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. 2017 Feb 24;6(2):e16207. doi: 10.1038/lsa.2016.207

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

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Algorithm of PPDM-4 DPSK signal demultiplexing; (a) illustrates main modules of signal demultiplexing algorithm. (b, c) The theoretical SOP of multiplexed signal before and after polarization tracking, respectively. The polarization principal axis of CR1 is aligned to S1 direction. (d, e) The phase constellation before and after polarization tracking. (f) The phase constellation after linewidth compensation. (g) The phase density diagram for determining the decision thresholds.