Patents by Inventor Yusuke Koshikiya

Yusuke Koshikiya 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).

  • Publication number: 20240060817
    Abstract: An object of the present invention is to provide a facility position specification system, a cover, and a facility position specification method capable of specifying a route of an overhead cable without directly giving disturbance to the overhead cable itself.
    Type: Application
    Filed: January 21, 2021
    Publication date: February 22, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Daisuke IIDA, Yusuke KOSHIKIYA, Nazuki HONDA
  • Publication number: 20240035808
    Abstract: The present disclosure relates to an optical fiber strain measurement method including, in order: a strain amount measurement step S2 of measuring a strain amount ?n? of each core wire of an optical fiber ribbon F; a torsion angle calculation step S3 of calculating a torsion angle ? per unit length of the optical fiber ribbon F on the basis of a difference ?? in strain amount between an outer core wire and an inner core wire; a torsional strain amount calculation step S4 of calculating a strain amount ?n caused by torsion of each core wire of the optical fiber ribbon F on the basis of the torsion angle ?; and a tensile strain amount calculation step S5 of subtracting the strain amount ?n from the strain amount ?n?, and calculating a strain amount ??n caused by tension of each core wire of the optical fiber ribbon F.
    Type: Application
    Filed: May 7, 2021
    Publication date: February 1, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Atsushi NAKAMURA, Yusuke KOSHIKIYA, Nazuki HONDA
  • Publication number: 20230400379
    Abstract: The present disclosure relates to a frequency modulation amount measuring device that measures an optical spectral shift of scattered light at a position in an optical transmission line, and calculates a frequency modulation amount at the position, using the measured optical spectral shift.
    Type: Application
    Filed: November 2, 2020
    Publication date: December 14, 2023
    Inventors: Tatsuya OKAMOTO, Daisuke IIDA, Yusuke KOSHIKIYA, Nazuki HONDA
  • Publication number: 20230332980
    Abstract: An object of the present invention is to provide an optical fiber measurement system, an optical fiber measurement method, a control calculation device, and a program that are capable of measuring loss and XT occurring at a plurality of points of an optical fiber in which a plurality of modes propagate, for each point.
    Type: Application
    Filed: October 7, 2020
    Publication date: October 19, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomokazu ODA, Atsushi NAKAMURA, Daisuke IIDA, Yusuke KOSHIKIYA, Nazuki HONDA
  • Patent number: 11385127
    Abstract: An object of the present disclosure is to provide a frequency division multiplexing coherent OTDR, a test method, a signal processing apparatus, and a program that can maintain, even in a case where a DFB laser is used, a spatial resolution equivalent to a spatial resolution achieved when a fiber laser or an external resonant laser is used.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: July 12, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hiroyuki Iida, Tetsuya Manabe, Yusuke Koshikiya, Hidenobu Hirota, Takui Uematsu
  • Patent number: 11199473
    Abstract: An object of the present invention is to provide an optical pulse test apparatus that can test an optical fiber cable at once in a short period of time.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: December 14, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hiroyuki Iida, Tetsuya Manabe, Yusuke Koshikiya, Hidenobu Hirota, Takui Uematsu
  • Patent number: 11112332
    Abstract: An object of the present disclosure is to provide an optical fiber cable monitoring method and an optical fiber cable monitoring system capable of linking information obtained from a measurement result with information stored in a DB and accurately specifying a loss occurrence location on an optical fiber cable. The optical fiber cable monitoring method according to the present disclosure uses two types of optical fiber measurement techniques having different sensitivities. Each of closure locations on the optical fiber cable is acquired with a high-sensitivity measurement technique, and geographical location information and the closure locations on the optical fiber are linked in an arrangement order of the closures. Thus, an operator can recognize an actual location (geographical location information) of a closure that is linked to a location of a point of abnormality on the optical fiber cable when an abnormality in the closure is detected with a low-sensitivity measurement technique.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: September 7, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yusuke Koshikiya, Atsushi Nakamura, Kazutaka Noto, Tetsuya Manabe
  • Publication number: 20210262892
    Abstract: An object of the present disclosure is to provide a frequency division multiplexing coherent OTDR, a test method, a signal processing apparatus, and a program that can maintain, even in a case where a DFB laser is used, a spatial resolution equivalent to a spatial resolution achieved when a fiber laser or an external resonant laser is used.
    Type: Application
    Filed: June 12, 2019
    Publication date: August 26, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hiroyuki IIDA, Tetsuya MANABE, Yusuke KOSHIKIYA, Hidenobu HIROTA, Takui UEMATSU
  • Publication number: 20210239567
    Abstract: An object of the present invention is to provide an optical pulse test apparatus that can test an optical fiber cable at once in a short period of time.
    Type: Application
    Filed: June 4, 2019
    Publication date: August 5, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hiroyuki IIDA, Tetsuya MANABE, Yusuke KOSHIKIYA, Hidenobu HIROTA, Takui UEMATSU
  • Publication number: 20210003474
    Abstract: An object of the present disclosure is to provide an optical fiber cable monitoring method and an optical fiber cable monitoring system capable of linking information obtained from a measurement result with information stored in a DB and accurately specifying a loss occurrence location on an optical fiber cable. The optical fiber cable monitoring method according to the present disclosure uses two types of optical fiber measurement techniques having different sensitivities. Each of closure locations on the optical fiber cable is acquired with a high-sensitivity measurement technique, and geographical location information and the closure locations on the optical fiber are linked in an arrangement order of the closures. Thus, an operator can recognize an actual location (geographical location information) of a closure that is linked to a location of a point of abnormality on the optical fiber cable when an abnormality in the closure is detected with a low-sensitivity measurement technique.
    Type: Application
    Filed: March 5, 2019
    Publication date: January 7, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yusuke KOSHIKIYA, Atsushi NAKAMURA, Kazutaka NOTO, Tetsuya MANABE
  • Patent number: 8928868
    Abstract: A test pulse is generated from a first and a second test light beam pulse with different wavelengths, with a predetermined time difference applied between the first and the second test light beam pulse. A circulator inputs the test pulse to a trunk fiber of a measurement target fiber line. A reflected light is extracted which is output from an input end of the trunk fiber. A filter extracts stimulated Brillouin backscattered light. A receiver receives and converts the scattered light into an electrical signal. A processing device carries out the signal to determine in which of N branched fibers the stimulated Brillouin scattered light is generated, while varying a time difference between the first and the second test pulse.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: January 6, 2015
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Hiroshi Takahashi, Fumihiko Ito, Xinyu Fan, Yusuke Koshikiya
  • Publication number: 20140098362
    Abstract: A test pulse is generated from a first and a second test light beam pulse with different wavelengths, with a predetermined time difference applied between the first and the second test light beam pulse. A circulator inputs the test pulse to a trunk fiber of a measurement target fiber line. A reflected light is extracted which is output from an input end of the trunk fiber. A filter extracts stimulated Brillouin backscattered light. A receiver receives and converts the scattered light into an electrical signal. A processing device carries out the signal to determine in which of N branched fibers the stimulated Brillouin scattered light is generated, while varying a time difference between the first and the second test pulse.
    Type: Application
    Filed: May 31, 2012
    Publication date: April 10, 2014
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hiroshi Takahashi, Fumihiko Ito, Xinyu Fan, Yusuke Koshikiya
  • Patent number: 8149419
    Abstract: An object of the invention is to provide an optical reflectometry and an optical reflectometer, in which accurate measurement can be performed irrespective of a measurement distance. In the optical reflectometry and optical reflectometer according to the invention, in which a distribution of backscattered light intensity from a measurement target in an optical propagation direction is measured using Optical Frequency Domain Reflectometry (OFDR), a coherence monitor unit 12 that monitors a coherence property of a frequency sweep light source 1 is provided, and measurement result of a measuring unit 11 is corrected based on the monitor result of the coherence monitor unit 12.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: April 3, 2012
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Xinyu Fan, Fumihiko Ito, Yusuke Koshikiya
  • Publication number: 20100097615
    Abstract: An object of the invention is to provide an optical reflectometry and an optical reflectometer, in which accurate measurement can be performed irrespective of a measurement distance. In the optical reflectometry and optical reflectometer according to the invention, in which a distribution of backscattered light intensity from a measurement target in an optical propagation direction is measured using Optical Frequency Domain Reflectometry (OFDR), a coherence monitor unit 12 that monitors a coherence property of a frequency sweep light source 1 is provided, and measurement result of a measuring unit 11 is corrected based on the monitor result of the coherence monitor unit 12.
    Type: Application
    Filed: February 21, 2008
    Publication date: April 22, 2010
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Xinyu Fan, Fumihiko Ito, Yusuke Koshikiya