Intensity Noise and Pulse Oscillations of an InAs/GaAs Quantum Dot Laser on Germanium
Intensity Noise and Pulse Oscillations of an InAs/GaAs Quantum Dot Laser on Germanium
复制标题
锗上 InAs/GaAs 量子点激光器的强度噪声和脉冲振荡
DOI:
10.1109/jstqe.2019.2917548
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发表时间:
2019-05
影响因子:
4.9
通讯作者:
Cheng Wang
中科院分区:
文献类型:
--
作者:
Yue-Guang Zhou;Jianan Duan;Heming Huang;Xu-Yi Zhao;Chun-Fang Cao;Qian Gong;Frederic Grillot;Cheng Wang
This paper investigates the intensity noise and pulse oscillation characteristics of an InAs/GaAs quantum dot laser epitaxially grown on germanium. We show that the relative intensity noise of the free-running laser generally decreases with increasing pump current, and the minimum value reaches down to about $-$126 dB/Hz. The intensity noise is hardly affected by the optical feedback, unless there is a resonance or pulse oscillation in the noise spectrum. The laser pumped at a high current is more sensitive to the optical feedback. Interestingly, it is found that the free-running Ge-based quantum dot laser generates self-sustained pulse oscillations with one period or two periods upon the pump current, without incorporating saturable absorbers. This behavior is valuable for both self-generation of photonic microwaves and for understanding nonlinear dynamics of semiconductor lasers.
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