Patent ID: 6865204
Filing Date: 2005-03-08
Classification: H01S

Abstract:
1. A ridge waveguide type photo semiconductor device comprising: a first cladding layer of a first conductivity type which is formed on a semiconductor substrate of the first conductivity type; an active layer which is formed on said first cladding layer; a second cladding layer of a second conductivity type which is formed on said active layer; a third cladding layer of the second conductivity type which is formed on said second cladding layer and which is worked so as to have a ridge shape; and an impurity diffusion region which is formed in said second cladding layer and said active layer on both sides of said ridge-shaped third cladding layer and which has a higher resistance value than that of said second cladding layer below said ridge shape, said impurity diffusion region being a region into which proton ions are implanted and which prevents a current injected into the active layer from diffusing to both sides of said ridge-shaped third cladding layer.