Effects of drift and diffusion current flow on the high-speed performance of quantum well lasers

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Abstract
A new approach is described to incorporate the effects of drift and diffusion into the small signal transfer function of the quantum well semiconductor laser. The differential gain parameter is represented by the differential stimulated lifetime and is a constant, power‐independent parameter. The nonlinear gain factor is not required in the analysis with the saturation of the resonant frequency resulting instead from the effects of diffusion current flow through the active layer. The electron and photon rate equations used are interrelated by the Fermi energy as a parametric variable.