A TIME-DOMAIN MODEL FOR HIGH-SPEED QUANTUM-WELL LASERS INCLUDING CARRIER TRANSPORT EFFECTS

Carrier transport plays an important role and can significantly affect the ultra-fast properties of quantum-well (QW) lasers. We present a d etailed multi-mode time-domain large-signal dynamic model including th e effects of carrier transport, suitable for the high-speed QW lasers. It is based on the well-proven transmission-line laser modelling tech nique with the addition of a multilevel system of coupled rate-equatio ns. Simulated results from studies of both the static and small-signal properties are compared with measurements from another laboratory. Ou r model can accurately predict the modulation-bandwidth discontinuity in QW laser structures with large separate-confinement-heterostructure (SCH) regions. We use large-signal simulations to predict increased d amping of transient responses and larger turn-on delays caused by the effects of carrier transport. Our large-signal simulations also show t hat an increase in the turn-on delay times is expected in QW structure s with large carrier transport times across the SCH region, whereas th e inter-well transport times do not affect the turn-on delay times sig nificantly.