Temperature effects on the large signal transient response of long-wavelength MQW lasers

In this paper we investigate the effect of temperature on the transient response of multiple quantum well (MQW) 1.3 μm InP-InGaAsP lasers of the Fabry-Perot type when the injection current changes by steps from zero to a value above threshold. For the structure under study the rate equations were numerically solved for each temperature taking into account the appropriate values of the maximum gain, the threshold current density and the photon and carrier lifetime, which change with temperature. As expected the carrier and photon transients change with temperature, their evolution depending on the current density values considered at each temperature. When the ratio between the current density and the threshold current density is kept constant we observe that for an increase of temperature there is an increase of the amplitude and frequency of the oscillations and a decrease of their relaxation time and turn-on delay time. However for a constant current density the increase of temperature can lead to opposite conclusions