Waveguide-type optical switch.

摘要

The disclosed waveguide-type optical switch (10) comprising a substrate (20), branched first and second waveguide routes (12, 14) provided thereon, and an electrode(s) (16) provided on the substrate for controlling the propagation-constant difference or refractive index difference between the first and second waveguide routes. The distance between the first and second waveguide routes increases from the branch point (P) side towards the terminal end (12b, 14b) side side of the waveguide routes. The first and second waveguide routes are provided with a branched part (I). The first and second waveguide routes are provided with the bending portions (II) connected to the branch part, respectively. The local branch angle between the first and second waveguide routes on the side of starting ends (Z = 0;) of the bending portions (II) is enlarged while the local branch angle between the first and second waveguide routes on the side of terminal ends (Z = L) of the bending portions (II) is reduced.