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

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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.

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Authors and Affiliations

  1. COBRA Research Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands

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

  2. P.N. Lebedev Physical Institute, 117924, Moscow, Russia

    A.V. Uskov

  3. Department of Physics and Astronomy, FEW Vrije Universiteit, Amsterdam, The Netherlands

    D. Lenstra

Authors
  1. H. Ju
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  2. A.V. Uskov
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  3. R. Nötzel
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  4. Z. Li
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  5. J. Molina Vázquez
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  6. D. Lenstra
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  7. G.D. Khoe
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  8. H.J.S. Dorren
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Corresponding author

Correspondence to H. Ju.

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PACS

85.60.Bt; 42.79.-e; 07.60.-j

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Ju, H., Uskov, A., Nötzel, R. et al. Effects of two-photon absorption on carrier dynamics in quantum-dot optical amplifiers. Appl. Phys. B 82, 615–620 (2006). https://doi.org/10.1007/s00340-005-2107-8

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  • DOI: https://doi.org/10.1007/s00340-005-2107-8

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