METHOD FOR FABRICATING LOW TEMPERATURE OPERATION SEMICONDUCTOR LASER

摘要

PROBLEM TO BE SOLVED: To provide a distribution feedback type laser having a low threshold value in which low temperature performance is improved. SOLUTION: Probability of laser oscillation occurring in the vicinity of the short wavelength side of a stop band is increased using an active layer 18, a spacer layer 16 and a loss grating layer 14 and the effect of negative gain inclination occurring at the time of detuning of a DFB laser in the positive direction is canceled thus obtaining a method for fabricating a DFB laser having an improved side mode suppression ratio(SMSR) at low temperature.