Impact of Coulomb Scattering on the Ultrafast Gain Recovery in InGaAs Quantum Dots
Impact of Coulomb Scattering on the Ultrafast Gain Recovery in InGaAs Quantum Dots
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DOI：
10.1103/physrevlett.101.256803
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发表时间：
2008-12-19
影响因子：
8.6
通讯作者：
Knorr, A.
中科院分区：
文献类型：
--
作者：
Gomis-Bresco, J.;Dommers, S.;Knorr, A.
量子点（QD）半导体光放大器（SOA）在100-Gbit以上以太网网络中的应用要求在类似于100 GHz重复频率的输入脉冲的时间尺度上的超快增益恢复。微观散射过程必须在尽可能短的时间尺度上起作用，并且必须探索、控制和利用加速库仑散射的机制。我们提出了一个微观描述的增益恢复耦合极化和人口动力学在热非平衡的情况下超越速率方程模型，并讨论了库仑散射的限制0 D和2D限制量子态之间。设计了一个实验，演示了在强大的电注入下，InGaAs量子点基SOA的THz脉冲序列的增益恢复的控制。
The application of quantum dot (QD) semiconductor optical amplifiers (SOAs) in above 100-Gbit Ethernet networks demands an ultrafast gain recovery on time scales similar to that of the input pulse similar to 100 GHz repetition frequency. Microscopic scattering processes have to act at shortest possible time scales and mechanisms speeding up the Coulomb scattering have to be explored, controlled, and exploited. We present a microscopic description of the gain recovery by coupled polarization- and population dynamics in a thermal nonequilibrium situation going beyond rate-equation models and discuss the limitations of Coulomb scattering between 0D and 2D-confined quantum states. An experiment is designed which demonstrates the control of gain recovery for THz pulse trains in InGaAs QD-based SOAs under powerful electrical injection.