Dispersive-wave induced noise limits in miniature soliton microwave sources

Qi-Fan Yang, Qing-Xin Ji, Lue Wu, Boqiang Shen, Heming Wang, Chengying Bao, Zhiquan Yuan and Kerry Vahala ()
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Qi-Fan Yang: California Institute of Technology
Qing-Xin Ji: California Institute of Technology
Lue Wu: California Institute of Technology
Boqiang Shen: California Institute of Technology
Heming Wang: California Institute of Technology
Chengying Bao: California Institute of Technology
Zhiquan Yuan: California Institute of Technology
Kerry Vahala: California Institute of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Compact, low-noise microwave sources are required throughout a wide range of application areas including frequency metrology, wireless-communications and airborne radar systems. And the photonic generation of microwaves using soliton microcombs offers a path towards integrated, low noise microwave signal sources. In these devices, a so called quiet-point of operation has been shown to reduce microwave frequency noise. Such operation decouples pump frequency noise from the soliton’s motion by balancing the Raman self-frequency shift with dispersive-wave recoil. Here, we explore the limit of this noise suppression approach and reveal a fundamental noise mechanism associated with fluctuations of the dispersive wave frequency. At the same time, pump noise reduction by as much as 36 dB is demonstrated. This fundamental noise mechanism is expected to impact microwave noise (and pulse timing jitter) whenever solitons radiate into dispersive waves belonging to different spatial mode families.

Date: 2021
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DOI: 10.1038/s41467-021-21658-7

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