| 摘要 |
The invention relates to an optical branching circuit connected to a light output end face of an optical waveguide circuit or an optical branching circuit and for branching input light, and has a feature to provide an optical branching circuit with less branching ratio variation. The optical branching circuit is comprised of an input optical waveguide formed on a silica glass substrate and for outputting input light inputted from a light input end face to a light output end face, a tapered optical waveguide disposed to be shifted with respect to the input optical waveguide at the light output end face, and branching optical waveguides connected to a light output end face of the tapered optical waveguide at a predetermined branching angle.
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