TY - JOUR
T1 - Effects of two-photon absorption on carrier dynamics in quantum-dot optical amplifiers
AU - Ju, H.
AU - Uskov, A.V.
AU - Nötzel, R.
AU - Li, Z.
AU - Molina Vázquez, J.
AU - Lenstra, D.
AU - Khoe, G.D.
AU - Dorren, H.J.S.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
U2 - 10.1007/s00340-005-2107-8
DO - 10.1007/s00340-005-2107-8
M3 - Article
SN - 0946-2171
VL - 82
SP - 615
EP - 620
JO - Applied Physics B: Lasers and Optics
JF - Applied Physics B: Lasers and Optics
IS - 4
ER -