A new time‐domain model for spontaneous emission in semiconductor lasers and its use in predicting their transient response

Spontaneous emission noise power, although small in magnitude, affects many aspects of the semiconductor laser's operation. An accurate model has been developed for it for use in the transmission‐line laser model (TLLM), which is a time‐domain, wideband, dynamic, non‐adiabatic semiconductor laser model. The effects of approximations used in other dynamic laser models are then investigated by comparison with the results from the TLLM. The study shows that the representation of this noise power has an important bearing on the damping of modelled transient oscillations.