| 摘要 |
PURPOSE:To achieve integration while increasing a branch angle by providing an electrode to each grating formed at the intersection part of an optical waveguide formed in an electrooptic crystal substrate, and by controlling Bragg reflection conditions by applying a voltage. CONSTITUTION:At the intersection parts of optical waveguides 2 formed in an electrooptic crystal substrate 1 of LiNbO3, etc., grating reflectors 6 are provided by ion etching, etc., and an electric field is applied to electrodes 7 and 7' arrnaged at both the sides of each reflector 6 to vary the refractiveity of the grating part. Then, Bragg reflection conditions are changed to perform optical switching. Consequently, integration is achieved with a branch angle increased. |
