Gain recovery dynamics are studied in electrically pumped quantum dot (QD) based semiconductor optical amplifiers (SOAs) after amplification of double femtosecond laser pulses using ultrafast pump-probe spectroscopy with heterodyne detection. The authors observe a distinct change in gain recovery in the ground state when a significant excited state population is achieved. A complete gain recovery is found when two 150 fs pulses with 5 ps time delay pass through the SOA in resonance to the ground state under high injection currents of 80-100 mA. The obtained results open the way for ultrafast (> 200 GHz) operation in p-doped QD based SOAs at 1.3 mu m telecommunications wavelengths. (c) 2007 American Institute of Physics.
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