Nippon Telegraph and Telephone Corporation

Showa Denko K.k.

Ntt Electronics Corporation

Tomoaki Yoshida

Shunji Kimura

Toshiaki Shitaba

Shin Kaneko

Hiroaki Katsurai

Akihiro Tanabe

Takashi Mitsui

Kyo Minoguchi

Kenta Ito

Hiroshi Takada

Shinya Tamaki

Kota Asaka

Yoichi Fukada

Koji Kitahara

Haruka Nagoshi

Hitoshi Inoue

Toshio Morita

Hirotaka Nakamura

Shigeru Kuwano

Kotaro Yano

Eiji Kambara

Ryo Miyatake

Katsuhisa Taguchi

Takayoshi Tashiro

Eiji Kanbara

Manabu Kubota

Masaharu Toki

Shun Morishima

Toshinori Hanano

Satoshi Shimazu

Masayoshi Sekiguchi

Eiji Kanabara

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.

Optical communication system, control method and optical subscriber line terminal apparatus

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 signal of a continuous wave, and an external transmission/reception unit for performing frequency conversion on the radio signal transmitted from the external device.

Optical power supply system, optical power supply method and power receiving optical communication apparatus

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

Optical power supply system, power receiving side optical communication device and power supply method

A communication apparatus includes a communication unit, a power supply unit, a temperature monitoring unit, and a control unit. The communication unit communicates with an additional apparatus. The power supply unit supplies power to components mounted in the communication apparatus. The temperature monitoring unit monitors a temperature in the communication apparatus to detect presence or absence of a temperature abnormality. In a case where the temperature monitoring unit detects the temperature abnormality, the control unit performs power supply stop processing of stopping the power supply from the power supply unit to at least some of the components. Furthermore, the control unit stops or decreases communication of the communication unit in a case where the temperature monitoring unit detects the temperature abnormality.

Communication apparatus and temperature monitoring method

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.

Signal converting apparatus and signal converting method

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 performs control to switch a functional unit from a sleep state to an activated state in response to the sleep cancellation signal detected by the detection unit.

Optical power supply system, wakeup method and optical communication device on the receiving side

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.

Optical power reception apparatus, communication apparatus and optical power reception method

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 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, outputs data equal to or less than a transferable data amount to both or either of the optical transmission/reception unit and the external transmission/reception unit and the external transmission/reception unit, and stores the data exceeding the transferable data amount in the data storage unit.

Optical power supply system, power receiving side optical communication device and data transfer method

An optical communication system includes a first optical communication device; a plurality of second optical communication devices configured to perform communication with the first optical communication device; a chromatic dispersion compensation device connected to the first optical communication device; and an optical transmission line connected to the chromatic dispersion compensation device, a path of the optical transmission line connected to the chromatic dispersion compensation device being split into a plurality of paths at a branch point, the resulting paths being respectively connected to the plurality of second optical communication devices, and the optical transmission line being configured to transmit optical signals through the paths, in which the chromatic dispersion compensation device includes a chromatic dispersion compensator configured to perform chromatic dispersion compensation corresponding to amounts of chromatic dispersion generated in optical signals propagated through respective paths between the first optical communication device and the plurality of second optical communication devices.

Optical communication system

An apparatus includes a reception processing unit configured to output a frequency division multiplexed signal obtained from a transmission signal transmitted over the wired communication network, an output control unit configured to output, in a case that apparatus identifying data matches signal specifying data, a frequency band specifying data indicating a frequency band corresponding to the signal specifying data, the apparatus identifying data being for requesting signal quality degradation, and the signal specifying data specifying a carrier signal requesting signal quality degradation among a plurality of carrier signals included in the frequency division multiplexed signal, a disturbing signal generation unit configured to generate a disturbing signal in a frequency band corresponding to the frequency band specifying data output by the output control unit, and a multiplexing unit configured to multiplex the frequency division multiplexed signal and the disturbing signal to output.

Communication network terminating device, communication system, signal jamming method and signal jamming program

In an optical transmission system including a plurality of optical transmitting units and a relay device, the plurality of optical transmitting units include a frequency modulation conversion unit that converts an input signal into a frequency modulation signal through frequency modulation conversion processing, a multiplexing unit that multiplexes monitoring signals with different frequencies with the frequency modulation signal, and an optical modulation unit that converts the frequency modulation signal that is an electric signal in which the monitoring signals are multiplexed into optical signals having different wavelengths, and the relay device includes a photoelectric conversion unit that acquires a combined signal obtained by combining optical signals having different wavelengths from each other and converts the combined signal into an electric signal, and a measuring unit that measures transmission quality of the plurality of monitoring signals included in the electric signal.

Optical transmission system and transmission quality monitoring method

An optical transmission system includes a first optical communication device configured to output an optical signal, a first FBG-DCM configured to perform wavelength dispersion compensation on the optical signal output by the first optical communication device, and a second optical communication device configured to receive the optical signal wavelength-dispersion compensated by the first FBG-DCM through at first optical transmission path of an optical fiber.

Optical transmission system and optical transmission method

An optical transmission apparatus includes an input unit, a demultiplexing unit, a measurement unit, and a switching unit. The input unit inputs a first multiplexed signal and a second multiplexed signal each obtained by multiplexing a plurality of optical signals having different wavelengths. The demultiplexing unit demultiplexes the first multiplexed signal and the second multiplexed signal by wavelength. The measurement unit measures qualities of a plurality of optical signals obtained by demultiplexing the first multiplexed signal and qualities of a plurality of optical signals obtained by demultiplexing the second multiplexed signal. The switching unit performs switching between the first multiplexed signal and the second multiplexed signal to be output to a subsequent stage based on a result of measurement by the measurement unit.

Optical transmission apparatus and optical transmission method

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.

Optical communication system, optical line termination apparatus and optical communication control method

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 which the N optical signals demultiplexed by the second demultiplexing unit are respectively input, each of the N second detection units configured to detect presence or absence of deterioration of a corresponding input optical signal of the input optical signals based on a signal level of the corresponding input optical signal; and a selection unit configured to select, based on the detection result of presence or absence of deterioration of each of the optical signals by the first detection units and the second detection units, N optical signals having different wavelengths from either the optical signals demultiplexed by the first demultiplexing unit or the optical signals demultiplexed by the second demultiplexing unit.

Growing community of inventors

Yokosuka, Japan

Tomoaki Yoshida