Patents by Inventor Masaki Oomura

Masaki Oomura 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 with built-in grating and optical fiber for forming grating therein
    Patent number: 6842566
    Abstract: The present invention provides an optical fiber equipped with a grating that functions as a narrow-band loss filter. The optical fiber has a core, an inner cladding, an intermediate cladding, and an outer cladding, which have refractive indexes n0, n1, n2, and n3, respectively, the refractive indexes having a relationship of n0>n3?n1n2. At least a part of the inner cladding has a grating. The refractive index of the intermediate cladding is lower than the refractive indexes of the inner cladding and the outer cladding such that a recession is formed in the refractive index profile of the clad. The grating is provided on the inner side relative to the recession.
    Type: Grant
    Filed: July 12, 2002
    Date of Patent: January 11, 2005
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Shinji Ishikawa, Toshiki Taru, Masakazu Shigehara, Masaki Oomura
  • Optical fiber with built-in grating and optical fiber for forming grating therein
    Publication number: 20030021533
    Abstract: The present invention provides an optical fiber equipped with a grating that functions as a narrow-band loss filter. The optical fiber has a core, an inner cladding, an intermediate cladding, and an outer cladding, which have refractive indexes n0, n1, n2, and n3, respectively, the refractive indexes having a relationship of n0>n3≧n1n2. At least a part of the inner cladding has a grating. The refractive index of the intermediate cladding is lower than the refractive indexes of the inner cladding and the outer cladding such that a recession is formed in the refractive index profile of the clad. The grating is provided on the inner side relative to the recession.
    Type: Application
    Filed: July 12, 2002
    Publication date: January 30, 2003
    Inventors: Shinji Ishikawa, Toshiki Taru, Masakazu Shigehara, Masaki Oomura