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Intensity Noise and Pulse Oscillations of an InAs/GaAs Quantum Dot Laser on Germanium.
- Source :
- IEEE Journal of Selected Topics in Quantum Electronics; Nov/Dec2019, Vol. 25 Issue 6, p1-10, 10p
- Publication Year :
- 2019
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1077260X
- Volume :
- 25
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- IEEE Journal of Selected Topics in Quantum Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 140085113
- Full Text :
- https://doi.org/10.1109/JSTQE.2019.2917548