Patents by Inventor Masahiro Mitsuda

Masahiro Mitsuda 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 fiber amplifier and optical fiber communication system
    Patent number: 5598294
    Abstract: The optical fiber amplifier of the invention includes: a rare earth element doped optical fiber, and a pump light generator for optically pumping the rare earth element doped optical fiber. The optical fiber amplifier further includes a reflector for selectively reflecting an optical signal input from an input end of the rare earth element doped optical fiber to the input end, so as to give a gain to the optical signal.
    Type: Grant
    Filed: August 16, 1995
    Date of Patent: January 28, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tomoaki Uno, Jun Ohya, Masahiro Mitsuda
  • Optical fiber amplifier and optical fiber transmission system
    Patent number: 5563733
    Abstract: An optical fiber amplifier for optically amplifying a plurality of signals having different wavelengths includes a series of rare earth doped optical fibers and at least one pump light source generating pump light for exciting the series of rare earth doped optical fibers. A first signal among the plurality of signals propagates through a part of the series of rare earth doped optical fibers, and a second signal among the plurality of signals propagates through all of the series of rare earth doped optical fibers.
    Type: Grant
    Filed: August 25, 1995
    Date of Patent: October 8, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masahiro Mitsuda, Jun Ohya, Tomoaki Uno