Patent ID: 7602831

Claim:
A semiconductor laser device comprising: a substrate having a first surface and a second surface opposite to the first surface; an active region formed on the second surface of the substrate; a cladding layer formed on the active region; an insulation region embedded in the cladding layer and extending in a direction perpendicular to the surfaces of the substrate and toward the active region, wherein only an upper surface of the insulation region is exposed to an outside of the device; a first laser region having a first size disposed on one portion of an exposed surface of the cladding layer; and a second laser region having a second size different from the first size disposed on another portion of the exposed surface of the cladding layer, wherein the first laser region is adapted to generate a first optical spectrum having a first laser mode channel space, and the second laser region is adapted to generate a second optical spectrum having a second laser mode channel space, allowing a combination of the first optical spectrum and the second optical spectrum to form a single mode laser; and wherein the insulation region is embedded in the cladding layer in a position between the first and second laser regions.