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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.54: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Ultrafast gain dynamics in InGaAs quantum dot based semiconductor optical amplifiers — Jordi Gomis-Bresco¹, Sabine Dommers¹, Vasily Temnov¹, Ulrike Woggon¹, Matthias Lämmlin², Dieter Bimberg², •Ermin Malic³, Marten Richter³, Eckehard Schöll³, and Andreas Knorr³ — ¹Institut für Optik und Atomare Physik, Technische Universität Berlin — ²Institut für Festkörperphysik, Technische Universität Berlin — ³Institut für Theoretische Physik, Technische Universität Berlin

The application of quantum dot (QD) semiconductor optical amplifiers (SOAs) in high-speed ethernet networks demands a high frequency response. To understand the elementary processes limiting the recovery time in quantum dot based SOAs, we present pump-probe studies of femtosecond pulse trains with up to 1 THz repetition rates and investigate the gain response of a QD-SOA at high electrical injection current and elevated device temperatures.

We discuss fundamental limits for THz optical pulse train amplification based on semiconductor Bloch equations including microscopically calculated, temperature-dependent Coulomb scattering rates between quantum dot and wetting layer states.