LARGE CARRIER-EFFECT RED SHIFT IN LAMBDA 4-SHIFTED DFB LASERS WITH IN-PHASE COMPLEX GRATING/

Theoretical analysis of the wavelength tuning characteristics shows th at the carrier effect in lambda/4-shifted DFB lasers with in-phase com plex grating can produce a large red shift while maintaining stable si nglemode operation. The FM response of these lasers can thus avoid hav ing any dip at lower modulation frequencies, where the thermal red shi ft opposes the carrier blue shift of conventional lasers.