Patents by Inventor Yoshihiro Sanpei
Yoshihiro Sanpei 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: 7864325Abstract: An interferometer of the invention includes: a first splitting element which includes a first transparent medium and a first splitting film formed on the first transparent medium, and which splits incident light into a first split beam and a second split beam, the first split beam being the incident light reflected by the first splitting element and the second split beam being the incident light transmitted through the first splitting element; and a second splitting element which includes a second transparent medium and a second splitting film formed on the second transparent medium, and which causes interference between the first split beam and the second split beam passed through different optical paths, the second splitting element being positioned such that a positional relationship between the second transparent medium and the second splitting film with respect to a direction of incidence on the second splitting element of the first split beam is opposite to a positional relationship between the first trType: GrantFiled: March 25, 2008Date of Patent: January 4, 2011Assignee: Yokogawa Electric CorporationInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Shinji Iio, Morio Wada, Mamoru Hihara, Koki Iemura
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Patent number: 7848662Abstract: A delay interferometer and a demodulator including the delay interferometer and a balanced photodetector are provided. A half mirror splits an optical signal into first and second split beams of light which travel on first and second optical paths, respectively. A first reflector being disposed on the first optical path reflects the first split beam of light toward the half mirror. The second reflector being disposed on the second optical path reflects the second split beam of light toward the half mirror. At least one phase compensator being disposed between the half mirror and at least one of the first and second reflectors includes a medium that exhibits thermooptic effect and has temperature dependency of refractive index. The half mirror couples the first and second split beams of light to generate at least first and second coupled beams of light.Type: GrantFiled: May 3, 2007Date of Patent: December 7, 2010Assignee: Yokogawa Electric CorporationInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Morio Wada, Hiroyuki Matsuura, Akira Miura
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Patent number: 7847952Abstract: An interferometer of the present invention includes: a splitting element which splits an incident light beam into a first split beam and a second split beam; and a first phase compensator which is positioned in an optical path of the first split beam, and which compensates a phase difference occurring between the first split beam and the second split beam upon splitting of the incident light beam by said splitting element.Type: GrantFiled: March 7, 2008Date of Patent: December 7, 2010Assignee: Yokogawa Electric CorporationInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Shinji Iio, Morio Wada
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Publication number: 20090027683Abstract: An interferometer of the invention includes: a first splitting element which includes a first transparent medium and a first splitting film formed on the first transparent medium, and which splits incident light into a first split beam and a second split beam, the first split beam being the incident light reflected by the first splitting element and the second split beam being the incident light transmitted through the first splitting element; and a second splitting element which includes a second transparent medium and a second splitting film formed on the second transparent medium, and which causes interference between the first split beam and the second split beam passed through different optical paths, the second splitting element being positioned such that a positional relationship between the second transparent medium and the second splitting film with respect to a direction of incidence on the second splitting element of the first split beam is opposite to a positional relationship between the first trType: ApplicationFiled: March 25, 2008Publication date: January 29, 2009Applicant: Yokogawa Electric CorporationInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Shinji Iio, Morio Wada, Mamoru Hihara, Koki Iemura
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Publication number: 20080218836Abstract: An interferometer of the present invention includes: a splitting element which splits an incident light beam into a first split beam and a second split beam; and a first phase compensator which is positioned in an optical path of the first split beam, and which compensates a phase difference occurring between the first split beam and the second split beam upon splitting of the incident light beam by said splitting element.Type: ApplicationFiled: March 7, 2008Publication date: September 11, 2008Applicant: Yokogawa Electric CorporationInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Shinji Iio, Morio Wada
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Patent number: 7411725Abstract: A demodulator includes: a Michelson interferometer having: a half-mirror which splits an optical signal, emits a first split light to a first optical path, and emits a second split light to a second optical path; a first reflector which reflects the first split light to the half-mirror; and a second reflector which reflects the second split light to the half-mirror, wherein the half-mirror recombines the first split light and the second split light, and emits a recombined optical signal while splitting the recombined optical signal; and an balanced optical detector which receives the recombined optical signals from the Michelson interferometer, and generates a demodulated signal based on the two recombined optical signals. The length difference between the first optical path and the second optical path is set so that the second split light has a delay time equal to a one-bit period, with respect to the first split light.Type: GrantFiled: November 29, 2006Date of Patent: August 12, 2008Assignee: Yokogawa Electric CorporationInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Morio Wada
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Publication number: 20070264029Abstract: A delay interferometer and a demodulator including the delay interferometer and a balanced photodetector are provided. A half mirror splits an optical signal into first and second split beams of light which travel on first and second optical paths, respectively. A first reflector being disposed on the first optical path reflects the first split beam of light toward the half mirror. The second reflector being disposed on the second optical path reflects the second split beam of light toward the half mirror. At least one phase compensator being disposed between the half mirror and at least one of the first and second reflectors includes a medium that exhibits thermooptic effect and has temperature dependency of refractive index. The half mirror couples the first and second split beams of light to generate at least first and second coupled beams of light.Type: ApplicationFiled: May 3, 2007Publication date: November 15, 2007Applicant: YOKOGAWA ELECTRIC CORPORATIONInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Morio Wada, Hiroyuki Matsuura, Akira Miura
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Publication number: 20070140695Abstract: A demodulator includes: a Michelson interferometer having: a half-mirror which splits an optical signal, emits a first split light to a first optical path, and emits a second split light to a second optical path; a first reflector which reflects the first split light to the half-mirror; and a second reflector which reflects the second split light to the half-mirror, wherein the half-mirror recombines the first split light and the second split light, and emits a recombined optical signal while splitting the recombined optical signal; and an balanced optical detector which receives the recombined optical signals from the Michelson interferometer, and generates a demodulated signal based on the two recombined optical signals. The length difference between the first optical path and the second optical path is set so that the second split light has a delay time equal to a one-bit period, with respect to the first split light.Type: ApplicationFiled: November 29, 2006Publication date: June 21, 2007Inventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Morio Wada
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Patent number: 6999169Abstract: The present invention is intended to realize a spectrometer which improves the wavelength resolution without being affected by the pitch of the photodiode array. The present invention is characterized by a spectrometer which comprises a wavelength dispersion device spectrally dividing the measured light beam and a photodiode array composed of a plurality of photodiodes that detect the spectrally divided light beams by the wavelength dispersion device and output photocurrents, and performs measurement using the outputs of the photodiode array; providing a deflecting means that deflects the measured light beams and changes the position where the measured light beams are detected by the above photodiode array, and measuring the characteristics of the measured light beam from the measured results for different deflection amounts.Type: GrantFiled: December 26, 2002Date of Patent: February 14, 2006Assignee: Yokogawa Electric CorporationInventors: Yoshihiro Sanpei, Makoto Komiyama, Kenji Ogino, Yasuyuki Suzuki, Raiju Okada, Shuuhei Okada
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Patent number: 6885447Abstract: The present invention relates to a spectrometer whereby the accuracy of wavelength measurement can be improved without being affected by the environment of use. The present invention is characterized by improvements made to a spectrometer for spectrally dividing the light under measurement by transmitting the components thereof at different, wavelength-by-wavelength angles, and receiving and detecting the light under measurement thus spectrally divided by the chromatic dispersion device using an optical detector. The apparatus according to the present invention comprises a refractive index compensation means for compensating changes in the angle at which the chromatic dispersion device transmits the light under measurement, according to changes in the refractive index of the medium in which the chromatic dispersion device is placed.Type: GrantFiled: September 3, 2003Date of Patent: April 26, 2005Assignee: Yokogawa Electric CorporationInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Makoto Komiyama, Kenji Ogino, Raiju Okada, Shuuhei Okada, Shin Kamei
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Publication number: 20040075831Abstract: The present invention relates to a spectrometer whereby the accuracy of wavelength measurement can be improved without being affected by the environment of use.Type: ApplicationFiled: September 3, 2003Publication date: April 22, 2004Applicant: YOKOGAWA ELECTRIC CORPORATIONInventors: Yasuyuki Suzuki, Yoshihiro Sanpei, Makoto Komiyama, Kenji Ogino, Raiju Okada, Shuuhei Okada, Shin Kamei
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Publication number: 20030128359Abstract: The present invention is intended to realize a spectrometer which improves the wavelength resolution without being affected by the pitch of the photodiode array. The present invention is characterized by a spectrometer which comprises a wavelength dispersion device spectrally dividing the measured light beam and a photodiode array composed of a plurality of photodiodes that detect the spectrally divided light beams by the wavelength dispersion device and output photocurrents, and performs measurement using the outputs of the photodiode array; providing a deflecting means that deflects the measured light beams and changes the position where the measured light beams are detected by the above photodiode array, and measuring the characteristics of the measured light beam from the measured results for different deflection amounts.Type: ApplicationFiled: December 26, 2002Publication date: July 10, 2003Applicant: YOKOGAWA ELECTRIC CORPORATIONInventors: Yoshihiro Sanpei, Makoto Komiyama, Kenji Ogino, Yasuyuki Suzuki, Raiju Okada, Shuuhei Okada