| 摘要 |
A power-saving, miniaturized, high-performance light directional coupler. At least two closely-arranged parallel light waveguides of an LiNbO3 monocrystal film are formed in an LiTaO3 mono-crystalline substrate or on the substrate. Means for varying the refractive index of the waveguide is provided at least on one of the light waveguides. In addition, the crystal lattice of the LiTaO3 monocrystal substrate and that of the LiNbO3 monocrystal film constituting the light waveguides are matched with each other. <IMAGE> |
