Effect of Inhomogeneous Broadening on Gain and Phase Recovery of Quantum-Dot Semiconductor Optical Amplifiers
Effect of Inhomogeneous Broadening on Gain and Phase Recovery of Quantum-Dot Semiconductor Optical Amplifiers
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DOI：
10.1109/jqe.2010.2058793
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发表时间：
2010-11-01
影响因子：
2.5
通讯作者：
Eisenstein, Gadi
中科院分区：
文献类型：
--
作者：
Kim, Jungho;Meuer, Christian;Eisenstein, Gadi
数值研究了量子点尺寸涨落引起的非均匀展宽对量子点半导体光放大器增益和相位恢复的影响。我们建立了1088个耦合速率方程来模拟量子点系综随非均匀加宽的载流子动力学。当所有的量子点系综是相同的，非均匀展宽为零，八个耦合速率方程求解均匀量子点。计算了超短抽运脉冲注入量子点SOA时的增益和相位恢复响应。随着非均匀加宽的增加，在QD基态的相恢复的慢分量增加，这是由于来自诸如QD激发态的载流子库的慢相恢复的放大贡献。通过分别计算具有不同尺寸的均匀量子点的增益和相位恢复响应，我们确定了增加非均匀加宽如何影响从载流子库中放大的慢相位恢复分量。我们还表明，非均匀加宽的a-因子的时间变化的效果是更显着的注入泵浦功率相比。
We numerically investigate the effect of inhomogeneous broadening caused by quantum-dot (QD) size fluctuations on the gain and phase recovery of QD semiconductor optical amplifiers (SOAs). We establish 1088 coupled rate equations to simulate the carrier dynamics of the inhomogeneously broadened QD ensembles as inhomogeneous broadening increases. When all the QD ensembles are identical and inhomogeneous broadening becomes zero, eight coupled rate equations are solved for the homogeneous QDs. The gain and phase recovery responses are calculated when an ultrashort pump pulse is injected into a QD SOA. As the inhomogeneous broadening increases, the slow component of the phase recovery at the QD ground state increases due to the enlarged contribution from the slow phase recovery of carrier reservoirs such as the QD excited states. By separately calculating the gain and phase recovery responses of the homogeneous QDs with different sizes, we identify how increasing inhomogeneous broadening affects the enlarged slow phase recovery components from carrier reservoirs. We also demonstrate that the effect of inhomogeneous broadening on the temporal variation of the a-factor is more significant compared to the injection pump power.