Effect of nonlinear gain reduction on semiconductor laser wavelength chirping

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Abstract
A simple wavelength chirping formula is presented which includes small nonlinearities in the net gain such as spectral hole burning. The two dominant terms are a laser-structure-independent derivative or ‘‘transient’’ chirp and a structure-dependent ‘‘adiabatic’’ chirp, each with distinctly different lightwave system consequences. The two chirp contributions are indirectly related through their mutual association with relaxation oscillations. Time-resolved spectral measurements on a number of different laser structures support the results.