Kokusai Denshin Denwa Kabushiki Kaisha

Other

Kddi Corporation

Honda Giken Kogyo Kabushiki Kaisha

Mitsubishi Denki Kabushiki Kaisha

Kdd Submarine Cable Systems, Inc.

Kddi Submarine Cable Systems Inc.

Honda Motor Co., Ltd.

Kdd Corporation

Toko Yakuhin Kogyo Co., Ltd.

Kajiwara Inc.

Masatoshi Suzuki

Noboru Edagawa

Shigeyuki Akiba

Shu Yamamoto

Hidenori Taga

Itsuro Morita

Yukio Horiuchi

Hideaki Tanaka

Takashi Mizuochi

Yuichi Matsushima

Yukio Noda

Tomohiro Otani

Takehiro Tsuritani

Kiwami Matsushita

Katsuyuki Utaka

Hideki Goto

Tadayoshi Kitayama

Toshio Kawazawa

Michiaki Hayashi

Yukitoshi Kushiro

Yasunori Kasahara

Kenkichi Shimomura

Daishi Ishii

Keiji Tanaka

Katsuhiro Shimizu

Aritomo Uemura

Naoto Hara

Kazuo Inoue

Koji Goto

Noriyuki Takeda

Takayuki Miyakawa

Ryo Kubota

Ryo Narisawa

Takeshi Komiya

Akira Goto

Yoshitsugu Gokan

Tadakatsu Shimada

Takaaki Tsukui

Minoru Matsuda

Hayato Maehara

Shinichi Nakagawa

Kazuo Koya

Hiroharu Wakabayashi

Tetsuya Miyazaki

Takashi Shinozaki

Kuniaki Motoshima

Satoshi Iijima

Takushi Matsuto

Masashi Usami

Tsuyoshi Takizawa

Toshio Shimada

Mamoru Uraki

Kentaro Kato

Yuichi Yamada

Eiichi Nakagawa

Kosuke Nishimura

Kenji Sugibayashi

Osamu Kubota

Satoru Takagi

Takashi Ichimura

Junichiro Yamashita

Yasunori Morimoto

Mehrdad Zangeneh

Naoki Norimatsu

Shunji Akamatsu

Shota Ishimura

Kosuke Ashihara

Kazuki Tanaka

Haruo Abe

Takaki Sakurai

Hidehiro Kajiwara

Isao Terabe

Norikazu Ishii

Kazuho Ohara

Kaoru Imai

An optical transmission system in which a transmitting station and a plurality of receiving stations are connected via an optical splitter, wherein the transmitting station includes: a controller configured to determine whether to perform intensity modulation or phase modulation on optical signals based on information on transmission distances to the receiving stations and modulation bands; an intensity modulator configured to perform intensity modulation on an optical signal; and a phase modulator configured to perform phase modulation on an optical signal, and wherein one of an intensity modulation signal and a phase modulation signal is transmitted from the transmitting station to each of the receiving stations.

Optical transmission system, PON system, and transmission method

Provided is a stirring device that allows a weight measurement during a rotation operation to be accurately performed while suppressing increase in reinforcement structures required for support of a stirring container and suppressing increase in weight. A device frame is provided with legs, a heating kettle is provided with a reinforcement base attached on the bottom side, a motor bed is provided to support a cutter/motor unit to the reinforcement base or the device frame, load cells are provided to indirectly measure a change in weight of a stirring substance in the heating kettle during a rotation operation of the cutter/motor unit, and closed reinforced structures are configured to include the heating kettle, the cutter/motor unit, the reinforcement base, and the supporting stand as reinforcing members.

Stirring device

An internal combustion engine includes a connecting rod that connects a crankpin and a piston. The connecting rod has first and second connecting rods, and a guide piston is disposed at a connecting portion between the first and second connecting rods. Deformed portions are formed on a lower end portion of a guide piston and on a balancer weight portion of a crankshaft in order to reduce the whole length of the connecting rod, whereby a bottom dead center of the guide piston is set to a lower position. The engine has improved thermal efficiency by reducing the distance between the crank portion and the piston, increasing the speed of behavior of the piston at a position near a top dead center to reduce thermal energy loss, and preventing generation of knocking.

Internal combustion engine

In a communication system wherein a station transceiver and a plurality of nodes communicate in a TDM system through a signal transmission line, at least a part of the line is shared, a method to judge nodes performing normal operation from the station transceiver comprises a request step to request a return of a test pattern by transmitting a trigger signal for a designated node in the plurality of nodes, a correlation process step to process correlation between a received signal in a timeslot assigned to the designated node and a reference pattern corresponding to the designated node, and a judging step to judge whether the designated node is a normal node according to the correlation process result.

Node judging method, communication system, and node measuring apparatus

An optical repeating system includes an optical transmitter and a plurality of optical amplifying repeaters. The optical transmitter specifies a part or all of the optical amplifying repeaters, and transmits a supervisory command to the specified optical amplifying repeaters as a first sub-signal via an uplink or downlink optical transmission line. The supervisory command is a command to supervise internal circuits of the optical amplifying repeaters. Receiving the supervisory command addressed thereto via the uplink or downlink optical transmission line, the optical amplifying repeaters each transmit a supervisory signal indicating a supervisory result corresponding to the supervisory command to optical receivers via the uplink and downlink optical transmission lines as a second sub-signal. The optical system can reduce the time take to acquire the supervisory information about the plurality of the optical amplifying repeaters.

Optical repeating system and optical amplifying repeater control method

To realize a highly reliable monitor control signal network at low costs, a data transmission system comprises a first network to optically transmit a data signal and a monitor control signal, first and second nodes connecting to the first network, and a second network capable of transmitting the monitor control signal. The first node comprises a demultiplexer to demultiplex the data signal and the monitor control signal out of the signal light from the first network, a signal distributor having a plurality of input ports and a plurality of output ports to distribute the data signal demultiplexed by the demultiplexer into designated output port, a controller to control the signal distributor and to monitor each part in the first node, a first selector to select one of the monitor control signal demultiplexed by the demultiplexer and the other monitor control signal entered from the second network and to apply the selected one to the controller, a second selector to output the monitor control signal output for the second node output from the controller toward one of the first network and the second networks, and a multiplexer to multiplex the monitor control signal output for the first network output from the second selector and the data signal output from the signal distributor and to output the multiplexed signals onto the first network.

Data transmission system, transmission method of optical network monitor control signal, and node

An optical repeating system includes an optical transmitter and an optical amplifying repeater. The optical transmitter transmits a supervisory command and a control command to the optical amplifying repeater as a first sub-signal. The supervisory command is a command to supervise internal circuits of the optical amplifying repeater, and the control command is a command to control the optical amplifying repeater. The optical amplifying repeater includes multiple sub-modules each for amplifying and repeating main signals on multiple sets of optical transmission lines. When receiving the supervisory command via the optical transmission line, each sub-module transmits a supervisory signal indicating the supervisory result associated with the supervisory command to an optical receiver as a second sub-signal. In addition, when receiving a predetermined control command via the optical transmission line, each sub-module initializes another sub-module of the multiple sub-modules in response to the predetermined control command. The optical amplifying repeater can restart its control program even when it has fallen into a state where it is difficult to continue to execute the normal operation in accordance with the control program because of some exception or the like.

The present invention regenerates optical signals in an intact optical state according to a low-speed optical clock. In one embodiment, an optical splitter applies a portion of optical pulse signals to a clock recovery circuit and the rest to an optical splitter. The optical splitter applies half of the input signal to an optical regenerator and the rest to another optical regenerator. The clock recovery circuit regenerates an electric clock signal with half the frequency of the input optical pulse and applies the clock to an optical clock pulse generator. The optical clock pulse generator generates an optical clock signal with half the frequency of the input optical pulse whose phase matches with that of the optical signal at the optical regenerator. An optical regenerator regenerates the optical signal from the optical splitter in an intact optical state. A polarization combiner combine the optical signals from the optical regenerators in mutually orthogonal polarization.

Optical signal regenerator

An optical reception apparatus comprises an optical receiver to receive an optical signal from an optical transmission line, an error corrector to correct an error of the received signal and to transmit the error-corrected signal and error rate information before error correction, a judging apparatus to judge transmission quality of the optical transmission line according to the error rate information from the error corrector and a threshold value equal to an error rate lower than an error correction limit of the error corrector, and a selective breaker to transmit the signal whose error is corrected by the error corrector in normal state and to block transmission of the signal whose error is corrected by the error corrector when the judged result by the judging apparatus indicates deterioration of the transmission quality of the optical transmission line.

Optical reception apparatus and optical transmission system

A charge-injected internal combustion engine exhibits improved starting performance with charge-injection timing control. A charge-injected internal combustion engine has an air-fuel injection valve for directly injecting a compressed air-fuel mixture into a combustion chamber. The engine is also provided with an air pump, driven by the crankshaft for discharging compressed air, and a timing controller for setting injection timing of the air-fuel injection valve. When initial startup of the engine is detected, the controller sets the injection timing to the intake stroke. When the engine reaches a predetermined engine speed, or when the pressure of the injection air reaches a threshold pressure where injection of the air-fuel mixture is possible on the compression stroke, the timing controller switches the injection timing from the intake stroke to the compression stroke.

Charge-injected internal combustion engine, and method of operating same

In an optical repeating system including an optical transmitter and optical amplifying repeaters, the optical transmitter specifies one optical amplifying repeater, and transmits to the optical amplifying repeater a supervisory command to supervise internal circuits of the optical amplifying repeater and a control command to control amplification factors of optical amplifiers of the optical amplifying repeater as a first sub-signal. Receiving the supervisory command via an optical transmission line, the optical amplifying repeater transmits a supervisory signal indicating a supervisory result corresponding to the supervisory command to optical receivers via optical transmission lines as a second sub-signal. Receiving the control command via the optical transmission line, the optical amplifying repeater is controlled to change amplification factors of the optical amplifiers in response to the control command.

The optical amplifier according to the present invention is constructed such that the amount of the electric current fed to the power feeding lineis first detected by the current detection means, and then a setting signal is generated to each of the bypass circuitsandin accordance with the thus detected amount of the fed current, and thereafter the output level of each of the optical repeater circuitsandis controlled respectively by the bypass circuitsand, so that the output level of these repeater circuitsandcan be controlled in accordance with the amount of the current fed to the power feeding line

Optical amplifier having various control circuitry

A supervisory system and supervisory method of an optical amplifier repeater are proposed that can implement operation supervision taking account of the characteristics of individual supervisory targets of the optical amplifier repeater, thereby achieving higher reliability. The supervisory system includes an optical transmitter for transmitting an optical signal including an operation command to notify of a state of a supervisory target; an optical amplifier repeater that transmits a response optical signal including a response code obtained by measuring the supervisory target in response to the operation command; an optical receiver for receiving the response optical signal via an optical fiber and an information processing unit for converting the response code into a numerical form by using a predetermined expression that links the response code with measured information obtained by measuring in advance the supervisory target with an external measuring device during operation of the optical amplifier repeater in response to the operation command.

Supervisory system of optical amplifier repeater system and supervisory method of optical amplifier repeater system

An optical clock multiplier comprises a phase modulator ( ) to shift a phase in pulse duration of an input optical clock pulse by &pgr;, a polarization mode dispersion device ( ) having a predetermined time difference between first and second polarizations orthogonal to each other to divide an output light from the phase modulator into the first and second polarization components, and a polarization device ( ) to extract one of polarization components in a third polarization practically inclined at an angle of 45&deg; against the first polarization and a fourth polarization orthogonal to the third polarization out of the output light from the polarization mode dispersion device.

Optical clock multiplier and method thereof

A piston slidably fitted in a cylinder is connected to an auxiliary piston slidably fitted in an auxiliary cylinder coaxial with the cylinder through a first connecting rod. The left and right crankshaft halves are disposed outside of a piston sliding range of the cylinder with respect to the radial direction thereof. The increase of the volume of a combustion chamber corresponding to the increase of the crank angle with reference to top dead center of the piston is suppressed, and it is therefore possible to enhance the equal volume degree at the time of combustion of a mixture gas and to enhance thermal efficiency. This arrangement also enhances thermal efficiency, and simplifies the structures of intake systems and valve mechanisms when employed in horizontally opposed type internal combustion engine.

Growing community of inventors

Saitama, Japan

Masatoshi Suzuki