Patents by Inventor Shinji Habu

Shinji Habu 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).

  • Method for compensating modal dispersion in multimode optical fiber transmission path
    Patent number: 7139457
    Abstract: In an optical transmission path including multimode optical fibers, modal dispersion is reduced so that signal light can be transmitted at high speed and across a broad band, at low-cost and over a long distance. To reduce modal dispersion, when the transmission path is constructed by coupling a plurality of multimode optical fibers, a length ratio for the multimode optical fibers that obtains the maximum band of the optical transmission path is determined, and the multimode optical fibers are coupled according to this length ratio. The multimode optical fibers that are used have specific refractive index profiles as mode dispersion-compensating fibers. The compensated fiber and the mode dispersion-compensating fiber are coupled with specific lengths.
    Type: Grant
    Filed: August 2, 2005
    Date of Patent: November 21, 2006
    Assignee: Fujikura Ltd.
    Inventors: Ning Guan, Shinji Habu, Katsuhiro Takenaga, Kuniharu Himeno, Koichi Harada
  • Method for compensating modal dispersion in multimode optical fiber transmission path
    Publication number: 20060034573
    Abstract: In an optical transmission path including multimode optical fibers, modal dispersion is reduced so that signal light can be transmitted at high speed and across a broad band, at low-cost and over a long distance. To reduce modal dispersion, when the transmission path is constructed by coupling a plurality of multimode optical fibers, a length ratio for the multimode optical fibers that obtains the maximum band of the optical transmission path is determined, and the multimode optical fibers are coupled according to this length ratio. The multimode optical fibers that are used have specific refractive index profiles as mode dispersion-compensating fibers. The compensated fiber and the mode dispersion-compensating fiber are coupled with specific lengths.
    Type: Application
    Filed: August 2, 2005
    Publication date: February 16, 2006
    Inventors: Ning Guan, Shinji Habu, Katsuhiro Takenaga, Kuniharu Himeno, Koichi Harada