Nonlinear carrier dynamics in a quantum dash optical amplifier
Per Lunnemann, Sara Ek, Kresten Yvind, Rozenn Piron, Jesper M{\o}rk
TL;DR
This paper investigates the complex nonlinear carrier dynamics in a quantum dash optical amplifier using pump-probe spectroscopy, revealing competing absorption and emission processes that affect transmission.
Contribution
It introduces a simple theoretical model incorporating two-photon and free carrier absorption that aligns well with experimental observations.
Findings
Observation of competition between free carrier absorption and stimulated emission
Both enhancement and suppression of transmission at transparency bias
Good agreement between the model and experimental results
Abstract
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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