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

H. K. Ju, A. V. Uskov, R. Notzel, Z. Li, J. M. Vazquez, D. Lenstra, G.D. Khoe, H.J.S. Dorren

    Research output: Contribution to JournalArticleAcademicpeer-review

    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.
    Original languageEnglish
    Pages (from-to)615-620
    JournalApplied Physics B. Lasers and Optics
    Volume82
    Issue number4
    DOIs
    Publication statusPublished - 2006

    Bibliographical note

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

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