Patents by Inventor Yoshinori Okuma

Yoshinori Okuma 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).

  • Driving circuit for electro-absorption optical modulator
    Patent number: 5930022
    Abstract: Disclosed is a driving circuit for an electro-absorption optical modulator for outputting intensity-modulated signal light by receiving carrier light from a light source and absorbing the carrier light in dependence upon a driving voltage. The driving circuit includes a driving unit for applying a pulsed driving voltage to an electro-absorption optical modulator, and a variable impedance unit connected in parallel with the electro-absorption optical modulator for matching impedance with respect to the driving unit. The impedance of the variable impedance unit is switched to one value when the driving voltage is applied to the electro-absorption optical modulator and to another value when the driving voltage is not applied to the electro-absorption optical modulator so as to match impedance with respect to the driving unit.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: July 27, 1999
    Assignee: Fujitsu Limited
    Inventor: Yoshinori Okuma