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US 5,347,608 AGranted
Optical waveguide and optical waveguide device
AssigneeIbiden Co., Ltd.
InventorsMasanori Nakamura, Yoshikazu Sakaguchi
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AssigneeIbiden Co., Ltd.
InventorsMasanori Nakamura, Yoshikazu Sakaguchi
Estimating the term…
Optical device including an optical waveguide composed of a LiTaO.sub.3 monocrystalline substrate and a LiNbO.sub.3 monocrystalline thin film waveguide formed on the surface of the substrate, with the lattice length of the LiNbO.sub.3 monocrystalline thin film waveguide and the LiTaO.sub.3 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.
A single mode optical waveguide comprising:
A waveguide device comprising an LiTaO.sub.3 monocrystalline substrate, an LiNbO.sub.3 monocrystalline thin film waveguide formed on a surface of said LiTaO.sub.3 monocrystalline substrate, said thin film waveguide having Mach-Zehnder type branched sections on a part of the thin film waveguide, and an electrode for changing a refractive index of the waveguide provided on at least one of the branched sections, and including at least an Na content in a range of 0.1 to 14.3 mol % and a Mg content in a range of 0.8 to 10.8 mol %, so that lattice lengths of the LiNbO.sub.3 monocrystalline thin film waveguide and the LiTaO.sub.3 monocrystalline substrate are matched with each other with the following relationship being satisfied;
Dependencies are inferred from the claim text.