Patents by Inventor Katsunori Inoue

Katsunori Inoue 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).

  • Low-dispersion optical fiber and optical transmission system using the low-dispersion optical fiber
    Patent number: 6766089
    Abstract: A low-dispersion optical fiber provides both reduced chromatic dispersion in a used wavelength band and increased effective core area. The low-dispersion optical fiber is made by covering a center core (1) with a first side core (2), covering the first side core (2) with a second side core (3), and covering the second side core (3) with a cladding (5). When the maximum refractive index of the center core (1) is written n1, the minimum refractive index of the first side core (2) is written n2, the maximum refractive index of the second side core (3) is written n3 and the refractive index of the cladding (5) is written nc, then n1>n3>nc>n2 is satisfied. Relative refractive index differences &Dgr;1, &Dgr;2 and &Dgr;3 with respect to the cladding (5) of the maximum refractive index of the center core (1), the minimum refractive index of the first side core (2) and the maximum refractive index of the second side core (3) respectively are made 0.4%≦&Dgr;1≦0.7%, −0.30%≦&Dgr;2≦−0.
    Type: Grant
    Filed: September 16, 2003
    Date of Patent: July 20, 2004
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Shinichi Arai, Ryuichi Sugizaki, Keiichi Aiso, Naoto Oyama, Jun Terada, Hisashi Koaizawa, Katsunori Inoue
  • Low-dispersion optical fiber and optical transmission system using the low-dispersion optical fiber
    Publication number: 20040062500
    Abstract: A low-dispersion optical fiber provides both reduced chromatic dispersion in a used wavelength band and increased effective core area. The low-dispersion optical fiber is made by covering a center core (1) with a first side core (2), covering the first side core (2) with a second side core (3), and covering the second side core (3) with a cladding (5). When the maximum refractive index of the center core (1) is written n1, the minimum refractive index of the first side core (2) is written n2, the maximum refractive index of the second side core (3) is written n3 and the refractive index of the cladding (5) is written nc, then n1>n3>nc>n2 is satisfied. Relative refractive index differences &Dgr;1, &Dgr;2 and &Dgr;3 with respect to the cladding (5) of the maximum refractive index of the center core (1), the minimum refractive index of the first side core (2) and the maximum refractive index of the second side core (3) respectively are made 0.4%≦&Dgr;1≦0.7%, −0.30%≦&Dgr;2≦−0.
    Type: Application
    Filed: September 16, 2003
    Publication date: April 1, 2004
    Inventors: Shinichi Arai, Ryuichi Sugizaki, Keiichi Aiso, Naoto Oyama, Jun Terada, Hisashi Koaizawa, Katsunori Inoue
  • Low-dispersion optical fiber and optical transmission system using the low-dispersion optical fiber
    Patent number: 6684018
    Abstract: A low-dispersion optical fiber provides both reduced chromatic dispersion in a used wavelength band and increased effective core area. The low-dispersion optical fiber is made by covering a center core (1) with a first side core (2), covering the first side core (2) with a second side core (3), and covering the second side core (3) with a cladding (5). When the maximum refractive index of the center core (1) is written n1, the minimum refractive index of the first side core (2) is written n2, the maximum refractive index of the second side core (3) is written n3 and the refractive index of the cladding (5) is written nc, then n1>n3>nc>n2 is satisfied. Relative refractive index differences &Dgr;1, &Dgr;2 and &Dgr;3 with respect to the cladding (5) of the maximum refractive index of the center core (1), the minimum refractive index of the first side core (2) and the maximum refractive index of the second side core (3) respectively are made 0.4%≦&Dgr;1≧0.7%, −0.30%≦&Dgr;2≦−0.
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: January 27, 2004
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Shinichi Arai, Ryuichi Sugizaki, Keiichi Aiso, Naoto Oyama, Jun Terada, Hisashi Koaizawa, Katsunori Inoue
  • Low-dispersion optical fiber and optical transmission system using the low-dispersion optical fiber
    Publication number: 20020102085
    Abstract: A low-dispersion optical fiber provides both reduced chromatic dispersion in a used wavelength band and increased effective core area. The low-dispersion optical fiber is made by covering a center core (1) with a first side core (2), covering the first side core (2) with a second side core (3), and covering the second side core (3) with a cladding (5). When the maximum refractive index of the center core (1) is written n1, the minimum refractive index of the first side core (2) is written n2, the maximum refractive index of the second side core (3) is written n3 and the refractive index of the cladding (5) is written nc, then n1>n3>nc>n2 is satisfied. Relative refractive index differences &Dgr;1, &Dgr;2 and &Dgr;3 with respect to the cladding (5) of the maximum refractive index of the center core (1), the minimum refractive index of the first side core (2) and the maximum refractive index of the second side core (3) respectively are made 0.4%≦1&Dgr;≧0.7%, −0.30%≦&Dgr;2≲−0.
    Type: Application
    Filed: October 25, 2001
    Publication date: August 1, 2002
    Applicant: THE FURUKAWA ELECTRIC CO., LTD.
    Inventors: Shinichi Arai, Ryuichi Sugizaki, Keiichi Aiso, Naoto Oyama, Jun Terada, Hisashi Koaizawa, Katsunori Inoue