Feedback and injection locking instabilities in quantum-dot lasers: a microscopically based bifurcation analysis
Feedback and injection locking instabilities in quantum-dot lasers: a microscopically based bifurcation analysis
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DOI：
10.1088/1367-2630/15/9/093031
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发表时间：
2013-09
影响因子：
3.3
通讯作者：
B. Lingnau;W. Chow;E. Schöll;K. Lüdge
中科院分区：
文献类型：
--
作者：
B. Lingnau;W. Chow;E. Schöll;K. Lüdge
我们采用基于微观半导体理论的非平衡能量平衡和载流子速率方程模型来描述光注入和延时反馈下的量子点（QD）激光动力学。该模型超越了速率方程的典型唯象近似（例如 α 因子），但允许进行彻底的数值分岔分析，而这对于计算要求较高的微观方程来说是不可能的。我们发现，使用 QD 激光器，独立的振幅和相位动力学可能会导致光学扰动下的情况比使用 α 因子描述载流子引起的折射率变化的传统模型预测的情况要简单。例如，在短外腔反馈状态下，实际上需要更高的临界反馈强度来引起不稳定性。一般来说，只有当载流子分布可以绝热地遵循 QD 激光动力学时才应使用 α 因子。
We employ a nonequilibrium energy balance and carrier rate equation model based on microscopic semiconductor theory to describe the quantum-dot (QD) laser dynamics under optical injection and time-delayed feedback. The model goes beyond typical phenomenological approximations of rate equations, such as the α-factor, yet allows for a thorough numerical bifurcation analysis, which would not be possible with the computationally demanding microscopic equations. We find that with QD lasers, independent amplitude and phase dynamics may lead to less complicated scenarios under optical perturbations than predicted by conventional models using the α-factor to describe the carrier-induced refractive index change. For instance, in the short external cavity feedback regime, higher critical feedback strength is actually required to induce instabilities. Generally, the α-factor should only be used when the carrier distribution can follow the QD laser dynamics adiabatically.