Patent ID: 7060518

Claim:
A method used for fabricating a semiconductor optical device by using mass transport, said method comprising the steps of: forming a stacked body by successively growing at least a cladding layer having a first conductivity, an active region formed by an photoabsorption layer or an active layer, and a cladding layer having a second conductivity; forming a mask of a predetermined shape, and etching said stacked body by using said mask, so that a mesa stripe is formed; etching both sides of said active region by performing selective etching such that the width of said active region becomes smaller than the width of said cladding layers in said stacked body; burying said both sides of said active region with a semi-insulating InP layer by mass transport while supplying a source material gas including Ru; and burying both sides of said stacked body with a Ru-doped semi-insulating semiconductor.