Patent ID: 7349593

Claim:
A method for fabricating an optical device comprising the steps of: forming a sacrificial layer of GSG (germanium-added silica glass) on a silicon substrate: forming a wave guide structure having an under-clad layer and an over-clad layer of BPSG (boron-and-phosphorus-added silica glass) or PSG (phosphorus-added silica glass) and a core layer of GPSG (gennanium-and-pbosphorus-added silica glass) formed between the under-clad layer and the over-clad layer; forming the shape of a movable part having a V-shaped end face, and a wave guide end face by applying anisotropic etching of the over-clad layer and the under-clad layer or the core layer reaching the sacrificial layer; forming metal films on the V-shaped end face, and forming electrodes on both sides of the movable part; and separating the movable part from the substrate by removing the sacrificial layer beneath the movable part by applying isotropic etching.