Patents Assigned to Osaka Electric and Communication University
  • Optical filter coupler
    Patent number: 5031989
    Abstract: An optical filter-coupler comprises at least two optical waveguides such as optical fibers closely spaced apart to each other for allowing light propagating in one waveguide to couple into the other. Materials for the waveguides are selected to have different wavelength-dispersive refractive indexes so that the waveguides have a common refractive index at a selected wavelength, whereby a complete power transfer is obtained at such selected wavelength.
    Type: Grant
    Filed: September 16, 1988
    Date of Patent: July 16, 1991
    Assignees: Osaka Electric and Communication University, Seiko Instruments Inc.
    Inventors: Katsumi Morishita, Toshiharu Takesue