| 摘要 |
In an optical waveguide Y junction, comprising an input waveguide path, a split portion having one end smoothly connected to an end of said input waveguide path, and a pair of bifurcated ends, and a pair of output waveguide paths each paving an end smoothly connected to a corresponding one of said bifurcated ends of said split portion, the split portion defines a modified asymmetric Y-shaped waveguide path whic h is defined by modifying an original symmetric Y-shaped waveguide path having a substantially constant width by removing an asymmetric wedge-shaped section from a side of the split portion interposed between the output waveguide paths. Thu s, simply by changing the inner profile of the split portion, a desired uneven split ratio can be achieved without providing a spread out split portion or requiring any abrup t change in the shape of the waveguide path. This contributes to the reduction in the lo ss of the signal light. Also, a desired split ratio can be readily achieved by suitabl y changing the dimensions of the wedge-shaped section. In particular, by selecting a wedge- shaped inner profile, the design and fabrication of the junction can be simplified.
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