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. 2017 Jun 12;8:15825. doi: 10.1038/ncomms15825

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Copyright © 2017, The Author(s)

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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(a) Emitted spectral linewidth depending on the magnitude of the DC current injected in the oscillator STO 1 (I_DC,2 is fixed to +10.6 mA for STO 2). (b) Phase noise power spectral density in the synchronized state (I_DC,2 is fixed to +10.6 mA and I_DC,1 is fixed to +11 mA) and in the non-interacting states. The characteristics of each STO when one is switched off are shown in green and orange softened curves).