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
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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
Cheng Wang
中科院分区:
工程技术2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

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本文研究了在锗上外延生长的 InAs/GaAs 量子点激光器的强度噪声和脉冲振荡特性。我们表明,自由运行激光器的相对强度噪声通常随着泵浦电流的增加而降低,最小值达到约 $-$126 dB/Hz。强度噪声几乎不受光反馈的影响,除非噪声频谱中存在共振或脉冲振荡。以高电流泵浦的激光器对光学反馈更敏感。有趣的是,我们发现自由运行的Ge基量子点激光器在泵浦电流的作用下产生一个周期或两个周期的自持脉冲振荡,而不需要结合饱和吸收器。这种行为对于光子微波的自生成和理解半导体激光器的非线性动力学都很有价值。
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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