Patent ID: 6995454

Claim:
A semiconductor optical integrated device including a light-emitting element portion, a modulation element portion and a separation portion, said light-emitting element portion, said modulation element portion and said separation portion being arranged in a prescribed axial direction, said optical integrated device comprising: a substrate; a first optical waveguide provided in said light-emitting element portion and a second optical waveguide provided in said modulation element portion, said first and second optical waveguides being disposed on said substrate; a first conductivity type semiconductor layer disposed on said first and second optical waveguides, said first and second optical waveguides and said first conductivity type semiconductor layer forming a principal mesa structure; a first electrode electrically connected to said substrate; a second electrode electrically connected to said first conductivity type semiconductor layer in said light-emitting element portion; a third electrode electrically connected to said first conductivity type semiconductor layer in said modulation element portion; and an embedded semiconductor portion provided in said first conductivity type semiconductor layer in said separation portion, said embedded semiconductor portion extending along a direction intercepting said prescribed axial direction and being filled with a semiconductor material having a second conductivity type different to said first conductivity type.