Patent ID: 6639241
Filing Date: 2003-10-28
Classification: H01S

Abstract:
A semiconductor optical device comprising:a first cladding layer, a first guide layer, an active layer, a second guide layer and a ridge waveguide stripe comprising a second cladding layer extending in a light-waveguiding direction disposed successively on a semiconductor substrate; and a first and a second semiconductor ridge waveguide stripe protected layer, which are formed substantially at an identical height with the ridge waveguide stripe and spaced apart from the ridge waveguide stripe, and which are disposed on both sides of the ridge waveguide stripe, wherein a first and a second recessed region lower than the top of the ridge waveguide stripe are present between each of the first and the second semiconductor ridge waveguide stripe protected layer and the ridge waveguide stripe; and a first and a second region for obstructing the conductivity of the active layer is present in the same direction as the light-waveguiding direction of the ridge waveguide stripe in the first and the second recessed region respectively, and the shortest distance or the shortest gap between one end of the ridge waveguide stripe and one end of the second region is 2 &mgr;m or more and less than 10 &mgr;m.