DISPERSIVE SELF-Q-SWITCHING IN DFB LASERS - THEORY VERSUS EXPERIMENT

The single-mode model of dispersive self-Q-switching is extended to la sers containing a phase tuning section, The parameter set used for mod eling is taken from independent measurements on existing self-pulsatin g devices. Detuning of the Bragg wavelengths by current induced heatin g is found, and this effect is included in the model. Calculated self- pulsation characteristics were compared quantitatively with experiment al results on the device. A very good correspondence between theory an d experiment is obtained, ag., for conditions generating self-pulsatio ns and for the frequency-current dependence. Dispersive self-Q-switchi ng thus is confirmed a responsible mechanism for the high frequency DF B type self-pulsations. The modeling further shows that the delay betw een the stimulated emission within the device and the radiation of pho tons from the facets plays an important role for keeping the pulsation s running.