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考虑信号频谱展宽效应的高容量光通信系统中的数字非线性补偿

Digital nonlinearity compensation in high-capacity optical communication systems considering signal spectral broadening effect.

作者信息

Xu Tianhua, Karanov Boris, Shevchenko Nikita A, Lavery Domaniç, Liga Gabriele, Killey Robert I, Bayvel Polina

机构信息

School of Engineering, University of Warwick, Coventry, CV4 7AL, United Kingdom.

Optical Networks Group, Department of Electronic & Electrical Engineering, University College London, London, WC1E 7JE, United Kingdom.

出版信息

Sci Rep. 2017 Oct 11;7(1):12986. doi: 10.1038/s41598-017-12614-x.

DOI:10.1038/s41598-017-12614-x
PMID:29021614
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5636832/
Abstract

Nyquist-spaced transmission and digital signal processing have proved effective in maximising the spectral efficiency and reach of optical communication systems. In these systems, Kerr nonlinearity determines the performance limits, and leads to spectral broadening of the signals propagating in the fibre. Although digital nonlinearity compensation was validated to be promising for mitigating Kerr nonlinearities, the impact of spectral broadening on nonlinearity compensation has never been quantified. In this paper, the performance of multi-channel digital back-propagation (MC-DBP) for compensating fibre nonlinearities in Nyquist-spaced optical communication systems is investigated, when the effect of signal spectral broadening is considered. It is found that accounting for the spectral broadening effect is crucial for achieving the best performance of DBP in both single-channel and multi-channel communication systems, independent of modulation formats used. For multi-channel systems, the degradation of DBP performance due to neglecting the spectral broadening effect in the compensation is more significant for outer channels. Our work also quantified the minimum bandwidths of optical receivers and signal processing devices to ensure the optimal compensation of deterministic nonlinear distortions.

摘要

奈奎斯特间隔传输和数字信号处理已被证明在最大化光通信系统的频谱效率和传输距离方面是有效的。在这些系统中，克尔非线性决定了性能极限，并导致在光纤中传播的信号出现频谱展宽。尽管数字非线性补偿已被证实对于减轻克尔非线性很有前景，但频谱展宽对非线性补偿的影响从未被量化。本文研究了在考虑信号频谱展宽效应的情况下，奈奎斯特间隔光通信系统中用于补偿光纤非线性的多通道数字反向传播（MC-DBP）的性能。研究发现，考虑频谱展宽效应对于在单通道和多通道通信系统中实现DBP的最佳性能至关重要，与所使用的调制格式无关。对于多通道系统，在补偿中忽略频谱展宽效应导致的DBP性能下降对外围通道更为显著。我们的工作还量化了光接收器和信号处理设备的最小带宽，以确保对确定性非线性失真的最佳补偿。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/47b97401c896/41598_2017_12614_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/2fd533756ef8/41598_2017_12614_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/99cde0e188e7/41598_2017_12614_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/517cee1fa753/41598_2017_12614_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/b0a52c6748a8/41598_2017_12614_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/a6adcc9bcc4d/41598_2017_12614_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/0c4196ae3f26/41598_2017_12614_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/8b79ec2208c0/41598_2017_12614_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/47b97401c896/41598_2017_12614_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/2fd533756ef8/41598_2017_12614_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/99cde0e188e7/41598_2017_12614_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/517cee1fa753/41598_2017_12614_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/b0a52c6748a8/41598_2017_12614_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/a6adcc9bcc4d/41598_2017_12614_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/0c4196ae3f26/41598_2017_12614_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/8b79ec2208c0/41598_2017_12614_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8398/5636832/47b97401c896/41598_2017_12614_Fig8_HTML.jpg

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