Transient time-averaged spectra of rapidly-modulated semiconductor lasers

Using the computed solution of multimode rate equations, and including wavelength-chirping effects via the dependence of the refractive index on carrier concentration, it is possible to calculate time-averaged spectra of rapidly-modulated lasers. The averaging time may be used to simulate the effects of measuring equipment with a specific time response. The results show a characteristic fine structure within the dominant longitudinal mode spectrum, and are in qualitative agreement with experimental measurements reported by other authors.