Low-phase-noise microwave generation with a free-running dual-pumped Si<sub>3</sub>N<sub>4</sub> soliton microcomb

Rongwei Liu; Chenbo Zhang; Yankun Li; Xinglong Li; Jingjing Lin; Bibo He; Zhangyuan Chen; Xiaopeng Xie

doi:10.1364/OL.511039

Optics Letters
Vol. 49,
Issue 3,
pp. 754-757
(2024)
•https://doi.org/10.1364/OL.511039

Low-phase-noise microwave generation with a free-running dual-pumped Si₃N₄ soliton microcomb

Rongwei Liu, Chenbo Zhang, Yankun Li, Xinglong Li, Jingjing Lin, Bibo He, Zhangyuan Chen, and Xiaopeng Xie

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Rongwei Liu, Chenbo Zhang, Yankun Li, Xinglong Li, Jingjing Lin, Bibo He, Zhangyuan Chen, and Xiaopeng Xie, "Low-phase-noise microwave generation with a free-running dual-pumped Si₃N₄ soliton microcomb," Opt. Lett. 49, 754-757 (2024)

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Abstract

Microwave signals can be generated by photodetecting the repetition frequencies of the soliton microcombs. In comparison to other methods, the dual-pumped method allows for the stable generation of the soliton microcombs even with resonators having lower Q-factors. However, introducing an additional pump laser may affect the phase noise of the generated microwave signals when using these dual-pumped soliton microcombs. Here, we investigate the factors that could influence the phase noise of microwave signals generated with dual-pumped soliton microcombs, including the polarization, amplitude noise, and phase noise of the two pumps. We demonstrate a 25.25 (12.63) GHz microwave with phase noise reaching −112(−118) dBc/Hz at a 10 kHz offset frequency, surpassing the performance of previous reports on microwave generation using free-running Si₃N₄ soliton microcombs, even those generated with higher Q microresonators. We analyze the noise floor of the generated microwave signals and establish a phase noise simulation model to study the limiting factors in our system. Our work highlights the potential of generating low-phase-noise microwave signals using free-running dual-pumped soliton microcombs.

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