Patents by Inventor Toshiyuki Hisano

Toshiyuki Hisano 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).

  • Propagation apparatus and dispersion value setting method
    Patent number: 8412045
    Abstract: A propagation apparatus includes a plurality of dispersion compensation execution units which accept a signal of a single wavelength from a wavelength-multiplexed signal which is received and execute dispersion compensation on the signal by inputting the accepted signal to a tunable dispersion compensator with an adjusted dispersion value, and a dispersion value calculation unit which acquires each dispersion value adjusted by the plurality of the dispersion compensation execution units, approximates the dispersion value of the wavelength assigned to a newly built line by using the acquired dispersion values whose signal error rates are in a tolerable range, and sets the approximated dispersion value as an initial value in the tunable dispersion compensator of the newly built line.
    Type: Grant
    Filed: December 6, 2009
    Date of Patent: April 2, 2013
    Assignee: Fujitsu Limited
    Inventors: Yuki Murakami, Katsumi Sugawa, Toshiyuki Hisano, Akihiro Horiuchi
  • PROPAGATION APPARATUS AND DISPERSION VALUE SETTING METHOD
    Publication number: 20100158537
    Abstract: A propagation apparatus includes a plurality of dispersion compensation execution units which accept a signal of a single wavelength from a wavelength-multiplexed signal which is received and execute dispersion compensation on the signal by inputting the accepted signal to a tunable dispersion compensator with an adjusted dispersion value, and a dispersion value calculation unit which acquires each dispersion value adjusted by the plurality of the dispersion compensation execution units, approximates the dispersion value of the wavelength assigned to a newly built line by using the acquired dispersion values whose signal error rates are in a tolerable range, and sets the approximated dispersion value as an initial value in the tunable dispersion compensator of the newly built line.
    Type: Application
    Filed: December 6, 2009
    Publication date: June 24, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Yuki MURAKAMI, Katsumi Sugawa, Toshiyuki Hisano, Akihiro Horiuchi