Patents by Inventor Isamu Oshima

Isamu Oshima 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).

  • Er-doped optical fiber amplifier
    Patent number: 5883736
    Abstract: An Er-doped optical fiber amplifier is adapted to increase the length of transmission path by raising the intensity of pumped light. In an Er-doped optical fiber amplifier 1 for amplifying signal light by means of an Er-doped optical fiber 7, using a 1,530 nm band pumping source 8, 1,530 nm band pumped light is Raman-amplified by a 1,430 nm-1,450 nm band light source 9 on the transmission path of an optical fiber 5.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: March 16, 1999
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Isamu Oshima, Akira Fujisaki, Haruki Ogoshi