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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).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 1 — (A) The conceptual illustration of the scheme. The VCO is controlled by the SPL servo, outputting microwave frequency that is a subharmonic of the soliton repetition rate. (B) A photograph of the DFB laser used in this work. (C) Illustration of the gain-switched comb when the SPL is off. Multiple frequencies caused by the beating between sidebands of different microcomb teeth are generated. (D) The output of a soliton-injected GSL (with the SPL off) measured by an optical sampling oscilloscope. a.u., arbitrary units. (E) Illustration of the subharmonic phase–locked scenario in the frequency domain. (F) Output of the GSL in the time domain when it is subharmonic phase–locked to the soliton repetition rate (14.09 GHz). Photo credit: Wenle Weng, EPFL.