Nonlinear carrier dynamics in a quantum dash optical amplifier

Details Nonlinear carrier dynamics in a quantum dash optical amplifier Nonlinear carrier dynamics in a quantum dash optical amplifier

2011-11-11

arxiv.org/abs/1111.2757v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Results of experimental pump-probe spectroscopy of a quantum dash optical amplifier biased at transparency are presented. Using strong pump pulses we observe a competition between free carrier absorption and two-photon induced stimulated emission that can have drastic effects on the transmission dynamics. Thus, both enhancement as well as suppression of the transmission can be observed even when the amplifier is biased at transparency. A simple theoretical model taking into account two-photon absorption and free carrier absorption is presented that shows good agreement with the measurements.

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