Patents by Inventor Yoko Moriai

Yoko Moriai 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 amplification fiber, optical fiber amplifier, and optical communication system
    Patent number: 7206486
    Abstract: An optical amplification fiber for an optical fiber amplifier that amplifies a signal light using a pumping light has an absorption coefficient that satisfies conditional relations ?s?2.0 dB/m and ?p/?s??0.0697×?s+1.30, where ?p is the absorption coefficient in a pumping light wavelength band, and ?s is the absorption coefficient in a signal light wavelength band.
    Type: Grant
    Filed: April 13, 2005
    Date of Patent: April 17, 2007
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Yoko Moriai, Keiichi Aiso
  • Method for manufacturing a glass doped with a rare earth element and fiber for optical amplification using the same
    Patent number: 7079738
    Abstract: An optical fiber for optical amplification, characterized in that a full width at half maximum of gain spectrum is 45 nm or more; and a maximum value of power conversion efficiency is 80% or more. A method for producing a rare earth element-doped glass for use in manufacturing the optical fiber, which comprises a deposition step of depositing fine silica glass particles and a co-dopant (a) to prepare an aggregate of fine silica glass particles doped with the co-dopant (a); and a immersion step of immersing the aggregate of fine silica glass particles prepared in the deposition step in a solution containing the rare earth element and the co-dopant (b) to thereby dope the aggregate of fine silica glass particles with the rare earth element component and the co-dopant (b).
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: July 18, 2006
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Toshihiro Nakamura, Keiichi Aiso, Takeshi Yagi, Hisashi Koaizawa, Yoko Moriai
  • Optical amplification fiber, optical fiber amplifier, and optical communication system
    Publication number: 20050232562
    Abstract: An optical amplification fiber for an optical fiber amplifier that amplifies a signal light using a pumping light has an absorption coefficient that satisfies conditional relations ?s?2.0 dB/m and ?p/?s??0.0697×?s+1.30, where ?p is the absorption coefficient in a pumping light wavelength band, and ?s is the absorption coefficient in a signal light wavelength band.
    Type: Application
    Filed: April 13, 2005
    Publication date: October 20, 2005
    Applicant: The Furukawa Electric Co., Ltd.
    Inventors: Yoko Moriai, Keiichi Also
  • Method for manufacturing a glass doped with a rare earth element and fiber for optical amplification using the same
    Publication number: 20040190846
    Abstract: An optical fiber for optical amplification, characterized in that a full width at half maximum of gain spectrum is 45 nm or more; and a maximum value of power conversion efficiency is 80% or more. A method for producing a rare earth element-doped glass for use in manufacturing the optical fiber, which comprises a deposition step of depositing fine silica glass particles and a co-dopant (a) to prepare an aggregate of fine silica glass particles doped with the co-dopant (a); and a immersion step of immersing the aggregate of fine silica glass particles prepared in the deposition step in a solution containing the rare earth element and the co-dopant (b) to thereby dope the aggregate of fine silica glass particles with the rare earth element component and the co-dopant (b).
    Type: Application
    Filed: April 15, 2004
    Publication date: September 30, 2004
    Applicant: The Furukawa Electric Co., Ltd.
    Inventors: Toshihiro Nakamura, Keiichi Aiso, Takeshi Yagi, Hisashi Koaizawa, Yoko Moriai