Rate equations are used to show that the modulation response of quantum dot lasers can be limited by entropy change due to carrier relaxation from a wetting layer. The entropy change is due to the difference in the spectral density of quantum states between the two-dimensional wetting layer and the zero-dimensional quantum dot. When limited by this effect, the laser’s 3 dB modulation response becomes strongly temperature dependent.
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Deppe et al. (2000) studied this question.
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