Self-injection locking dual-DFB lasers based on a micro-resonator for ultra-low noise microwave generation

Laiyang Dang; Dongmei Huang; Chao Wang; Yujia Li; Feng Li

doi:10.1117/12.3023345

18 March 2024 Self-injection locking dual-DFB lasers based on a micro-resonator for ultra-low noise microwave generation

Laiyang Dang, Dongmei Huang, Chao Wang, Yujia Li, Feng Li

Author Affiliations +

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 1310437 (2024) https://doi.org/10.1117/12.3023345
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

A novel scheme for generating ultra-narrow linewidth and ultra-low noise photonic microwave based on simultaneous self-injection locking of dual DFB lasers is proposed and demonstrated. Herein, two narrow linewidth DFB lasers can be independently achieved by Rayleigh backscattering excited in a micro-resonator as feedback for self-injection locking. The 3-dB linewidth of the DFB laser is compressed from 320 kHz to 1.5 kHz, which is narrowed by 2 orders of magnitude. Based on dual narrow linewidth lasers locked to the same micro-resonator, an all-optical high-performance photonic microwave signal is generated by using the optical heterodyne method. The photonic microwave signal with the single sideband phase noise of −102 dBc/Hz and frequency noise of 600 Hz²/Hz is obtained at a frequency offset of 1 MHz for the generated 5.42 GHz microwave. The proposed scheme is also applicable to any other type of lasers such as VCSEL, fiber lasers et al, which provides a new perspective for the generation of ultra-low noise microwave signals.

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

Citation Download Citation

Laiyang Dang, Dongmei Huang, Chao Wang, Yujia Li, and Feng Li "Self-injection locking dual-DFB lasers based on a micro-resonator for ultra-low noise microwave generation", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 1310437 (18 March 2024); https://doi.org/10.1117/12.3023345

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