OPTICAL CONTROL DEVICE AND METHOD FOR MAKING THE SAME

摘要

An optical control device has a LiNbO3 or LiTaO3 crystalline substrate having an electro-optic effect, a channel-type optical waveguide which is formed in the crystalline substrate by doping metal into first regions of a surface layer of the substrate, a first film layer which is optically-transparent and formed on the crystalline substrate, a second film layer, and electrodes formed on the optically-transparent first film layer. The portion of the surface layer of the crystalline substrate into which metal is not doped is defined as a remainder region. The second film layer is formed between the crystalline substrate and the the first film layer so as to be positioned adjacent at least a portion of the remainder region. The second film layer is made of a material that is different from that of the crystalline substrate and the first film layer.