Patents by Inventor Osamu Kasu

Osamu Kasu 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 device and method of making the same
    Patent number: 6817784
    Abstract: The present invention relates to an optical fiber device having a structure for effectively restraining the splice loss from increasing between two kinds of optical fibers having respective mode field diameters different from each other. The optical fiber device comprises first and second optical fibers fusion-spliced to each other, which are partly heat-treated such that both of their respective ratios of change in mode field diameter in the longitudinal direction become a predetermined value or less after fusion-splicing. When the ratios of change in mode field diameter in the vicinity of the fused point are appropriately controlled as such, the increase in splice loss at the fused point between the first and second optical fibers is effectively suppressed.
    Type: Grant
    Filed: October 16, 2001
    Date of Patent: November 16, 2004
    Assignee: Sujitomo Electric Industries, Ltd.
    Inventors: Motonori Nakamura, Osamu Kasu, Daisuke Yokota
  • Optical fiber device and method of making the same
    Publication number: 20020048437
    Abstract: The present invention relates to an optical fiber device having a structure for effectively restraining the splice loss from increasing between two kinds of optical fibers having respective mode field diameters different from each other. The optical fiber device comprises first and second optical fibers fusion-spliced to each other, which are partly heat-treated such that both of their respective ratios of change in mode field diameter in the longitudinal direction become a predetermined value or less after fusion-splicing. When the ratios of change in mode field diameter in the vicinity of the fused point are appropriately controlled as such, the increase in splice loss at the fused point between the first and second optical fibers is effectively suppressed.
    Type: Application
    Filed: October 16, 2001
    Publication date: April 25, 2002
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Motonori Nakamura, Osamu Kasu, Daisuke Yokota