Picosecond pulses are observed to exhibit large frequency shifts (∼50 GHz) and spectral distortion on propagation through semiconductor laser optical amplifiers. The spectral changes are shown to result from self-phase modulation occurring due to the carrier-induced index changes that invariably accompany gain saturation. An analytic model for pulse amplification is presented by including the self-phase modulation effects. Its predictions are in good agreement with the experimental results.
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Olsson et al. (1989) studied this question.
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