Patents by Inventor Tougo Fukushi

Tougo Fukushi 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 transmission system
    Patent number: 7551857
    Abstract: An optical amplifier may be quickly returned from a shutdown state to a regular state after getting recovery information of a fault. Gain setting by ASE is conducted to the repeaters on the up-stream side during the shutdown state, by outputting ASE light with the same intensity as the WDM signal. Accordingly, before realizing the recovery of shutdown, the gain setting is completed with the light whose intensity is within the safe criterion. After realizing the recovery of shutdown, the optical transmission system can be returned quickly to the regular operating state after recovery of shutdown state.
    Type: Grant
    Filed: July 11, 2005
    Date of Patent: June 23, 2009
    Assignee: Fujitsu Limited
    Inventors: Tougo Fukushi, Hideaki Sugiya, Akira Yamamoto, Masanori Kondoh
  • Optical transmission system
    Publication number: 20060013583
    Abstract: An optical amplifier may be quickly returned from a shutdown state to a regular state after getting recovery information of a fault. Gain setting by ASE is conducted to the repeaters on the up-stream side during the shutdown state, by outputting ASE light with the same intensity as the WDM signal. Accordingly, before realizing the recovery of shutdown, the gain setting is completed with the light whose intensity is within the safe criterion. After realizing the recovery of shutdown, the optical transmission system can be returned quickly to the regular operating state after recovery of shutdown state.
    Type: Application
    Filed: July 11, 2005
    Publication date: January 19, 2006
    Inventors: Tougo Fukushi, Hideaki Sugiya, Akira Yamamoto, Masanori Kondoh