Time-domain traveling wave models for the modeling and simulation of semiconductor laser optical amplifiers

A variety of time-traveling wave models have been implemented based on the spectrum slicing technique for the investigation of semiconductor laser optical amplifiers. One of the key differences among these models lies in their treatment of the phase of the interacting optical waves (signals and noises). Based on this criterion, the models are classified into the full-wave (phases of both signal and noise considered), the half-wave (only signal phase considered), and the full-power (all phases neglected) models. This study has confirmed theoretically the consistency of the models by showing that these three models are identical in terms of the amplified spontaneous emission (ASE) power if there is no input signal injected. Numerical simulation also shows that all these three models give exactly the same ASE power spectrum.