Ultrafast dynamics of quantum-dot semiconductor optical amplifiers
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We report on a series of experiments on the dynamical properties of quantum-dot semiconductor optical amplifiers. We show how the amplifier responds to one or several ultrafast (170 fs) pulses in rapid succession and our results demonstrate applicability and ultimate limitations to application of quantum-dot amplifiers in e.g. amplification of signals in a telecommunications system. We also review experiments on pulse propagation control and show the possibility to slow down or speed up 170 fs pulses in a quantum-dot based device.
KeywordsPump Pulse Saturable Absorber Semiconductor Optical Amplifier Saturation Regime Fractional Delay
Alexey Kovsh of the Ioffe Institute (now at NL semiconductor) is acknowledged for growing the QD sample. Matthias Laemmlin and Dieter Bimberg of Technische Universit¨at Berlin are acknowledged for wafer processing. This project was supported by the EU-IST project DOTCOM (project no. IST-2000-28713).
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