Patents by Inventor Yasuko SUGIMOTO

Yasuko SUGIMOTO 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).

  • Method of measuring cut-off wavelength of optical fiber
    Patent number: 8896822
    Abstract: A cut-off wavelength measuring method according to the present invention includes: preparing a single mode fiber as a reference fiber; preparing a measurement target fiber; adjusting the length of the single mode fiber such that the length of the single mode fiber is longer than the that of the measurement target fiber at the time of measuring power of transmission light and the reference fiber propagates only light of a base mode at a predicted cut-off wavelength of the measurement target fiber; measuring wavelength dependence of power of light transmitted through the reference fiber and wavelength dependence of power of light transmitted through the measurement target fiber; and calculating a cut-off wavelength of the measurement target fiber based on wavelength dependence represented as the ratio of the power of transmission light transmitted through the measurement target fiber to the power of light transmitted through the reference fiber.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: November 25, 2014
    Assignee: Fujikura Ltd.
    Inventors: Yasuko Sugimoto, Shoichiro Matsuo
  • METHOD OF MEASURING CUT-OFF WAVELENGTH OF OPTICAL FIBER
    Publication number: 20120262706
    Abstract: A cut-off wavelength measuring method according to the present invention includes: preparing a single mode fiber as a reference fiber; preparing a measurement target fiber; adjusting the length of the single mode fiber such that the length of the single mode fiber is longer than the that of the measurement target fiber at the time of measuring power of transmission light and the reference fiber propagates only light of a base mode at a predicted cut-off wavelength of the measurement target fiber; measuring wavelength dependence of power of light transmitted through the reference fiber and wavelength dependence of power of light transmitted through the measurement target fiber; and calculating a cut-off wavelength of the measurement target fiber based on wavelength dependence represented as the ratio of the power of transmission light transmitted through the measurement target fiber to the power of light transmitted through the reference fiber.
    Type: Application
    Filed: April 5, 2012
    Publication date: October 18, 2012
    Applicant: Fujikura Ltd.
    Inventors: Yasuko SUGIMOTO, Shoichiro MATSUO