Nonlinear carrier dynamics in a quantum dash optical amplifier

Per Lunnemann (1) , Sara Ek (1) , Kresten Yvind (1) , Rozenn Piron (2) , Jesper Mørk (1)

1 Department of photonics engineering
2 FOTON - Fonctions Optiques pour les Technologies de l'informatiON

The results of experimental pump-probe spectroscopy of a quantum dash optical amplifier biased at transparency are presented. Using strong pump pulses we observe competition between free carrier absorption and two-photon-induced stimulated emission that can have drastic effects on the transmission dynamics. Thus, both an enhancement as well as a 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.

Domaines: Optique / photonique

Per Lunnemann, Sara Ek, Kresten Yvind, Rozenn Piron, Jesper Mørk. Nonlinear carrier dynamics in a quantum dash optical amplifier. New Journal of Physics, 2012, 14, pp.013042. ⟨10.1088/1367-2630/14/1/013042⟩. ⟨hal-00663138⟩