member, and a second member that is movable, in which the first member includes a first port for connecting to the transition source subscriber line terminal station device, and a second port for connecting to the transition destination subscriber line terminal station device, the second member includes a third port for connecting to one or more subscriber line terminal devices connected to the transition source subscriber line terminal station device, and at a start of the device replacement, the first port and the third port are connected to each other via a connection line; a cutting unit that cuts the connection line connecting the first port and the third port to each other after the transition assistance device is connected t

Abstract: An optical power supply system including a power supply side optical communication device that supplies power using an optical signal for power supply, and a power receiving side optical communication device that is driven by power obtained from the optical signal for power supply transmitted from the power supply side optical communication device, in which: the power supply side optical communication device includes a sleep control unit that generates a sleep cancellation signal for canceling sleep states of some functional units included in the power receiving side optical communication device, and a power supply control unit that superimposes the sleep cancellation signal on the optical signal for power supply and transmits the superimposed signal to the power receiving side optical communication device; and the power receiving side optical communication device includes a detection unit that detects the sleep cancellation signal superimposed on the optical signal for power supply, and a control unit that p

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: An optical transmission device includes a distribution unit which generates a first modulated signal and a second modulated signal by distribution processing for an input signal; a first phase modulator which generates a first optical signal phase-modulated in accordance with the first modulated signal by using a laser beam based on a first oscillation frequency; a phase adjustment unit which generates the second modulated signal of a phase opposite to a phase of the first modulated signal; a second phase modulator which generates a second optical signal phase-modulated in accordance with the second modulated signal of the opposite phase by using a laser beam based on a second oscillation frequency; a multiplexing unit which multiplexes the first optical signal and the second optical signal; and a detection unit which generates a frequency-modulated signal by performing square-law detection processing on a result of multiplexing.

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.