Optical waveguide and optical waveguide device

摘要

Optical device including an optical waveguide composed of a LiTaO3 monocrystalline substrate and a LiNbO3 monocrystalline thin film waveguide formed on the surface of the substrate, with the lattice length of the LiNbO3 monocrystalline thin film waveguide and the LiTaO3 monocrystalline substrate being matched with each other, and an electrode provided on at least one of the branched sections of the waveguide extending along the optical axis thereof for changing a refractive index of the waveguide. The optical device having the optical waveguide has excellent electro-optic effects and a resistance to optical damage as well as an advanced modulation efficiency and a stable amplitude modulation.