Patents by Inventor Reiko Kojima

Reiko Kojima 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).

  • Slant short-period grating
    Patent number: 6836418
    Abstract: There is provided a slant short-period grating which is obtainable by irradiating light onto an optical fiber whose core is formed from quartz glass to which has been doped a photosensitive dopant that changes a refractive index of the quartz glass by light irradiation, and whose clad has one or two or more layers with at least the layer that is adjacent to the core being a photosensitive layer formed from quartz glass to which has been doped a photosensitive dopant that changes a refractive index of the quartz glass by light irradiation. In this slant short-period grating a grating portion is formed by changing the refractive index of the photosensitive layer of the clad and the core at a predetermined grating period along a longitudinal direction of the optical fiber by a predetermined slant angle.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: December 28, 2004
    Assignee: Fujikura Ltd.
    Inventors: Akira Sakamoto, Masaaki Sudo, Reiko Kojima, Tomosada Inada, Satoshi Okude, Kenji Nishide
  • Slant short-period grating
    Publication number: 20030142912
    Abstract: There is provided a slant short-period grating which is obtainable by irradiating light onto an optical fiber whose core is formed from quartz glass to which has been doped a photosensitive dopant that changes a refractive index of the quartz glass by light irradiation, and whose clad has one or two or more layers with at least the layer that is adjacent to the core being a photosensitive layer formed from quartz glass to which has been doped a photosensitive dopant that changes a refractive index of the quartz glass by light irradiation. In this slant short-period grating a grating portion is formed by changing the refractive index of the photosensitive layer of the clad and the core at a predetermined grating period along a longitudinal direction of the optical fiber by a predetermined slant angle.
    Type: Application
    Filed: December 17, 2002
    Publication date: July 31, 2003
    Inventors: Akira Sakamoto, Masaaki Sudo, Reiko Kojima, Tomosada Inada, Satoshi Okude, Kenji Nishide