Patent ID: 7184631
Filing Date: 2007-02-27
Classification: G02B,G02F

Abstract:
1. An optical device comprising: an optical input waveguide; a branch/cross waveguide including two waveguide portions, the entireties of which are non-parallel to one another; an optical output waveguide; and connection waveguides for respectively connecting said optical input waveguide and said branch/cross waveguide to one another, and connecting said optical output waveguide and said branch/cross waveguide to one another, wherein the spot size of light propagating through said branch/cross waveguide is larger than the spot size of light propagating through said optical input waveguide, said optical output waveguide, or said connection waveguides, and wherein at least one of the width and the thickness of said branch/cross waveguide is set at a value smaller than the width or the thickness of said optical input waveguide and said optical output waveguide; and wherein a branch/cross angle of said branch/cross waveguide is at least 3 degrees.