Patents by Inventor Norimitsu Takaishi

Norimitsu Takaishi 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).

  • Optical fiber tape of low polarization mode dispersion characteristic and method for measuring dynamic viscoelasticity of the optical fiber tape
    Patent number: 7209614
    Abstract: An optical fiber tape having low polarization mode dispersion characteristics and applied to a dense wavelength multiplex (DWDM) transmission system of a transmission rate from several Gb/s to several tens of Gb/S. We have found out that the polarization mode dispersion of an optical fiber tape relates to the loss tangent (tan ?) determined when the dynamic viscoelasticity is measured, and that particularly, if the loss tangent of when a dispersion shift fiber is used is made 0.080 or more and the loss tangent of when a single mode optical fiber is used is made 0.042 or more, the polarization mode coefficient of dispersion (PMD) is reduced to 0.3 ps/?km preferable to realize a DWDM transmission system.
    Type: Grant
    Filed: March 10, 2005
    Date of Patent: April 24, 2007
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Hiroki Tanaka, Yasuo Nakajima, Mitsunori Okada, Norimitsu Takaishi, Kenichi Mizoguchi, Hidetoshi Yasui
  • Optical fiber tape of low polarization mode dispersion characteristic and method for measuring dynamic viscoelasticity of the optical fiber tape
    Publication number: 20050244117
    Abstract: An optical fiber tape having low polarization mode dispersion characteristics and applied to a dense wavelength multiplex (DWDM) transmission system of a transmission rate from several Gb/s to several tens of Gb/S. We have found out that the polarization mode dispersion of an optical fiber tape relates to the loss tangent (tan?) determined when the dynamic viscoelasticity is measured, and that particularly, if the loss tangent of when a dispersion shift fiber is used is made 0.080 or more and the loss tangent of when a single mode optical fiber is used is made 0.042 or more, the polarization mode coefficient of dispersion (PMD) is reduced to 0.3 ps/{square root}km preferable to realize a DWDM transmission system.
    Type: Application
    Filed: March 10, 2005
    Publication date: November 3, 2005
    Applicant: THE FURUKAWA ELECTRIC CO., LTD.
    Inventors: Hiroki Tanaka, Yasuo Nakajima, Mitsunori Okada, Norimitsu Takaishi, Kenichi Mizoguchi, Hidetoshi Yasui