Patents by Inventor Yutaka Miyamoto
Yutaka Miyamoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7995930Abstract: The present invention relates to an optical receiver, in which the transmittance of a Mach-Zehnder interferometer can be locked at a normal operation point in a simple structure and control. A transmittance detecting circuit and a minute modulation signal detecting circuit are provided in parallel after a balanced optical receiver, and a switch is selectively connectable either a minute modulation signal detecting circuit and a transmittance detecting circuit. In the initial stage of frequency pull-in, the switch is set to connect the transmittance detecting circuit to the synchronous detection circuit. If the transmittance detecting circuit detects that the transmittance of the Mach-Zehnder interferometer at the carrier frequency becomes a desired transmittance, the connection of the switch is switched from the transmittance detecting circuit to the minute modulation signal detecting circuit.Type: GrantFiled: May 19, 2006Date of Patent: August 9, 2011Assignees: NTT Electronics Corporation, Nippon Telegraph and Telephone CorporationInventors: Mikio Yoneyama, Fumiaki Saitou, Shigeru Ono, Yosuke Takeuchi, Kazushige Yonenaga, Shoichiro Kuwahara, Eiji Yoshida, Yutaka Miyamoto, Hiroto Kawakami
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Patent number: 7970008Abstract: A multiplexing transmission system for adding a management overhead to a client signal, and transparently accommodating or multiplexing the client signal to transmit it is provided. The multiplexing transmission system: accommodates a plurality of client signals of different bit rates including a client signal of a bit rate that is not an integral multiple or an integral submultiple of a bit rate of other client signal, and performs rate adjustment for a part or the whole of the plurality of client signals such that the bit rate of each client signal becomes an integral multiple or integral submultiple of the bit rate of other client signal.Type: GrantFiled: September 21, 2007Date of Patent: June 28, 2011Assignee: Nippon Telegraph and Telephone CorporationInventors: Yoshiaki Kisaka, Shigeki Aisawa, Tetsuo Takahashi, Takuya Ohara, Masafumi Koga, Masahito Tomizawa, Yutaka Miyamoto
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Publication number: 20110129041Abstract: A receiver device receives a signal inputted to one or a plurality of ports as a plurality of received signals, and includes: a phase offset estimating unit that, on the basis of a unique word of each signal block contained in said received signal, estimates the phase offset, and a phase offset compensating unit that, on the basis of a phase offset estimated by said phase offset estimating unit, compensates the phase offset; the receiver device uses a known signal component (unique word) contained in a frequency-domain equalized signal to compensate the phase offset, whereby it compensates complex phase offset fluctuation, and estimates the phase offset of a signal obtained at each port.Type: ApplicationFiled: June 19, 2009Publication date: June 2, 2011Applicant: Nippon Telegraph and Telephone CorporationInventors: Koichi Ishihara, Takayuki Kobayashi, Riichi Kudo, Yasushi Takatori, Munehiro Matsui, Masato Mizoguchi, Akihide Sano, Eiichi Yamada, Etsushi Yamazaki, Yutaka Miyamoto, Hideyuki Nosaka
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Patent number: 7920793Abstract: An inline repeater that uses a forward-pumped DRA that can use a pumping light source such as an FBG pumping light source and a fiber laser, which are the most commonly used, and an optical fiber communication system are realized.Type: GrantFiled: June 17, 2005Date of Patent: April 5, 2011Assignee: Nippon Telegraph and Telephone CorporationInventors: Hiroji Masuda, Kenji Sato, Yutaka Miyamoto
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Publication number: 20110002689Abstract: A high-performance optical OFDM receiver is realized. A subcarrier separation circuit receives an optical OFDM signal consisting of two subcarriers A and B and separates a subcarrier component, signal light and first local oscillator light are input to the subcarrier separation circuit, the subcarrier separation circuit converts the signal light and the first local oscillator into a baseband electrical signal, the subcarrier separation circuit converts the baseband electrical signal into a digital signal, the subcarrier separation circuit shifts the frequency of the converted digital signal so that a center frequency of the subcarrier A becomes zero, and the subcarrier separation circuit adds a frequency shifted signal to a signal obtained by delaying the frequency shifted signal by ½ of a symbol time to separate a component of the subcarrier A.Type: ApplicationFiled: February 20, 2009Publication date: January 6, 2011Applicant: Nippon Telegraph and Telephone CorporationInventors: Akihide Sano, Eiichi Yamada, Takayuki Kobayashi, Koichi Ishihara, Yutaka Miyamoto, Riichi Kudo
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Publication number: 20100252002Abstract: In a fuel injector, a body has formed therein a spray hole and a fuel supply passage. Fuel supplied to the fuel supply passage is delivered to the spray hole. A fuel pressure sensor produces a signal indicative of a pressure of the fuel. First terminals are attached to the fuel pressure sensor, and include a terminal for outputting the signal. The fuel pressure sensor is threadedly installed in the body while the plurality of first terminals are rotated about a preset axis. A connector includes a housing attached to the body, and second terminals supported by the housing for external electric connection of the fuel pressure sensor. Electrodes are each arranged to extend around the preset axis in a circular arc. Each of the electrodes electrically connects a corresponding one of the first terminals to a corresponding one of the second terminals.Type: ApplicationFiled: April 2, 2010Publication date: October 7, 2010Applicant: DENSO CORPORATIONInventors: Tomoki Fujino, Jun Kondo, Yutaka Miyamoto
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Publication number: 20100251998Abstract: A stem is installed to an injector body and is resiliently deformable upon receiving a pressure of high pressure fuel conducted through a high pressure passage of the injector body. A strain gauge is installed to the stem to sense a strain generated in the stem. A molded IC device executes an amplifying operation, which amplifies a signal received from the strain gauge. The stem, the strain gauge and the molded IC device are integrally assembled together to form a fuel pressure sensing unit, which is installed to the injector body by threadably fastening a threaded portion, which is formed at the stem, to the injector body.Type: ApplicationFiled: April 2, 2010Publication date: October 7, 2010Applicant: DENSO CORPORATIONInventors: Jun KONDO, Tomoki Fujino, Hiroshi Tsuda, Yutaka Miyamoto
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Publication number: 20100252001Abstract: In a fuel injector, a body has formed therein a spray hole and a fuel supply passage. Fuel supplied to the fuel supply passage is delivered to the spray hole. A fuel pressure sensor produces a signal indicative of a pressure of the fuel. First terminals are attached to the fuel pressure sensor and include a terminal for outputting the signal. The fuel pressure sensor is threadedly installed in the body while the first terminals are rotated. A connector includes a housing attached to the body, and second terminals supported by the housing for external electric connection of the fuel pressure sensor. Wires are operative to establish electrical connection between the first terminals and the second terminals. A wire holder is configured to hold each of the plurality of wires at least partly around the fuel pressure sensor.Type: ApplicationFiled: April 2, 2010Publication date: October 7, 2010Applicant: DENSO CORPORATIONInventors: Kouji MORITA, Yutaka Miyamoto, Jun Kondo, Tomoki Fujino
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Publication number: 20100252651Abstract: A fuel injection apparatus that includes a body, a nozzle, a pressure control unit, and a physical quantity measurement unit. The body has a fuel inlet port and a high-pressure fuel passage that is communicated with the fuel inlet port. The pressure control unit controls opening and closing of the nozzle. The fuel inlet port projects in a radially outward direction of the body. The body includes a fuel outlet port located on a lateral side of a longitudinal axis of the body opposite from the fuel inlet port. The physical quantity measurement unit is provided between the fuel inlet port and the fuel outlet port, and the physical quantity measurement unit measures a physical quantity of high pressure fuel introduced from the fuel inlet port.Type: ApplicationFiled: April 1, 2010Publication date: October 7, 2010Applicant: DENSO CORPORATIONInventors: Shu Kagami, Jun Kondo, Tomoki Fujino, Yutaka Miyamoto
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Publication number: 20100252659Abstract: A fuel injection apparatus includes a body, a nozzle, a pressure control unit, a physical quantity measurement unit, a first terminal, a second terminal, a positioning member, and a resin connector main body portion. The pressure control unit controls opening and closing of the nozzle The physical quantity measurement unit outputs an electric signal in accordance with a physical quantity of high pressure fuel. The first terminal is connected to the pressure control unit. The second terminal connected to the physical quantity measurement unit. The positioning member integrally holds the first terminal and the second terminal and locates the first terminal and the second terminal at predetermined positions. The connector main body portion receives therein the positioning member.Type: ApplicationFiled: April 1, 2010Publication date: October 7, 2010Applicant: DENSO CORPORATIONInventors: Tomoki FUJINO, Jun KONDO, Shu KAGAMI, Yutaka MIYAMOTO
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Publication number: 20100220376Abstract: An optical modulator and an optical transmission system convert continuous light of a multiple wavelength light source, which generates the continuous light with a fixed and complete phase but different frequencies, to a modulator driving signal so as to generate a light subcarrier with each frequency at the center and modulate the continuous light to the light subcarrier by using the modulator driving signal. In the case where an optical modulation is carried out by an optical IQ-modulator, transmitting data, for example, is converted to two parallel data A(t) and B(t), an I phase signal, in which the data A(t)+B(t) are modulated with a clock signal with a frequency ?, and a Q phase signal, in which the data A(t)?B(t) are modulated with a clock signal with a ?/2 phase shifted, are generated, and the I phase signal and the Q phase signal are applied to electrodes of the optical IQ-modulator, respectively.Type: ApplicationFiled: July 4, 2008Publication date: September 2, 2010Inventors: Takayuki Kobayashi, Akihide Sano, Yutaka Miyamoto
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Publication number: 20100177785Abstract: A multiplexing transmission system for adding a management overhead to a client signal, and transparently accommodating or multiplexing the client signal to transmit it is provided. The multiplexing transmission system: accommodates a plurality of client signals of different bit rates including a client signal of a bit rate that is not an integral multiple or an integral submultiple of a bit rate of other client signal, and performs rate adjustment for a part or the whole of the plurality of client signals such that the bit rate of each client signal becomes an integral multiple or integral submultiple of the bit rate of other client signal.Type: ApplicationFiled: September 21, 2007Publication date: July 15, 2010Applicant: Nippon Telegraph and Telephone CorporationInventors: Yoshiaki Kisaka, Shigeki Aisawa, Tetsuo Takahashi, Takuya Ohara, Masafumi Koga, Masahito Tomizawa, Yutaka Miyamoto
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Patent number: 7715717Abstract: The present invention proposes a method whereby during a specified/specifiable observation period (Ttotal) , the polarization states of optical transmission system and/or the optical signals transmitted by the optical transmission system are changed by applying a targeted intervention in at least one position of the transmission line, and at a second position which is interposed at least one place downstream from the first position of the optical transmission line, a specified/specifiable signal characteristic (BER) is qualitatively measured and checked for adherence to a specified/specifiable threshold condition (BERth) and the PMD-induced outage probability of the optical transmission system is calculated on the basis of the ratio between the length of that share of the time (Tout), during which the measured signal characteristic fails to meet the threshold condition (BERth), to the length of the observation period (Ttotal).Type: GrantFiled: September 3, 2004Date of Patent: May 11, 2010Assignees: Deutsche Telekom AG, Nippon Telegraph and Telephone CorporationInventors: Werner Weiershausen, Arnold Mattheus, Ralph Leppla, Yutaka Miyamoto, Akira Hirano, Yoshiaki Kisaka
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Publication number: 20100080245Abstract: A digital transmission system includes at least a client device and a transmission device, and rate-adjusts the client signal transmitted from the client device to the transmission device before accommodating/multiplexing the signal in a frame. The transmission device includes a rate adjusting unit and a frame processing unit. The rate adjusting unit encapsulates the client signal by using a predetermined frame structure, inserts an idle pattern if necessary, and performs rate adjustment into the bit rate which can be contained in the frame. The frame processing unit accommodates/multiplexes the signal after the rate adjustment. The digital transmission system inserts a bit string of the client signal directly in a payload area of the digital frame, or accommodates and multiplexes it. Alternatively, a specific pattern is accommodated in the payload area, or accommodated and multiplexed after performing a reversible digital signal processing.Type: ApplicationFiled: January 16, 2008Publication date: April 1, 2010Inventors: Yoshiaki Kisaka, Takuya Ohara, Shigeki Aisawa, Yutaka Miyamoto, Kazuhito Takei, Yasuyuki Endoh, Yasuyuki Miura, Tadanobu Nikaido, Masahito Tomizawa
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Patent number: 7673383Abstract: An apparatus for manufacturing a complete wire harness from a plurality of wire harnesses have a first transferring unit, an inserting unit and a removing unit. The first transferring unit transfers a wire clamping bar, which holds a partial harness having a plurality of electric wires, to a wire-harness fabricating station. The inserting unit inserts terminals disposed at ends of the plurality of electric wires into predetermined terminal accommodating chambers of predetermined connectors set on a connector receiving jig. The removing unit removes the emptied wire clamping bar.Type: GrantFiled: October 21, 2004Date of Patent: March 9, 2010Assignee: Yazaki CorporationInventors: Yutaka Miyamoto, Shigeji Kudo, Hiroo Suzuki, Tsutomu Nakayama, Jiro Aikawa
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Publication number: 20090162061Abstract: An optical transmission system for performing frequency synchronization even with a client signal with low frequency accuracy, and for transmitting thereof by accommodating/multiplexing without causing a bit slip. A new overhead is added to the entire client signal, and the signal including the new overhead being stuffed is transmitted in conjunction with a plurality of stuffing bits as an optical signal wherein a data storing bit for a negative stuffing, a stuffing information notification bit, and a stuff bits inserting bit for a positive stuffing in the payload are defined in plurality as stuffing bits for adjusting clock frequencies of the client signal in this new overhead.Type: ApplicationFiled: December 21, 2006Publication date: June 25, 2009Inventors: Yoshiaki Kisaka, Shigeki Aisawa, Yutaka Miyamoto, Masahito Tomizawa, Yasuyuki Endoh, Kazuhito Takei
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Patent number: 7542631Abstract: An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal (10) for accepting an electrical binary signal, an amplifier (12) for amplifying said electrical binary signal to the level requested for operating an electrical-optical converter (16) such as a Mach Zehnder light modulator, a bandwidth restriction means (14) which is for instance a low pass filter for restricting bandwidth of said electrical binary signal, and an electrical-optical conversion means (16) such as a Mach Zehnder light modulator for converting electrical signal to optical signal. Because of the location of the low pass filter (14) between an output of the amplifier (12) and the Mach Zehnder light modulator (16), the amplifier (12) may operate in saturation region to provide high level output signal enough for operating the Mach Zehnder light modulator, and a signal shaped by the low pass filter (14) is applied to the Mach Zehnder light modulator (16) with excellent waveform.Type: GrantFiled: April 21, 2008Date of Patent: June 2, 2009Assignee: Nippon Telegraph and Telephone CorporationInventors: Kazushige Yonenaga, Yutaka Miyamoto, Akihiko Matsuura
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Patent number: 7536112Abstract: An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal (10) for accepting an electrical binary signal, an amplifier (12) for amplifying said electrical binary signal to the level requested for operating an electrical-optical converter (16) such as a Mach Zehnder light modulator, a bandwidth restriction means (14) which is for instance a low pass filter for restricting bandwidth of said electrical binary signal, and an electrical-optical conversion means (16) such as a Mach Zehnder light modulator for converting electrical signal to optical signal. Because of the location of the low pass filter (14) between an output of the amplifier (12) and the Mach Zehnder light modulator (16), the amplifier (12) may operate in saturation region to provide high level output signal enough for operating the Mach Zehnder light modulator, and a signal shaped by the low pass filter (14) is applied to the Mach Zehnder light modulator (16) with excellent waveform.Type: GrantFiled: August 28, 2001Date of Patent: May 19, 2009Assignee: Nippon Telegraph and Telephone CorporationInventors: Kazushige Yonenaga, Yutaka Miyamoto, Akihiko Matsuura
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Patent number: 7536108Abstract: The present invention relates to an automatic dispersion compensating optical link system. Carrier suppressed RZ encoded optical signals generated using carrier suppressing means and binary NRZ code or partial response code, or carrier suppressed clock signals generated using carrier suppressing means and clock signals are transmitted on an optical transmission line. Two bands of the carrier suppressed RZ encoded optical signals or carrier suppressed clock signals transmitted on the optical transmission line are each divided into bands and are received. Phase information of the respective basebands is extracted from the binary NRZ code components or partial response code components or clock signals in each band and the relative phase difference thereof is detected. The chromatic dispersion value of the optical transmission line is then calculated from the relative phase difference.Type: GrantFiled: June 26, 2002Date of Patent: May 19, 2009Assignee: Nippon Telegraph & Telephone CorporationInventors: Akira Hirano, Yutaka Miyamoto, Masahito Tomizawa, Shoichiro Kuwahara, Hiroshi Takahashi, Yasuyuki Inoue
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Publication number: 20090097867Abstract: The present invention relates to an optical receiver, in which the transmittance of a Mach-Zehnder interferometer can be locked at a normal operation point in a simple structure and control. A transmittance detecting circuit and a minute modulation signal detecting circuit are provided in parallel after a balanced optical receiver, and a switch is selectively connectable either a minute modulation signal detecting circuit and a transmittance detecting circuit. In the initial stage of frequency pull-in, the switch is set to connect the transmittance detecting circuit to the synchronous detection circuit. If the transmittance detecting circuit detects that the transmittance of the Mach-Zehnder interferometer at the carrier frequency becomes a desired transmittance, the connection of the switch is switched from the transmittance detecting circuit to the minute modulation signal detecting circuit.Type: ApplicationFiled: May 19, 2006Publication date: April 16, 2009Inventors: Mikio Yoneyama, Fumiaki Saitou, Shigeru Ono, Yosuke Takeuchi, Kazushige Yonenaga, Shoichiro Kuwahara, Eiji Yoshida, Yutaka Miyamoto, Hiroto Kawakami