| 摘要 |
A thin-film optical function element, including a substrate formed of a dielectric material, a first optical waveguide consisting of a thin film of a dielectric material formed on the substrate, and a second optical waveguide consisting of another thin film of another dielectric material formed on the substrate. The first optical waveguide has a substantially same propagation constant with respect to two different modes which have field patterns whose vibrating directions are perpendicular to each other. The second optical waveguide is optically coupled to the first optical waveguide, and is adapted to pass therethrough only one of the two different modes.
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