Patent ID: 6117346
Filing Date: 2000-09-12
Classification: C30B,G02F

Abstract:
A process for forming a ridged optical waveguide layer at a surface of a substrate made of a ferroelectric single crystal, said process comprising the steps of:subjecting the substrate to a single-poling treatment, thereby exposing at least one of an etching-easy surface and an etching-difficult surface to one of the main faces of the substrate, while exposing the other of said at least one of an etching-easy surface and an etching-difficult surface to the other main face of said substrate;forming a domain-inverted region in at least one of the main faces of the substrate, wherein said etching-difficult surface is exposed at the domain-inverted region in one of the main faces of the ferroelectric single crystal substrate; andforming said ridged optical waveguide layer at the substrate in the domain-inverted region of the substrate by selectively etching the substrate.