In this paper, we have proposed a procedure to analyze transient response of bistable distributed feedback semiconductor laser amplifiers (DFB-SLAs). The results of the analysis show among bistable DFB-SLA's with different gratings including uniform, quarter wavelength phase-shifted (QWS), and tapered, a tapered DFB-SLA has the best switching behavior. This behavior includes relaxation oscillation, switching-on time and switching-off time of the output pulse for an input pulse. The transfer matrix and the finite difference time-domain methods are utilized for simulating all results.
Keywords-distributed feedback semiconductor laser amplifier (DFB-SLA), `trapezoidal tapering, optical dispersive bistability, switching behavior.I.