Transmission line model for strained quantum well lasers including carrier transport and carrier heating effects

The paper reports a new model for strained quantum well lasers which is based on quantum well transmission line modelling method where effects of both carrier transport and carrier heating have been included. We have applied this new model and studied the effect of carrier transport on the output waveform of a strained quantum well laser both in time and frequency domains. It has been found that the carrier transport increases the turn-on, turn-off delay times and damping of the quantum well laser transient response. Also, analysis in frequency domain indicates that the carrier transport causes the output spectrum of quantum well laser in steady state exhibits a red shift which has a narrower bandwidth and lower magnitude. The simulation results of turning-on transients obtained by the proposed model are compared with that obtained by the rate equation laser model. The new model has also been used to study the effects of pump current spike on the laser output waveforms properties and it was found that the presence of current spike causes (i) wavelength red shift, (ii) larger bandwidth, (iii) reduces the magnitude and decreases the side-lobes suppression ratio (SLSR) of the laser output spectrum. Analysis in both frequency and time domains confirms that the new proposed model can accurately predict the temporal and spectral behaviors of strained quantum well lasers.