Patents by Inventor Yoshiki Nishida

Yoshiki Nishida 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 for optical amplifier
    Patent number: 5486947
    Abstract: Fluoride glass-based optical fiber for an optical amplifier which contains rare earth metal ions in the core glass has a relative refractive index difference .DELTA.n between the core and the cladding of 1.4% or more. The core glass contains PbF.sub.2 in a proportion of 25 mol % or less based on the total composition of the core glass. The fluoride glass is doped with rare earth metal ions, and part of the fluorine in the glass may be substituted by at least one halogen Pr.sup.3+, Pr.sup.3+ --Yb.sup.3+, Pr.sup.3+ --Nd.sup.3+, or Pr.sup.3+ --Er.sup.3+ can be doped as the rare earth metal ions. Chlorine, bromine or iodine may be used as the halogen.
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: January 23, 1996
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Yasutake Ohishi, Terutoshi Kanamori, Yoshiki Nishida, Atsushi Mori, Shoichi Sudo
  • Optical fiber for optical amplifier
    Patent number: 5351335
    Abstract: Fluoride glass-based optical fiber for an optical amplifier which contains rare earth metal ions in the core glass has a relative refractive index difference .DELTA..sub.n between the core and the cladding of 1.4% or more. The core glass contains PbF.sub.2 in a proportion of 25 mol % or less based on the total composition of the core glass . The fluoride glass is doped with rare earth metal ions, and part of the fluorine in the glass may be substituted by at least one halogen. Pr.sup.3+, Pr.sup.3+ --Yb.sup.3+, Pr.sup.3+ --Nd.sup.3+, or Pr.sup.3+ --Er.sup.3+ can be doped as the rare earth metal ions. Chlorine, bromine or iodine may be used as the halogen.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: September 27, 1994
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Yasutake Ohishi, Terutoshi Kanamori, Yoshiki Nishida, Atsushi Mori, Shoichi Sudo