Applied Physics B

, Volume 82, Issue 4, pp 615–620

Effects of two-photon absorption on carrier dynamics in quantum-dot optical amplifiers

  • H. Ju
  • A.V. Uskov
  • R. Nötzel
  • Z. Li
  • J. Molina Vázquez
  • D. Lenstra
  • G.D. Khoe
  • H.J.S. Dorren
Article

DOI: 10.1007/s00340-005-2107-8

Cite this article as:
Ju, H., Uskov, A., Nötzel, R. et al. Appl. Phys. B (2006) 82: 615. doi:10.1007/s00340-005-2107-8

Abstract

We investigate ultrafast gain-dynamics in a quantum-dot (QD) semiconductor optical amplifier where two-photon absorption (TPA) occurs in the bulk region of the waveguide during propagation of a sub-picosecond optical pulse, and gain bleaching occurs in the QD active region. Our calculation reveals that TPA provides optical pumping which is quasi-synchronous in time and space with QD carrier depletion, leading to enhancement of carrier capture into the QDs on an ultrafast timescale. The TPA-induced optical pumping, which is qualitatively different from electrical pumping, changes qualitatively carrier recovery dynamics, reducing pattern effects when a train of optical pulses is injected at the ultra-high speed.

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • H. Ju
    • 1
  • A.V. Uskov
    • 1
    • 2
  • R. Nötzel
    • 1
  • Z. Li
    • 1
  • J. Molina Vázquez
    • 1
  • D. Lenstra
    • 1
    • 3
  • G.D. Khoe
    • 1
  • H.J.S. Dorren
    • 1
  1. 1.COBRA Research InstituteEindhoven University of TechnologyEindhovenThe Netherlands
  2. 2.P.N. Lebedev Physical InstituteMoscowRussia
  3. 3.Department of Physics and AstronomyFEW Vrije UniversiteitAmsterdamThe Netherlands