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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. 3 — The 14.09-GHz DKS f_rep is generated by photodetection of the soliton train. The synthesized signals at 7.05 (f_rep/2) and 4.70 GHz (f_rep/3) are output by the frequency-modulated signal generator when the SPL is activated. The servo has a control bandwidth of ∼10 kHz, causing the rising noise level around that frequency. Within the control bandwidth, the noise levels of the two synthesized microwaves are lower than that of f_rep by 6 and 9.5 dB (the dashed lines with a slope of f⁻² are plotted for visual guidance). At frequencies above 100 kHz, the phase noise of the synthesized microwaves are identical to the levels intrinsic to the free running signal generator because of the servo’s limited bandwidth. The inset shows a photograph of the MgF₂ resonator. Photo credit: Tobias Herr, EPFL.