Patents by Inventor Koji Hasuo

Koji Hasuo 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 communication system
    Patent number: 7376348
    Abstract: An optical transmission equipment in an optical communication system interconnecting two optical transmission equipment sets by a main transmission line and a backup transmission line. An optical amplifier amplifies and outputs optical signals from one transmission line in use, interconnecting the optical transmission equipment concerned with neighboring upstream optical transmission equipment, and outputs the optical signals including a signal component and a noise component. A controller controls an optical signal level so that a signal component in the optical signal reaches a predetermined level.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: May 20, 2008
    Assignee: Fujitsu Limited
    Inventors: Koji Hasuo, Futoshi Izumi
  • Optical communication system
    Publication number: 20070264013
    Abstract: An optical transmission equipment in an optical communication system interconnecting two optical transmission equipment sets by a main transmission line and a backup transmission line. An optical amplifier amplifies and outputs optical signals from one transmission line in use, interconnecting the optical transmission equipment concerned with neighboring upstream optical transmission equipment, and outputs the optical signals including a signal component and a noise component. A controller controls an optical signal level so that a signal component in the optical signal reaches a predetermined level.
    Type: Application
    Filed: June 1, 2007
    Publication date: November 15, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Koji Hasuo, Futoshi Izumi
  • Optical communication system
    Patent number: 7242865
    Abstract: An optical transmission equipment in an optical communication system interconnecting two optical transmission equipment sets by a main transmission line and a backup transmission line. An optical amplifier amplifies and outputs optical signals from one transmission line in use, interconnecting the optical transmission equipment concerned with neighboring upstream optical transmission equipment, and outputs the optical signals including a signal component and a noise component. A controller controls an optical signal level so that a signal component in the optical signal reaches a predetermined level.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: July 10, 2007
    Assignee: Fujitsu Limited
    Inventors: Koji Hasuo, Futoshi Izumi
  • Optical communication system
    Publication number: 20040247312
    Abstract: An optical transmission equipment in an optical communication system interconnecting two optical transmission equipment sets by a main transmission line and a backup transmission line. An optical amplifier amplifies and outputs optical signals from one transmission line in use, interconnecting the optical transmission equipment concerned with neighboring upstream optical transmission equipment, and outputs the optical signals including a signal component and a noise component. A controller controls an optical signal level so that a signal component in the optical signal reaches a predetermined level.
    Type: Application
    Filed: June 3, 2004
    Publication date: December 9, 2004
    Applicant: FUJITSU LIMITED
    Inventors: Koji Hasuo, Futoshi Izumi