Patents by Inventor Eiichirou Takizawa

Eiichirou Takizawa 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 transmission equipment for suppressing a four wave mixing and optical transmission system
    Patent number: 6999230
    Abstract: There is suppressed deterioration of transmission quality resulting from FWM light generated in the optical fiber of an optical transmission apparatus that performs wavelength division multiplex transmission. To suppress deterioration of the transmission quality due to the FWM light, the sender apparatus adjusts the intensity of wavelength-division-multiplexed light output to the optical fiber, according to a level of FWM crosstalk observed by receiver apparatus.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: February 14, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Tetsuya Uda, Ryoichi Miyake, Takeshi Nakada, Yoshimasa Kusano, Eiichirou Takizawa
  • Optical transmission equipment for suppressing a four wave mixing and optical transmission system
    Publication number: 20030152388
    Abstract: There is suppressed deterioration of transmission quality resulting from FWM generated in the optical fiber of an optical transmission apparatus which performs wavelength division multiplex transmission. A wavelength division multiplexing optical transmission system is not restricted by a wavelength division multiplex density. Intensity of FWM generated in an optical fiber transmission line for each span is observed by a receiver side to determine intensity of output light to send the span by a sender side, to thereby suppress deterioration of the transmission quality due to the FWM generated in the optical fiber of a WDM optical transmission apparatus.
    Type: Application
    Filed: January 15, 2003
    Publication date: August 14, 2003
    Inventors: Tetsuya Uda, Ryoichi Miyake, Takeshi Nakada, Yoshimasa Kusano, Eiichirou Takizawa