Patent ID: 6307996
Filing Date: 2001-10-23
Classification: G02B,G02F

Abstract:
An optical waveguide device comprising:a first epitaxial or uni-orientation ferroelectric thin film disposed on a surface of a single crystal substrate and formed into a lens shape to constitute a lens portion anda second epitaxial or uni-orientation ferroelectric thin film disposed on said single crystal substrate to constitute an optical waveguide portion and comprising a material or a composition different from that of said first ferroelectric thin film,wherein an optical beam incident to said optical waveguide portion is controlled by utilizing the difference of effective refractive index between said lens portion and said optical waveguide portion and,wherein a thickness of said first ferroelectric thin film is smaller than a thickness of said second ferroelectric thin film and larger than a cut-off film thickness for an optical waveguide to said first ferroelectric thin film.