Patent ID: 7602830

Claim:
A method of manufacturing a monolithic semiconductor laser having plural semiconductor lasers having different emission wavelengths, comprising: preparing a semiconductor substrate; stacking within a first area on the semiconductor substrate a first semiconductor layer including a first double hetero-structure in which an active layer is disposed between an upper and a lower clad layers; stacking within a second area on the semiconductor substrate a second semiconductor layer including a second double hetero-structure in which an active layer is disposed between an upper and a lower clad layers; forming an etching-resistant pattern film on the first double hetero-structure which is formed within the first area and the second double hetero-structure which is formed within the second area; and simultaneously forming a plurality of first stripes in the first double hetero-structure, the first stripes defined by a plurality of first trenches formed adjacent the first stripes, and a plurality of second stripes the second double hetero-structure, the second stripes defined by a plurality of second trenches formed adjacent the second stripes, using the pattern film, wherein the second trenches are formed to a greater depth than a depth of the first trenches.