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. 2021 Aug 20;12:5076. doi: 10.1038/s41467-021-25374-0

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© The Author(s) 2021

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. 4 — a Measurement setup for the balanced detection. AWG: arbitrary waveform generator, TL: tunable laser, EDFA: erbium-doped fiber amplifier, PC: polarization controller, ATT: optical attenuator, EA: electric amplifier, RTO: real-time oscilloscope. b, f The real signal waveforms of 50 Gbit/s (b) and 90 Gbit/s (f) BPSK signals (blue line stands for I + branch and red line stands for I− branch). c–e Eye diagrams of I + branch (c), I− branch (d), and balanced detection (e) for 50 Gbit/s BPSK signal. g–i Eye diagrams of I + branch (g), I− branch (h), and balanced detection (i) for 90 Gbit/s BPSK signal.