Effects of two-photon absorption on carrier dynamics in quantum-dot optical amplifiers |
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| Authors: | H. Ju A.V. Uskov R. Nötzel Z. Li J. Molina Vázquez D. Lenstra G.D. Khoe H.J.S. Dorren |
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| Affiliation: | (1) COBRA Research Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;(2) P.N. Lebedev Physical Institute, 117924 Moscow, Russia;(3) Department of Physics and Astronomy, FEW Vrije Universiteit, Amsterdam, The Netherlands |
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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. PACS 85.60.Bt; 42.79.-e; 07.60.-j |
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