By using different separate confinement structures for otherwise identical quantum well lasers, we find experimentally that the differential gain can vary over a factor of three, which significantly affects the high speed modulation bandwidth in such lasers. These observations are in agreement with the predictions of a theory of modulation dynamics which accounts for the carrier population in the optical confining region of the separate confinement structure (state filling effect) in quantum well lasers.
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Zhao et al. (1992) studied this question.
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