Patent ID: 7629187

Claim:
A fabrication method of a semiconductor luminescent device comprising: forming a compound semiconductor layer having a structure in which a first conductivity-type clad layer, an active layer, a second conductivity-type clad layer are layered in order on a substrate, the second conductivity-type being different from the first conductivity-type; and forming a low-refractive-index region in a waveguide in an area to be an end face from which an output light from the waveguide in the compound semiconductor layer is emitted, the low-refractive-index region having an equivalent refractive-index lower than that of another area in the waveguide, wherein the step of forming the low-refractive-index region comprises forming the low-refractive-index regions in the semiconductor luminescent devices in a wafer so as to have a width in a longitudinal direction of the waveguide, the widths being different from each other.