Ultra-broadband quantum dot coherent comb lasers

Guocheng Liu; Zhenguo Lu; Chun-ying Song; Philip J. Poole; Jiaren Liu; Martin Vachon; Xiaoran Xie; Yang Qi; John Weber; Youxin Mao; Pedro Barrios; Philip Waldron; Mohamed Rahim

doi:10.1117/12.3003151

8 March 2024 Ultra-broadband quantum dot coherent comb lasers

Guocheng Liu, Zhenguo Lu, Chun-ying Song, Philip J. Poole, Jiaren Liu, Martin Vachon, Xiaoran Xie, Yang Qi, John Weber, Youxin Mao, Pedro Barrios, Philip Waldron, Mohamed Rahim

Author Affiliations +

Proceedings Volume 12882, Optical Components and Materials XXI; 1288204 (2024) https://doi.org/10.1117/12.3003151
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

In this work, we have investigated self-injection locking effects on a full spectral system with selective single-channel injection and full-channel injection in a quantum dot mode-locked comb laser through an optical feedback loop. It has been noticed that self-injection locking can not only improve the performance of a single-channel laser system but also has a strong effect on the whole spectral behavior. In the case of single-channel self-injection, we investigated the effects under a locked regime above the injection-locking threshold P_SIL. The locked lines were strongly enhanced with intensities high above the broad spectrum and also intensified even outside of the original spectral bandwidth. The typical feature is a big dip (or hole) appearing on the high-energy side of the lines if it is within the free-running spectral region. We have investigated this asymmetric phenomenon. It is considered that the locked modes are highly intensified at the expense of higher energy carriers excited by currents. The locking process transferred the energy from the lasing mode to the locked mode. For the full channel self-injection, the system was set under a controllable self-injection locking condition. A bandwidth enhancement phenomenon can be observed when injected power reaches the self-injection locking threshold PSIL, and the broadening gets stronger till to the locked regime. Finally, the original spectral bandwidth had been significantly broadened. This bandwidth broadening goes to both sides of the free-running spectrum and the broadening is remarkable.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Guocheng Liu, Zhenguo Lu, Chun-ying Song, Philip J. Poole, Jiaren Liu, Martin Vachon, Xiaoran Xie, Yang Qi, John Weber, Youxin Mao, Pedro Barrios, Philip Waldron, and Mohamed Rahim "Ultra-broadband quantum dot coherent comb lasers", Proc. SPIE 12882, Optical Components and Materials XXI, 1288204 (8 March 2024); https://doi.org/10.1117/12.3003151

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