Simple analysis of carrier transport and buildup in separate confinement heterostructure quantum well lasers

A simple, analytical model for carrier transport and buildup in the separate confinement layer of a quantum well laser is developed. The time constant characterizing the low-frequency roll-off is separated into components describing electron and hole transport and components related to the charge storage effects arising from electron and hole capture. In contrast to previous work, the analysis shows that both the transport and capture related delays are sensitive to the placement of the well within the separate confinement heterostructure and that the carrier concentrations change abruptly across the quantum well.<>