Patents by Inventor Tsuyoshi Yakihara
Tsuyoshi Yakihara 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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Publication number: 20070047956Abstract: Disclosed is a repeater including: a recognizing unit to recognize a destination address of an optical packet from the optical packet which includes the destination address assigned in unit of bit and a bit indicating whether or not a plurality of destination addresses are assigned; an optical splitting unit to split the optical packet into a plurality of optical packets; and selecting units to select transmission channels for the split optical packets on the basis of recognition results by the recognizing units, respectively.Type: ApplicationFiled: April 12, 2006Publication date: March 1, 2007Inventors: Hiroshi Shimizu, Katsuya Ikezawa, Akira Toyama, Yasukazu Akasaka, Kanji Tatsumi, Chie Sato, Hirotoshi Kodaka, Tadashige Fujita, Tsuyoshi Yakihara, Daisuke Hayashi, Masayuki Suehiro, Shinji Iio, Morio Wada, Akira Miura
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Publication number: 20070047957Abstract: An optical packet network system of a ring type, capable of preventing degradation of an optical signal, can be implemented by providing a mechanism relatively simple in structure, capable of erasing light noise if the optical packet signal does not exists. In the optical packet network system made up by interconnecting respective nodes adjacent to each other, and connecting a sending source of an optical packet signal to a ring, a light noise removal function block is provided between the respective nodes adjacent to each other.Type: ApplicationFiled: August 11, 2006Publication date: March 1, 2007Applicant: YOKOGAWA ELECTRIC CORPORATIONInventors: Shinji Iio, Masayuki Suehiro, Katsuya Ikezawa, Akira Miura, Sadaharu Oka, Chie Sato, Mamoru Hihara, Tsuyoshi Yakihara, Shin-ichi Nakajima, Morio Wade, Daisuke Hayashi, Shinji Kobayashi, Yoshiyuki Asano
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Patent number: 7176437Abstract: A photoelectric apparatus has a phototransistor which receives a light signal and in which a collector current thereof varies according to intensity of the received light signal, and a transistor in which a collector current thereof varies according to a base voltage thereof. The phototransistor and the transistor constitute a differential amplification circuit. At least one of the phototransistor and the transistor outputs an electric signal.Type: GrantFiled: February 23, 2005Date of Patent: February 13, 2007Assignee: Yokogawa Electric CorporationInventors: Morio Wada, Akira Miura, Tsuyoshi Yakihara, Sadaharu Oka, Chie Sato, Katsuya Ikezawa, Shinji Kobayashi, Shinji Iio, Daisuke Hayashi
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Publication number: 20070019695Abstract: An optical AND element includes a semiconductor laser having a plurality of saturable absorption regions on an optical waveguide, electrodes of the saturable absorption regions being separated from each other, and a light inputting section for inputting light into the respective saturable absorption regions.Type: ApplicationFiled: July 17, 2006Publication date: January 25, 2007Inventors: Shinji Iio, Masayuki Suehiro, Chie Sato, Morio Wada, Katsuya Ikezawa, Daisuke Hayashi, Akira Miura, Tsuyoshi Yakihara, Shinji Kobayashi, Sadaharu Oka
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Publication number: 20070003202Abstract: An optical waveform shaping device includes a first waveguide portion, formed on a substrate, for transmitting the optical signal and simultaneously absorbing a portion of the optical signal, which has a signal level equal to or smaller than a predetermined value, so as to shape the optical signal; and a second waveguide portion, formed on the substrate, for transmitting the optical signal, which was transmitted through the first waveguide portion, and simultaneously amplifying the optical signal. The first waveguide portion may be formed using a saturable absorber. A first electrode for supplying electric current to the first waveguide portion so that the first waveguide portion is provided with a function of absorbing the optical signal; and a second electrode for supplying electric current to the second waveguide portion so that the second waveguide portion is provided with a function of amplifying the optical signal may also be provided.Type: ApplicationFiled: May 22, 2006Publication date: January 4, 2007Inventors: Shinji Iio, Machio Dobashi, Chie Sato, Morio Wada, Katsuya Ikezawa, Akira Miura, Tsuyoshi Yakihara, Shinji Kobayashi, Sadaharu Oka
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Publication number: 20060290928Abstract: A photodiode array for entering incident light a spectroscope device equipped with a wavelength dispersion element and detecting light emanating from the spectroscope device. The arrangement of each of photodiode elements constituting the photodiode array is displaced.Type: ApplicationFiled: June 8, 2006Publication date: December 28, 2006Inventors: Tadashige Fujita, Yasuyuki Suzuki, Shin Kamei, Tsuyoshi Yakihara, Morio Wada, Akira Miura
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Patent number: 7116856Abstract: A matrix optical switch that can switch the transmission path of an optical signal without requiring a driving unit for each optical switch is realized. A matrix optical switch for switching a transmission path of an optical signal by connecting plural input sides and plural output sides, respectively, comprises: a semiconductor optical waveguide substrate; a photo mask choosing system for selecting and arranging one photo mask from plural photo masks each of which has printed thereon a pattern connecting plural input sides to plural output sides; and a light source for casting output light having larger energy than a band gap of the semiconductor optical waveguide substrate onto a photon injection area between the plural input sides and the plural output sides on the semiconductor optical waveguide substrate via the selected photo mask.Type: GrantFiled: July 29, 2004Date of Patent: October 3, 2006Assignee: Yokogawa Electric CorporationInventors: Shinji Iio, Masayuki Suehiro, Shin-ichi Nakajima, Yoshiyuki Asano, Chie Sato, Akira Miura, Tsuyoshi Yakihara, Shinji Kobayashi, Sadaharu Oka
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Patent number: 7113665Abstract: An optical router capable of efficiently allocating optimum optical paths to optical signals at optimum timings is provided in accordance with the present invention. The optical router is capable of delaying a plurality of the optical signals containing routing information attached to the header parts thereof. The optical router contains an optical switch which has a plurality of input and output ports; an optical-electrical converter for converting a plurality of the optical signals to electrical signals; memory wherein path control information and delay time information are stored; and a controller for generating an electrical routing control signal which can change the optical path of the optical signals by finding the path control information according to the routing information extracted from the output of the optical-electrical converter and which can delay the electrical routing control.Type: GrantFiled: January 26, 2004Date of Patent: September 26, 2006Assignee: Yokogawa Electric CorporationInventors: Chie Sato, Shinji Iio, Shinji Kobayashi, Sadaharu Oka, Tsuyoshi Yakihara, Akira Miura
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Publication number: 20060165348Abstract: An optical switch changes over transmission paths of an optical signal by a refractive index change. The optical switch has an optical waveguide layer having an optical waveguide whose output path of an optical signal branches into two, and reflection diffusing ditches which are provided in a portion outside the optical waveguide in the optical waveguide layer, wherein the portion is closed to a branch portion of the optical waveguides. The reflection diffusing ditches extend in a direction crossing a traveling direction of the optical signal.Type: ApplicationFiled: December 21, 2005Publication date: July 27, 2006Inventors: Shinji Iio, Masayuki Suehiro, Shinichi Nakajima, Yoshiyuki Asano, Chie Sato, Morio Wada, Akira Miura, Tsuyoshi Yakihara, Shinji Kobayashi, Sadaharu Oka, Mamoru Hihara, Katsuya Ikezawa
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Patent number: 7035490Abstract: When a voltage is applied to plural spot electrodes selected from the spot electrodes arranged in the matrix form and the light incident on the two-dimensional plane waveguide is reflected by at least two parallel lines, the refractive index of the optical waveguide is partly changed so that the wavelength of the light, the angle of the two lines to the incident light and the distance between the lines satisfy the Bragg reflection condition.Type: GrantFiled: April 19, 2004Date of Patent: April 25, 2006Assignee: Yokogawa Electric Corp.Inventors: Shun-ichi Miyazaki, Akira Miura, Shinji Kobayashi, Morio Wada, Tsuyoshi Yakihara, Sadaharu Oka, Shinji Iio, Tadashige Fujita, Chie Sato
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Publication number: 20060034735Abstract: A microreactor has a plurality of flow channels and a joint flow channel where the plurality of flow channels are joined. Fluids flowing through the plurality of flow channels join in the joint flow channel to react with each other. The microreactor further has an ultrasonic wave oscillation section which applies an ultrasonic wave to the joint flow channel.Type: ApplicationFiled: August 9, 2005Publication date: February 16, 2006Inventors: Akira Miura, Morio Wada, Tsuyoshi Yakihara, Shinji Kobayashi
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Publication number: 20060034736Abstract: A microreactor has a plurality of flow channels, a joint flow channel where the plurality of flow channels are joined, a light applying section which applies light, that accelerates a reaction of fluids which flows through the plurality of flow channels to join in the joint flow channel, to the joint flow channel; and an applying section which applies a magnetic field and/or an electric field to a reaction production substance.Type: ApplicationFiled: August 9, 2005Publication date: February 16, 2006Inventors: Akira Miura, Morio Wada, Tsuyoshi Yakihara, Katsuya Ikezawa, Sadaharu Oka, Shinji Kobayashi
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Publication number: 20060013105Abstract: A light signal switching apparatus has an input port and output ports, and outputs an output light from a desired output port. The apparatus has a splitter polarizing an input light into first and second polarized light whose polarization planes are different mutually by 90 degrees, a first polarization controller rotating a polarization plane of the second polarized light by 90 degrees to output a third polarized light, a first optical switch switching a path of the first polarized light to the desired output port side, a second optical switch switching a path of the third polarized light to the desired output port side, a second polarization controller rotating a polarization plane of the first polarized light by 90 degrees to output a fourth polarized light, and a combiner combining the third polarized light with the fourth polarized light, to output a combined light to the desired output port.Type: ApplicationFiled: July 7, 2005Publication date: January 19, 2006Inventors: Morio Wada, Shinji Iio, Masayuki Suehiro, Shinichi Nakajima, Yoshiyuki Asano, Tsuyoshi Yakihara, Akira Miura
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Publication number: 20060011819Abstract: A variable light signal delay apparatus includes a first delay optical fiber, a second delay optical fiber having a length different from the first delay optical fiber, and an optical switch having two input ports, two output ports, and paths, through which a light signal propagates, provided between the first delay optical fiber and the second delay optical fiber, in which a light signal input from at least one of the input ports propagated through either the first delay optical fiber or the second delay optical fiber or through neither the first delay optical fiber nor the second delay optical fiber to be output from a desired first output port.Type: ApplicationFiled: June 29, 2005Publication date: January 19, 2006Inventors: Morio Wada, Akira Miura, Chie Sato, Katsuya Ikezawa, Tsuyoshi Yakihara
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Publication number: 20050207692Abstract: An optical switch has an optical waveguide whose output path of an optical signal branches into two, a carrier injection section which is provided to a branch portion of the optical waveguide and to which carriers are injected, and a refractive index change section which is provided to a optical waveguide layer of the optical waveguide and in which a refractive index changes in a case that carrier are injected to the carrier injection section, wherein the refractive index change section includes a quantum well layer.Type: ApplicationFiled: March 4, 2005Publication date: September 22, 2005Inventors: Morio Wada, Shoujirou Araki, Machio Dobashi, Shinji Iio, Masayuki Suehiro, Yoshiyuki Asano, Shinichi Nakajima, Tsuyoshi Yakihara, Akira Miura
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Publication number: 20050194519Abstract: An optical logic device performs a logic operation on a plurality of input light signals. The optical logic device has a photoelectric conversion portion, in which photoreceivers for receiving input light signals are provided in parallel, that outputs an electric signal obtained by adding up outputs of the photoreceivers, and a comparator that compares a voltage level of the electric signal outputted from the photoelectric conversion portion with a predetermined voltage level.Type: ApplicationFiled: March 2, 2005Publication date: September 8, 2005Inventors: Morio Wada, Akira Miura, Tsuyoshi Yakihara, Masayuki Suehiro, Daisuke Hayashi, Shinji Iio, Toshimasa Umezawa, Takahiro Kudo, Takashi Mogi, Shoujirou Araki, Machio Dobashi, Katsuya Ikezawa
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Publication number: 20050194518Abstract: A photoelectric apparatus has a phototransistor which receives a light signal and in which a collector current thereof varies according to intensity of the received light signal, and a transistor in which a collector current thereof varies according to a base voltage thereof. The phototransistor and the transistor constitute a differential amplification circuit. At least one of the phototransistor and the transistor outputs an electric signal.Type: ApplicationFiled: February 23, 2005Publication date: September 8, 2005Inventors: Morio Wada, Akira Miura, Tsuyoshi Yakihara, Sadaharu Oka, Chie Sato, Katsuya Ikezawa, Shinji Kobayashi, Shinji Iio, Daisuke Hayashi
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Patent number: 6930623Abstract: The present invention aims at achieving an optical signal processing system which converts a higher speed optical signal to electrical signals by time-demultiplexing the signal with low-speed electrical signals. The present invention offers an improved optical signal processing system that converts a serial pulse train optical signal with transmission speed N to parallel pulse train electrical signals.Type: GrantFiled: January 22, 2004Date of Patent: August 16, 2005Assignee: Yokogawa Electric CorporationInventors: Shinji Iio, Masayuki Suehiro, Shin-ichi Nakajima, Yoshiyuki Asano, Hiroyuki Matsuura, Akira Miura, Tsuyoshi Yakihara, Shinji Kobayashi, Sadaharu Oka, Hirotoshi Kodaka
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Publication number: 20050134297Abstract: An optical sampling apparatus has an electron beam generating apparatus which generates an electron beam by irradiating a cathode with an optical signal, a deflection electrode which deflects the generated electron beam, a sampling slit which transmits a part of the deflected electron beam, and a charge detection section which detects the quantity of charges or accumulated current of the transmitted electron beam. It is possible to perform accurate sampling in a high band.Type: ApplicationFiled: December 1, 2004Publication date: June 23, 2005Inventors: Kentaro Tezuka, Tsuyoshi Yakihara, Sadaharu Oka, Shinji Kobayashi, Akira Miura
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Publication number: 20050129352Abstract: An optical path control device includes a hole formed perpendicularly to the plane of a substrate, an optical waveguide formed on the substrate to cover the hole, an upper electrode formed on the optical waveguide above the hole, a lower electrode formed on a bottom part of the hole, and a voltage application unit for applying a voltage between the upper and lower electrodes. As the applied voltage is controlled to change an electrostatic attraction force between the upper and lower electrodes and the magnitude of flexure of the waveguide is thus changed, the traveling direction of light can be changed into an arbitrary direction.Type: ApplicationFiled: July 29, 2004Publication date: June 16, 2005Applicant: YOKOGAWA ELECTRIC CORPORATIONInventors: Shun-ichi Miyazaki, Akira Miura, Shinji Kobayashi, Tadashige Fujita, Chie Sato, Tsuyoshi Yakihara, Sadaharu Oka, Takashi Suzuki