Patents by Inventor Satoshi Kajiya
Satoshi Kajiya 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: 11342724Abstract: A semiconductor optical integrated device comprises a semiconductor amplifier and a plurality of semiconductor lasers, wherein the semiconductor amplifier and the semiconductor lasers are monolithically integrated on a semiconductor substrate, an n-side cladding layer of the semiconductor amplifier and an n-side cladding layer of each of the semiconductor lasers are electrically insulated by an insulating layer formed between the semiconductor substrate and the n-side cladding layer of the semiconductor lasers and an insulating layer formed between the n-side cladding layer of the semiconductor amplifier and the n-side cladding layer of the semiconductor lasers, the n-side cladding layer of the semiconductor lasers and the p-side cladding layer of the semiconductor amplifier is configured to be electrically connected, and the semiconductor amplifier and each semiconductor laser of the plurality of semiconductor lasers are electrically connected in series.Type: GrantFiled: April 23, 2018Date of Patent: May 24, 2022Assignee: Mitsubishi Electric CorporationInventors: Keisuke Matsumoto, Eitaro Ishimura, Satoshi Kajiya, Satoshi Nishikawa
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Publication number: 20210044082Abstract: A semiconductor optical integrated device comprises a semiconductor amplifier and a plurality of semiconductor lasers, wherein the semiconductor amplifier and the semiconductor lasers are monolithically integrated on a semiconductor substrate, an n-side cladding layer of the semiconductor amplifier and an n-side cladding layer of each of the semiconductor lasers are electrically insulated by an insulating layer formed between the semiconductor substrate and the n-side cladding layer of the semiconductor lasers and an insulating layer formed between the n-side cladding layer of the semiconductor amplifier and the n-side cladding layer of the semiconductor lasers, the n-side cladding layer of the semiconductor lasers and the p-side cladding layer of the semiconductor amplifier is configured to be electrically connected, and the semiconductor amplifier and each semiconductor laser of the plurality of semiconductor lasers are electrically connected in series.Type: ApplicationFiled: April 23, 2018Publication date: February 11, 2021Applicant: Mitsubishi Electric CorporationInventors: Keisuke MATSUMOTO, Eitaro ISHIMURA, Satoshi KAJIYA, Satoshi NISHIKAWA
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Patent number: 9484708Abstract: A laser module includes a light source device having a first amplifier that outputs first output light, and a second amplifier that outputs second output light, a first drive circuit that supplies the first amplifier with a first drive current, a second drive circuit that supplies the second amplifier with a second drive current. A dither signal is superimposed on one of two drive currents to respectively grasp the characteristics of the two amplifiers.Type: GrantFiled: October 19, 2015Date of Patent: November 1, 2016Assignee: Mitsubishi Electric CorporationInventors: Satoshi Kajiya, Tetsuhiro Fukao
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Publication number: 20160204568Abstract: A laser module includes a light source device having a first amplifier that outputs first output light, and a second amplifier that outputs second output light, a first drive circuit that supplies the first amplifier with a first drive current, a second drive circuit that supplies the second amplifier with a second drive current. A dither signal is superimposed on one of two drive currents to respectively grasp the characteristics of the two amplifiers.Type: ApplicationFiled: October 19, 2015Publication date: July 14, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Satoshi KAJIYA, Tetsuhiro FUKAO
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Publication number: 20130343767Abstract: An optical transmitter includes an equalizer which receives a data signal, an optical modulator driver which amplifies an output signal of the equalizer, and an optical modulator which converts an output signal of the optical modulator driver into an optical signal and outputs the optical signal. The equalizer has a signal line for transmitting the data signal, a coupled line electromagnetically coupled to the signal line, a resistive section connected to the coupled line, and a ground via connected to the resistive section. The equalizer reduces power of the data signal in a frequency range where the frequency response characteristic of the optical modulator driver exhibits peaking, to reduce waveform jitter in the output signal of the optical modulator driver that is input to the optical modulator.Type: ApplicationFiled: June 3, 2013Publication date: December 26, 2013Inventors: Satoshi Kajiya, Tatsuo Hatta, Yuto Ueno
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Publication number: 20120153132Abstract: An element carrier has a mounting surface where at least one element outputting a high-frequency signal is disposed. A first dielectric layer has a first side surface partially forming the mounting surface and a first main surface connecting to the first side surface and extending in an intersecting direction intersecting with the mounting surface. A first wiring pattern is provided on the first main surface and extends from the first side surface. A second dielectric layer has a second side surface partially forming the mounting surface and a second main surface connecting to the second side surface and extending in the intersecting direction, and is provided on a part of the first main surface of the first dielectric layer where the first wiring pattern is provided. A second wiring pattern is provided on the second main surface of the second dielectric layer and extends from the second side surface.Type: ApplicationFiled: November 17, 2011Publication date: June 21, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yuichiro Horiguchi, Kohei Sugihara, Yasuhisa Shimakura, Toshiharu Miyahara, Satoshi Kajiya, Satoshi Nishikawa, Eiji Yagyu
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Patent number: 7269349Abstract: Two signal lights having different wavelengths are bidirectionally transmitted on an optical-fiber transmission-line. A Raman pump light source generates a first Raman pump light having predetermined wavelengths with a Raman gain-bandwidth for amplifying the first signal light and without response to the second signal light. Another Raman pump light source generates a second Raman pump light having predetermined wavelengths with a Raman gain-bandwidth for amplifying the second signal light and without response to the first signal light. The first Raman pump light and the second Raman pump light are differently injected from respective input/output terminals into the optical-fiber transmission-line by optical combining and branching filters.Type: GrantFiled: April 18, 2002Date of Patent: September 11, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kaoru Kinjo, Satoshi Kajiya, Takashi Mizuochi
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Patent number: 7092643Abstract: The optical transmission apparatus has a Mach-Zehnder optical modulator, a light source for applying an optical signal of a continuous light to the optical modulator, a driving circuit for inputting a driving signal into the optical modulator, a branching filter for taking out a part of an output optical signal, a photodiode for converting the taken-out output optical signal into an electric signal, a band pass filter for extracting a frequency component of a driving signal included in this electric signal, an error signal generator circuit for generating an error signal of a bias voltage that minimizes a value of the extracted frequency component, and a bias voltage control circuit for applying a bias voltage added with this error signal to the optical modulator.Type: GrantFiled: June 28, 2001Date of Patent: August 15, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoshi Kajiya, Kazuyuki Ishida, Katsuhiro Shimizu, Yukio Kobayashi
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Patent number: 7068421Abstract: An optical fiber propagates and amplifies a second signal light that is a wavelength-multiplexed signal of a first signal light of a plurality of wavelengths and a reference light that is out of a wavelength range of amplification. An excitation light source outputs an excitation light for amplifying the second signal light. A beam splitter splits a portion of the second signal light into the first signal light and the reference light. A signal light level detecting unit detects a level of the first signal light. A reference light level detecting unit detects a level of the reference light. A signal level setting unit calculates a target value for constantly maintaining a Raman gain, and controls the output level of the excitation light in such a way that the first signal level matches with the target value.Type: GrantFiled: September 4, 2003Date of Patent: June 27, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshiyuki Tokura, Taichi Kogure, Satoshi Kajiya, Takashi Mizuochi
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Patent number: 7057802Abstract: The optical amplifier apparatus comprises an optical amplifier (3) which amplifies an input signal light, an output detecting unit (5) which detects an output level of the optical amplifier, an output control unit (6) which controls an output level of the optical amplifier according to an output level detected by the output detecting unit (5), a gain inclination detecting unit (7) which detects a gain inclination relating to a wavelength of the optical amplifier, and a gain inclination control unit (8) which controls a gain inclination of the optical amplifier (3) according to a gain inclination detected by the gain inclination detecting unit (7).Type: GrantFiled: June 25, 2001Date of Patent: June 6, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoshi Kajiya, Katsuhiro Shimizu, Takahiko Itoh
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Patent number: 7034993Abstract: The optical amplifier apparatus comprises an optical amplifier which amplifies an input signal light, an output detecting unit which detects an output level of the optical amplifier, an output control unit which controls an output level of the optical amplifier according to an output level detected by the output detecting unit, a gain inclination detecting unit which detects a gain inclination relating to a wavelength of the optical amplifier, and a gain inclination control unit which controls a gain inclination of the optical amplifier according to a gain inclination detected by the gain inclination detecting unit.Type: GrantFiled: June 8, 2005Date of Patent: April 25, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoshi Kajiya, Katsuhiro Shimizu, Takahiko Itoh
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Patent number: 7016614Abstract: An optical repeater is provided between a first optical fiber transmission path and a second optical fiber transmission path having a zero-dispersion wavelength different from the first optical fiber transmission path. This optical repeater wave-converts a wavelength division multiplex signal input from the first optical fiber transmission path with respect to respective wavelengths thereof, and outputs the wave-converted signal to the second optical fiber transmission path.Type: GrantFiled: November 28, 2000Date of Patent: March 21, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoshi Kajiya, Katsuhiro Shimizu, Yukio Kobayashi, Takashi Mizuochi
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Patent number: 6970650Abstract: In a one-fiber bidirectional optical transmission system in which output optical signals of optical transmitter-receivers respectively connected to the opposite ends of one optical fiber transmission line are bidirectionally transmitted in the optical fiber transmission line, which utilizes a Raman amplification effect by backward pumping, a frequency satisfying the conditions of |fs1?f0|?|fp2?f0| and |fs2?f0|?|fp1?f0| is selected, where f0 is a zero dispersion frequency of the optical fiber transmission line, fs1 and fs2 are the frequencies of the first signal and the second signal, respectively, and fp1 and fp2 are frequencies of the first Raman pump light and the second Raman pump light, respectively.Type: GrantFiled: February 26, 2003Date of Patent: November 29, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Satoshi Kajiya, Kaoru Kinjo, Takashi Mizuochi
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Publication number: 20050225844Abstract: The optical amplifier apparatus comprises an optical amplifier which amplifies an input signal light, an output detecting unit which detects an output level of the optical amplifier, an output control unit which controls an output level of the optical amplifier according to an output level detected by the output detecting unit, a gain inclination detecting unit which detects a gain inclination relating to a wavelength of the optical amplifier, and a gain inclination control unit which controls a gain inclination of the optical amplifier according to a gain inclination detected by the gain inclination detecting unit.Type: ApplicationFiled: June 8, 2005Publication date: October 13, 2005Inventors: Satoshi Kajiya, Katsuhiro Shimizu, Takahiko Itoh
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Publication number: 20050099676Abstract: An optical fiber propagates and amplifies a second signal light that is a wavelength-multiplexed signal of a first signal light of a plurality of wavelengths and a reference light that is out of a wavelength range of amplification. An excitation light source outputs an excitation light for amplifying the second signal light. A beam splitter splits a portion of the second signal light into the first signal light and the reference light. A signal light level detecting unit detects a level of the first signal light. A reference light level detecting unit detects a level of the reference light. A signal level setting unit calculates a target value for constantly maintaining a Raman gain, and controls the output level of the excitation light in such a way that the first signal level matches with the target value.Type: ApplicationFiled: September 4, 2003Publication date: May 12, 2005Inventors: Toshiyuki Tokura, Taichi Kogure, Satoshi Kajiya, Takashi Mizuochi
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Publication number: 20040161214Abstract: In a one-fiber bidirectional optical transmission system in which output optical signals of optical transmitter-receivers respectively connected to the opposite ends of one optical fiber transmission line are bidirectionally transmitted in the optical fiber transmission line, which utilizes a Raman amplification effect by backward pumping, a frequency satisfying the conditions of |fs1−f0|≠|fp2−f0| and |fs2−f0|≠|fp1−f0| is selected, where f0 is a zero dispersion frequency of the optical fiber transmission line, fs1 and fs2 are the frequencies of the first signal and the second signal, respectively, and fp1 and fp2 are frequencies of the first Raman pump light and the second Raman pump light, respectively.Type: ApplicationFiled: November 13, 2003Publication date: August 19, 2004Inventors: Satoshi Kajiya, Kaoru Kinjo, Takashi Mizuochi
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Publication number: 20030137721Abstract: The optical amplifier apparatus comprises an optical amplifier (3) which amplifies an input signal light, an output detecting unit (5) which detects an output level of the optical amplifier, an output control unit (6) which controls an output level of the optical amplifier according to an output level detected by the output detecting unit (5), a gain inclination detecting unit (7) which detects a gain inclination relating to a wavelength of the optical amplifier, and a gain inclination control unit (8) which controls a gain inclination of the optical amplifier (3) according to a gain inclination detected by the gain inclination detecting unit (7).Type: ApplicationFiled: February 27, 2002Publication date: July 24, 2003Inventors: Satoshi Kajiya, Katsuhiro Shimizu, Takahiko Itoh
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Publication number: 20030081290Abstract: Two signal lights having different wavelengths are bidirectionally transmitted on an optical-fiber transmission-line. A Raman pump light source generates a first Raman pump light having predetermined wavelengths with a Raman gain-bandwidth for amplifying the first signal light and without response to the second signal light. Another Raman pump light source generates a second Raman pump light having predetermined wavelengths with a Raman gain-bandwidth for amplifying the second signal light and without response to the first signal light. The first Raman pump light and the second Raman pump light are differently injected from respective input/output terminals into the optical-fiber transmission-line by optical combining and branching filters.Type: ApplicationFiled: April 18, 2002Publication date: May 1, 2003Inventors: Kaoru Kinjo, Satoshi Kajiya, Takashi Mizuochi
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Publication number: 20020001116Abstract: The optical transmission apparatus has a Mach-Zehnder optical modulator, a light source for applying an optical signal of a continuous light to the optical modulator, a driving circuit for inputting a driving signal into the optical modulator, a branching filter for taking out a part of an output optical signal, a photodiode for converting the taken-out output optical signal into an electric signal, a band pass filter for extracting a frequency component of a driving signal included in this electric signal, an error signal generator circuit for generating an error signal of a bias voltage that minimizes a value of the extracted frequency component, and a bias voltage control circuit for applying a bias voltage added with this error signal to the optical modulator.Type: ApplicationFiled: June 28, 2001Publication date: January 3, 2002Inventors: Satoshi Kajiya, Kazuyuki Ishida, Katsuhiro Shimizu, Yukio Kobayashi
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Patent number: 5721331Abstract: An isobutylene-based polymer as a polymer of cationically polymerizable monomers principally composed of isobutylene or a combination of isobutylene and a styrene-series monomer, generates a molded article with outstanding properties, the isobutylene-based polymer characteristically satisfying the following provisions;1. the isobutylene-based polymer has a substantially continuos molecular weight distribution on a gel-permeation chromatogram;2. the molecular weight at the highest peak on a gel-permeation chromatogram is within a range of 10,000 to 500,000; and3. the length (a) of the elution time in the lower molecular region of the mountain from the highest peak and the length (b) of the elution time in the higher molecular region of the mountain from the highest peak on a gel-permeation chromatogram, satisfy the provision represented by the formula (b)/(a).gtoreq.1.3.Type: GrantFiled: March 5, 1996Date of Patent: February 24, 1998Assignee: Kuraray Co., Ltd.Inventors: Kenji Shachi, Satoshi Kajiya, Kazushige Ishiura