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. 2020 Nov 17;11:5839. doi: 10.1038/s41467-020-19544-9

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© The Author(s) 2020

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. 5 — a Receiver sensitivity, i.e., required average power at the output of the detection system to ensure a bit error rate (BER) <10⁻⁷, measured for each of the 64 channels (at 10 Gbit/s) of the 640 Gbit/s OTDM input (blue) and output (red) signals. b, c Eye diagrams (overlapping the temporal signals over eight consecutive bit time periods) of the 640 Gbit/s coherent digital b input data signal and c the inverted output data signal.