| 摘要 |
Optical path length difference should be correctly controlled for a pair of optical waveguides even in the pair of the optical waveguides which include combination of a large number of curved waveguide portions. A pair of optical waveguides include curved sections, wherein the curved section has the shape including arcuate waveguide portions which have the same curvatures, and wherein the optical waveguides have the same number of the arcuate waveguide portions.
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