| 摘要 |
In a waveguide 10 including a substrate 1 , a lower clad 2 , an upper clad 3 , and a core 4 , the outline of a cross section perpendicular to the light propagating direction of the core 4 surrounded by the lower clad 2 has a shape curved with respect to the center of the cross section. The separation in the waveguide is thereby prevented, and the reliability of the optical property is enhanced.
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