Patents by Inventor Yasuhiro Hamajima

Yasuhiro Hamajima 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).

  • Laser device, controller and method for controlling the laser device
    Patent number: 7012938
    Abstract: A laser device includes a laser diode, and a controller that superimposes a low-frequency signal on a modulating signal applied to the laser diode. The low-frequency signal has an amplitude that correlates with an amplitude of the modulating signal.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: March 14, 2006
    Assignee: Fujitsu Quantum Devices Ltd.
    Inventors: Yasuhiro Hamajima, Hiroyuki Imoto, Hiroaki Maki
  • Laser device, controller and method for controlling the laser device
    Publication number: 20040052281
    Abstract: A laser device includes a laser diode, and a controller that superimposes a low-frequency signal on a modulating signal applied to the laser diode. The low-frequency signal has an amplitude that correlates with an amplitude of the modulating signal.
    Type: Application
    Filed: June 19, 2003
    Publication date: March 18, 2004
    Applicant: FUJITSU QUANTUM DEVICES LIMITED
    Inventors: Yasuhiro Hamajima, Hiroyuki Imoto, Hiroaki Maki