Mode-Locking and Noise Characteristics of InAs/InP Quantum Dash/Dot Lasers

The mode-locking and noise characteristics of InP/InAs quantum dash (QDash) and quantum dot (QDot) multi-wavelength lasers, showing identical structural design, operating at the C -band, are investigated and compared to each other. The QDash lasers exhibit improved repetition frequency stability wit...

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Bibliographic Details
Published in:Journal of lightwave technology 2023-07, Vol.41 (13), p.4262-4270
Main Authors: Liu, Guocheng, Poole, Philip J., Lu, Zhenguo, Liu, Jiaren, Song, Chun-Ying, Mao, Youxin, Barrios, Pedro
Format: Article
Language:English
Subjects:
Coherent comb lasers
coherent Terabit/s networking systems
Frequency stability
Indium arsenides
Indium phosphides
integrated optics devices
Laser mode locking
Lasers
Measurement by laser beam
Mode locking
Noise intensity
Optical pulses
quantum dash
Quantum dot lasers
quantum dot semiconductor mode-locked lasers
Quantum dots
Quantum efficiency
Radio frequency
Relative intensity noise
Repetition
Semiconductor lasers
Structural design
Threshold currents
Waveguide lasers
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Summary:The mode-locking and noise characteristics of InP/InAs quantum dash (QDash) and quantum dot (QDot) multi-wavelength lasers, showing identical structural design, operating at the C -band, are investigated and compared to each other. The QDash lasers exhibit improved repetition frequency stability with a lower threshold current and cavity loss. On the other hand, the QDot lasers show higher quality repetition frequency tunability with higher internal quantum efficiency, as well as lower average integrated relative intensity noise (RIN) and average optical linewidth. Furthermore, we demonstrate both the QDash and QDot lasers exhibit very clean constellation diagrams at 32 GBaud 16QAM base-band signal, while the QDot lasers' bit-error ratio (BER) performance outperforms the QDashes. This finding highlights the viability of InAs/InP QDash/QDot lasers to be used as a low-cost optical source for large-scale networks.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2023.3244777