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. 2021 Nov 18;12:6716. doi: 10.1038/s41467-021-26740-8

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Schematic diagram of beating frequency generation. b Beat note of the Stokes combs in the U band. The Stokes solitons share the same repetition rate but have different frequency offsets. Here we select three beat notes f_A (7.514 MHz), f_B (115.12 MHz), and f_C (338.37 MHz). All of them show narrow linewidth and high signal to noise ratio. c Single-sideband phase noise of f_A, f_B, and f_C, down to −140 dBc/Hz.