Patent ID: 6236784
Filing Date: 2001-05-22
Classification: G02B

Abstract:
A Y branch optical waveguide, comprising:a first optical waveguide;two second optical waveguides; anda multi-mode optical waveguide connected between said first optical waveguide and said two second optical waveguides; whereinthe width of said first optical waveguide and the width of said multi-mode optical waveguide are different in a direction orthogonal to an extension of an optical axis at a portion where said first optical waveguide and said multi-mode optical waveguide are connected to each other, andsaid multi-mode optical waveguide has shapes asymmetric with respect to an extension of a center line, extending in the direction of the optical axis, of said first optical waveguide so that propagation light has an asymmetric optical intensity distribution at a portion where said multi-mode optical waveguide and second optical waveguides are connected when light is incident from said first optical waveguide, andsaid optical intensity distribution has a first peak and a second peak different in light intensity from each other and each of said peaks is located at near a center of each of said second optical waveguides at portions where said multi-mode optical waveguide and said second optical waveguides are connected, respectively.