Patents by Inventor Yuuichi Kawahata

Yuuichi Kawahata 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).

  • Dispersion compensating device and optical transmission system
    Patent number: 7366422
    Abstract: A dispersion compensating device having a VIPA plate which is an optical component, a lens, and a mirror includes high reflectivity side monitor means for monitoring the light that is input into the VIPA plate and emitted from the first reflecting surface. By this, the passage characteristics of the dispersion compensating device (VIPA) can be equalized to the input light wavelength (output wavelength of light transmitter) in a highly stable manner while restraining the loss of main signal light to the minimum.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: April 29, 2008
    Assignee: Fujitsu Limited
    Inventors: Motoyoshi Sekiya, Yuuichi Kawahata
  • Dispersion compensating device and optical transmission system
    Publication number: 20060098988
    Abstract: A dispersion compensating device having a VIPA plate which is an optical component, a lens, and a mirror includes high reflectivity side monitor means for monitoring the light that is input into the VIPA plate and emitted from the first reflecting surface. By this, the passage characteristics of the dispersion compensating device (VIPA) can be equalized to the input light wavelength (output wavelength of light transmitter) in a highly stable manner while restraining the loss of main signal light to the minimum.
    Type: Application
    Filed: March 22, 2005
    Publication date: May 11, 2006
    Applicant: Fujitsu Limited
    Inventors: Motoyoshi Sekiya, Yuuichi Kawahata