Patent ID: 6134368
Filing Date: 2000-10-17
Classification: H01S

Abstract:
A method for making an optical semiconductor device, comprising the steps of:forming a first mask and a second mask which selectively cover a planar surface of a semiconductor substrate of a first conductivity-type in mirror-symmetry to each other;forming an optical waveguide composed of a multilayer structure including an active layer on said planar surface enclosed by said first and second masks by a selective epitaxial growth method, said optical waveguide having sidewalls with a specific crystalline plane;forming a third mask and a fourth mask selectively covering said planar surface while sandwiching said optical waveguide and a fifth mask covering the top surface of said optical waveguide after removing said first and second masks;forming a semiconductor current blocking structure composed of a bottom layer consisting of a second semiconductor layer of a second conductivity-type and a top layer consisting of a semiconductor layer of said first conductivity-type, formed on said second semiconductor layer, on a region which is not covered by said third, fourth and fifth masks by the selective epitaxial growth method, so that only the bottom layer of said semiconductor current blocking structure is in contact with sidewall surfaces of said optical waveguide; andforming a first semiconductor layer of a second conductivity type by a selective epitaxial growth method after removing said fifth mask.