摘要:
The ridge semiconductor laser 301 is a semiconductor laser in which a carrier stopper layer 16 made of an AlInAs compound, a clad layer 17 made of an AlGaInAs compound, and an etching stopper layer 18 made of an InGaAsP compound are stacked in sequence on one side of an active layer 14 made of an AlGaInAs compound. The ridge semiconductor laser 301 is provided with a ridge waveguide 40 including, in a layer made of an InP compound, a diffraction grating 20' made of an InGaAsP compound on the opposite side of the clad layer 17 of the etching stopper layer 18.