Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom.
1] Optical Networks Group, University College London, Torrington Place, London WC1E 7JE, United Kingdom [2] NEC Corporation, Abiko, Japan.
Sci Rep. 2015 Feb 3;5:8214. doi: 10.1038/srep08214.
The achievable transmission capacity of conventional optical fibre communication systems is limited by nonlinear distortions due to the Kerr effect and the difficulty in modulating the optical field to effectively use the available fibre bandwidth. In order to achieve a high information spectral density (ISD), while simultaneously maintaining transmission reach, multi-channel fibre nonlinearity compensation and spectrally efficient data encoding must be utilised. In this work, we use a single coherent super-receiver to simultaneously receive a DP-16QAM super-channel, consisting of seven spectrally shaped 10GBd sub-carriers spaced at the Nyquist frequency. Effective nonlinearity mitigation is achieved using multi-channel digital back-propagation (MC-DBP) and this technique is combined with an optimised forward error correction implementation to demonstrate a record gain in transmission reach of 85%; increasing the maximum transmission distance from 3190 km to 5890 km, with an ISD of 6.60 b/s/Hz. In addition, this report outlines for the first time, the sensitivity of MC-DBP gain to linear transmission line impairments and defines a trade-off between performance and complexity.
传统光纤通信系统的传输容量是有限的，这是由于克尔效应引起的非线性失真以及难以调制光场以有效利用可用光纤带宽所致。为了实现高信息谱密度（ISD），同时保持传输距离，必须利用多通道光纤非线性补偿和光谱高效数据编码。在这项工作中，我们使用单个相干超接收器同时接收一个 DP-16QAM 超通道，该超通道由七个在奈奎斯特频率处间隔的光谱成形 10GBd 子载波组成。使用多通道数字后向传播（MC-DBP）实现有效的非线性缓解，并且该技术与优化的前向纠错实现相结合，以证明传输距离的创纪录增益为 85%；将最大传输距离从 3190km 增加到 5890km，ISD 为 6.60b/s/Hz。此外，本报告首次概述了 MC-DBP 增益对线性传输线损伤的敏感性，并定义了性能和复杂性之间的权衡。
