| 摘要 |
An optical directional coupler ( 1 ) comprises first and second straight optical waveguides ( 2, 3 ) having respective cores ( 2 a, 3 a) extending longitudinally close to each other to form an optical coupler portion, and a tapered optical waveguide ( 4 ) having a core ( 4 a) connected to the core ( 2 a) of the first straight waveguide ( 2 ). The core ( 2 a) of the first straight waveguide ( 2 ) has a centerline ( 2 d). A width of the core ( 4 a) of the tapered waveguide ( 4 ) becomes narrow toward the first straight waveguide ( 2 ) and a profile of the tapered waveguide ( 4 ) is asymmetric relative to the centerline ( 2 d) of the core ( 2 a) of the first straight waveguides ( 2 ).
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