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. 2020 Jul 23;11:3694. doi: 10.1038/s41467-020-17516-7

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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. 6 — a Q-factor vs. signal-launched power for CD compensation only, DBP, and DNN-based DBP with different computational complexities. (b) Optimized amplitude spectra of linear operators at different stages of 1-step-per-span (StPS) DNN-based DBP at 2.2-dBm signal-launched power. The spectra are vertically shifted from each other for visual clarity, and the signal spectrum is also shown. c Optimized phase response of linear operators at different DNN-based DBP stages at −1.4-dBm signal-launched power. d Optimized ξ_k at different DNN-based DBP stages at −1.4-dBm signal-launched power. While the optimized phase responses are close to quadratic that resembles CD compensation, the amplitude spectra are “M”-shaped. The optimized ξ_k is not the same for each step, and exhibits a “U”-shaped structure. Source data are provided as a Source Data file.