Waveguide-type optical device.

摘要

In a waveguide-type optical device, two optical waveguides are formed in a substrate of LiNbO3 or LiTaO3. On the substrate and the two waveguides, a blocking layer is formed to block a diffusion of Li ions from the substrate. On the blocking layer, a buffer layer made from SiO2 is formed. Each of electrodes from which operation voltages are supplied covers each coupling part of the two optical waveguides, respectively via the blocking layer and the buffer layer.