Patents by Inventor Gentaro Funatsu
Gentaro Funatsu 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: 11808901Abstract: A nuclear reaction detection device 100 includes a semiconductor memory 100 arranged in an environment in which radiation is incident, a position information storage unit 210 that stores spatial position information of a semiconductor element in the semiconductor memory 100, a bit position specifying unit 220 that detects that an SEU (Single Event Upset) has occurred in the semiconductor element included in the semiconductor memory 100, and specifies the semiconductor element in which the SEU has occurred, and a position calculating unit 230 that calculates a spatial position in which the SEU has occurred, based on the specified semiconductor element and the spatial position information.Type: GrantFiled: July 3, 2020Date of Patent: November 7, 2023Assignees: Nippon Telegraph and Telephone Corporation, National University Corporation Hokkaido University, National University Corporation Tokai National Higher Education and Research SystemInventors: Hidenori Iwashita, Gentaro Funatsu, Michihiro Furusaka, Takashi Kamiyama, Hirotaka Sato, Yoshiaki Kiyanagi
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Publication number: 20220260735Abstract: A nuclear reaction detection device includes an FPGA (Field Programmable Gate Array) 100 which is arranged in an environment in which particle radiation is incident, and includes a user circuit 101 configured to output a value different from that in a normal state, if an SEU (Single Event Upset) occurs in a semiconductor element included in the FPGA, and an SEF detection unit 210 which detects that an abnormal operation (SEF) has occurred in the user circuit based on the output value from the user circuit 101 of the FPGA 100.Type: ApplicationFiled: July 3, 2020Publication date: August 18, 2022Inventors: Hidenori IWASHITA, Gentaro FUNATSU, Michihiro FURUSAKA, Takashi KAMIYAMA, Hirotaka SATO, Yoshiaki KIYANAGI
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Publication number: 20220252743Abstract: A nuclear reaction detection device 100 includes a semiconductor memory 100 arranged in an environment in which radiation is incident, a position information storage unit 210 that stores spatial position information of a semiconductor element in the semiconductor memory 100, a bit position specifying unit 220 that detects that an SEU (Single Event Upset) has occurred in the semiconductor element included in the semiconductor memory 100, and specifies the semiconductor element in which the SEU has occurred, and a position calculating unit 230 that calculates a spatial position in which the SEU has occurred, based on the specified semiconductor element and the spatial position information.Type: ApplicationFiled: July 3, 2020Publication date: August 11, 2022Inventors: Hidenori IWASHITA, Gentaro FUNATSU, Michihiro FURUSAKA, Takashi KAMIYAMA, Hirotaka SATO, Yoshiaki KIYANAGI
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Patent number: 8005374Abstract: An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set.Type: GrantFiled: March 12, 2010Date of Patent: August 23, 2011Assignee: Nippon Telegraph and Telephone CorporationInventors: Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Shoichiro Kuwahara, Tomoyoshi Kataoka, Akihide Sano, Gentaro Funatsu
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Patent number: 7792430Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: GrantFiled: April 21, 2008Date of Patent: September 7, 2010Assignees: Fujitsu Limited, Nippon Telegraph & Telephone CorporationInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Publication number: 20100172653Abstract: An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set.Type: ApplicationFiled: March 12, 2010Publication date: July 8, 2010Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Shoichiro Kuwahara, Tomoyoshi Kataoka, Akihide Sano, Gentaro Funatsu
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Patent number: 7734194Abstract: An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set.Type: GrantFiled: March 17, 2005Date of Patent: June 8, 2010Assignee: Nippon Telegraph and Telephone CorporationInventors: Kazushige Yonenaga, Mikio Yoneyama, Masahito Tomizawa, Akira Hirano, Shoichiro Kuwahara, Tomoyoshi Kataoka, Akihide Sano, Gentaro Funatsu
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Patent number: 7664392Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: GrantFiled: April 21, 2008Date of Patent: February 16, 2010Assignees: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Publication number: 20090175616Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: ApplicationFiled: April 21, 2008Publication date: July 9, 2009Applicants: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Publication number: 20080317461Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: ApplicationFiled: April 21, 2008Publication date: December 25, 2008Applicants: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Patent number: 7437069Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: GrantFiled: March 5, 2004Date of Patent: October 14, 2008Assignee: Fujitsu LimitedInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu
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Patent number: 7420666Abstract: In a method for performing OTDR measurement in an optical transmission system including a first terminal station and a second terminal station, OTDR signal light is transmitted from an OTDR provided in the first terminal station to the second terminal station, in which the OTDR signal light is Raman amplified by using main signal light of the optical transmission system as pump light.Type: GrantFiled: April 5, 2007Date of Patent: September 2, 2008Assignees: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Takayuki Maehara, Shinichirou Harasawa, Gentaro Funatsu, Hideki Maeda, Akira Naka
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Publication number: 20070183785Abstract: In a method for performing OTDR measurement in an optical transmission system including a first terminal station and a second terminal station, OTDR signal light is transmitted from an OTDR provided in the first terminal station to the second terminal station, in which the OTDR signal light is Raman amplified by using main signal light of the optical transmission system as pump light.Type: ApplicationFiled: April 5, 2007Publication date: August 9, 2007Applicants: FUJITSU LIMITED, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takayuki Maehara, Shinichirou Harasawa, Gentaro Funatsu, Hideki Maeda, Akira Naka
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Patent number: 7215415Abstract: In a method for performing OTDR measurement in an optical transmission system including a first terminal station and a second terminal station, OTDR signal light is transmitted from an OTDR provided in the first terminal station to the second terminal station, in which the OTDR signal light is Raman amplified by using main signal light of the optical transmission system as pump light.Type: GrantFiled: March 12, 2004Date of Patent: May 8, 2007Assignees: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Takayuki Maehara, Shinichirou Harasawa, Gentaro Funatsu, Hideki Maeda, Akira Naka
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Publication number: 20050110980Abstract: In a method for performing OTDR measurement in an optical transmission system including a first terminal station and a second terminal station, OTDR signal light is transmitted from an OTDR provided in the first terminal station to the second terminal station, in which the OTDR signal light is Raman amplified by using main signal light of the optical transmission system as pump light.Type: ApplicationFiled: March 12, 2004Publication date: May 26, 2005Applicants: Fujitsu Limited, Nippon Telegraph and Telephone CorporationInventors: Takayuki Maehara, Shinichirou Harasawa, Gentaro Funatsu, Hideki Maeda, Akira Naka
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Publication number: 20040213567Abstract: The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed.Type: ApplicationFiled: March 5, 2004Publication date: October 28, 2004Applicants: Fujitsu Limited & Nippon Telegraph, Telephone CorporationInventors: Hiroyuki Deguchi, Shinichirou Harasawa, Hideki Maeda, Akira Naka, Gentaro Funatsu