| 摘要 |
A waveguide type optical switch comprises a substrate having an electro-optical effect, a directional coupling type switch portion including two optical waveguides formed on the substrate for effecting optical switching by optical coupling. The waveguide switch includes a branched interfering portion provided on at least one of the two optical waveguides of the directional coupling switch portion, for controlling an intensity of light output from the directional coupling switch portion to obviate polarization dependency.
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