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US 5,479,552 AGranted
Waveguide-type optical device
AssigneeNEC Corporation
InventorsNaoki Kitamura, Hiroshi Nishimoto
Life of this patent
Estimating the term…
Abstract
In a waveguide-type optical device, two optical waveguides are formed in a substrate of LiNbO.sub.3 or LiTaO.sub.3. 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 SiO.sub.2 is formed. Each of the 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.
Claims7
A waveguide-type optical device comprising:
- a substrate of electrooptical material;
- first and second optical waveguides formed in the substrate;
- a substrate ion blocking layer formed on said substrate and said first and second optical waveguides;
- a buffer layer, a refractive index of which is smaller than that of said substrate, formed on said blocking layer;
- and
- first and second electrodes which cover a coupling part of each of said first and second optical waveguides respectively via said buffer layer and said blocking layer.
3 more elements
Dependencies are inferred from the claim text.