We observe experimentally that a quantum-well electroabsorption modulator, when strongly saturated by a highly energetic optical pulse, may exhibit an absorption recovery time much longer than for excitation with a low-energy pulse. Using a comprehensive drift-diffusion. type model, we are able to explain this effect theoretically. The. prolongation of the absorption recovery is induced by carrier distribution effects, not by field-induced changes in the dynamical transport parameters such as the time carriers take to escape from the wells.
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Højfeldt, S., Romstad, F., & Mørk, J. (2003). Absorption recovery in strongly saturated quantum-well electroabsorption modulators. I E E E Photonics Technology Letters, 15(5), 676-678. https://doi.org/10.1109/LPT.2003.809986