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Influence of the carrier density dependence of the absorption on the harmonic distortion in semiconductor lasers

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1 Author(s)
Geert Morthier ; University of Gent-IMEC, Gent, Belgium

It is shown that the carrier density dependence of the absorption can result in a significant increase of the harmonic distortion caused by gain suppression or by spatial hole burning in distributed-feedback (DFB)-lasers. This carrier density dependence of the absorption is often neglected in theoretical studies, but the author found that it may result in a dominant contribution to the second-order distortion in the AM response, especially at high output powers. The distortion then mainly depends on material parameters such as differential gain, differential absorption and the gain suppression coefficient.

Published in:

Journal of Lightwave Technology  (Volume:11 ,  Issue: 1 )