Effect of excited states on the ground-state modulation bandwidth in quantum dot lasers
Effect of excited states on the ground-state modulation bandwidth in quantum dot lasers
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DOI：
10.1063/1.4804994
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发表时间：
2013-05
影响因子：
4
通讯作者：
Yuchang Wu;R. Suris;L. Asryan
中科院分区：
文献类型：
--
作者：
Yuchang Wu;R. Suris;L. Asryan
我们考虑了量子点(QD)中直接和间接(激发态中介)将载流子从波导区俘获到激光基态的情况，并计算了QD激光器的调制响应。结果表明，当只考虑间接俘获时，激发态到基态的弛豫延迟强烈地限制了激光器的基态调制带宽--在最长的可容忍弛豫时间，带宽变为零。当考虑直接俘获时，激发基态弛豫的影响较小，调制带宽较高。
We consider direct and indirect (excited-state-mediated) capture of carriers from the waveguide region into the lasing ground state in quantum dots (QDs) and calculate the modulation response of a QD laser. We show that, when only indirect capture is involved, the excited-to-ground-state relaxation delay strongly limits the ground-state modulation bandwidth of the laser—at the longest tolerable relaxation time, the bandwidth becomes zero. When direct capture is also involved, the effect of excited-to-ground-state relaxation is less significant and the modulation bandwidth is considerably higher.