Patent ID: 7772023

Claim:
A method of producing a semiconductor optical device comprising: a step of growing, on one surface of a semiconductor substrate, a group III-V compound semiconductor layer which includes a cladding layer of a first conductivity type, an active layer, and a Zn-doped cladding layer of a second conductivity type; a step of forming a semiconductor mesa part on the semiconductor substrate by etching the group III-V compound semiconductor layer using a predetermined mask; a step of supplying a source material containing Si and a group V source material containing phosphorus and thermally decomposing the source material containing Si on the one surface of the semiconductor substrate and side surfaces of the semiconductor mesa part; a step of, successively to the step of supplying a source material containing Si and a group V source material containing phosphorus, supplying a group III source material containing indium and the group V source material containing phosphorus after stopping the supply of the source material containing Si a to form a Si-doped InP layer on the one surface of the semiconductor substrate and the side surfaces of the semiconductor mesa part, the Si-doped InP layer being doped the Si atoms adsorbed on the one surface of the semiconductor substrate and side surfaces of the semiconductor mesa part; and a step of continuously supplying the group III source material containing indium and a source material containing iron to grow an Fe-doped InP layer which buries the semiconductor mesa part on the one surface of the semiconductor substrate.