Patents by Inventor Mikinori Yamanaka

Mikinori Yamanaka 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 amplifier
    Patent number: 6201635
    Abstract: The invention relates to an optical amplifier; more particularly, the invention provides an optical amplifier that contains a front-end optical amplifier and a back-end optical amplifier, and that is equipped with an automatic compensation function for automatically detecting and compensating for signal loss caused by a dispersion compensator inserted between the front-end and back-end optical amplifiers. The optical amplifier, which contains a front-end optical amplifier 31 and a back-end optical amplifier 32, comprises: a loss detection means 36 for detecting optical signal loss occurring between the front-end optical amplifier and the back-end optical amplifier; and a gain control means 37 for compensating, based on the loss detected by the loss detection means, for a variation in optical output power of the entire optical amplifier including the front-end optical amplifier and back-end optical amplifier.
    Type: Grant
    Filed: February 11, 1999
    Date of Patent: March 13, 2001
    Assignee: Fujitsu Limited
    Inventors: Mikinori Yamanaka, Yuji Tamura