Patents by Inventor Fumihiro Kounushi

Fumihiro Kounushi 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).

  • Distributed feedback semiconductor laser
    Patent number: 5727015
    Abstract: A gain coupled distributed feedback semiconductor laser includes an active layer and a diffraction grating provided in the vicinity of the active layer and having a plurality of light absorption layers periodically arranged along a resonator length direction. The order of the diffraction grating is one, a duty of the diffraction grating is in the range of about 0.4 to about 0.8, and a thickness of the light absorption layer is in the range of about 6 nm to about 30 nm.
    Type: Grant
    Filed: March 6, 1996
    Date of Patent: March 10, 1998
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koji Takahashi, Fumihiro Kounushi, Mototaka Taneya