Patents by Inventor Masayuki Kiya

Masayuki Kiya 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 coupler and optical fiber for optical fiber coupler
    Patent number: 6563989
    Abstract: In a single mode optical fiber employed in an optical fiber coupler, letting r be the radial distance from the optical axis center, &Dgr;n(r) be the relative refractive index difference at the position r within a core portion with reference to the refractive index of a cladding portion placed about the core portion, &Dgr;npeak be the peak value of the relative refractive index difference &Dgr;n(r) at the position rpeak, and a be the core radius, the relative refractive index difference &Dgr;n (r) satisfies the relationship of &Dgr;n(r)≦&Dgr;npeak[1−(r/a)3] in the range of rpeak≦r≦a; and the refractive index of the cladding portion gradually decreases outward in its radial direction.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: May 13, 2003
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Shinji Ishikawa, Akira Urano, Masayuki Kiya
  • Optical fiber coupler and optical fiber for optical fiber coupler
    Publication number: 20020041737
    Abstract: In a single mode optical fiber employed in an optical fiber coupler, letting r be the radial distance from the optical axis center, &Dgr;n (r) be the relative refractive index difference at the position r within a core portion with reference to the refractive index of a cladding portion placed about the core portion, &Dgr;npeak be the peak value of the relative refractive index difference &Dgr;n (r) at the position rpeak, and a be the core radius, the relative refractive index difference &Dgr;n (r) satisfies the relationship of &Dgr;n (r)≦&Dgr;npeak [1−(r/a)3] in the range of rpeak≦r≦a; and the refractive index of the cladding portion gradually decreases outward in its radial direction.
    Type: Application
    Filed: September 28, 2001
    Publication date: April 11, 2002
    Inventors: Shinji Ishikawa, Akira Urano, Masayuki Kiya