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. 2020 Sep 25;6(39):eaba2807. doi: 10.1126/sciadv.aba2807

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 4 — (A) From top to bottom: the optical spectra of the amplified soliton microcomb and the GSL with gain switching rates of f_rep/6, f_rep/10, and f_rep/15, respectively. (B) The enlargement of the comb spectra from 1546 to 1550 nm. (C) The phase noise spectra of the synthesized microwave signals. The blue dotted trace is the phase noise level of the 100-GHz f_rep inferred from the measured phase noise levels of the synthesized signals. The trace is not plotted above 30 kHz because of the limited control bandwidth of the SPL servo. The inset is a photograph of the Si₃N₄ microresonator.