Abstract We propose a cross-phase modulation (XPM) mitigation method in wavelength division multiplexing (WDM) systems, which is enabled by the split nonlinearity compensation (NLC) and the modified decision directed recursive least square (DD-RLS) based nonlinear phase noise (NLPN) tracking algorithm. In the proposed method, the split NLC reduces the interaction between the dispersion and the XPM and makes the impact of the XPM on the signal more tend to the NLPN. Combined with the proposed modified DD-RLS algorithm, which can effectively track the fast-changing NLPN, the XPM effect in WDM systems can be mitigated. The proposed method is demonstrated by a WDM transmission simulation with 11 channels. The simulation results show that the proposed modified DD-RLS algorithm has better NLPN tracking ability and noise tolerance than the normal DD-RLS algorithm, and together with the split NLC, 0.8 dB Q2-factor improvement can be seen in the 1000-km transmission.

中文翻译：

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通过拆分 NLC 和基于修改的 DD-RLS 的 NLPN 跟踪启用 WDM 系统中的 XPM 缓解

摘要 我们在波分复用 (WDM) 系统中提出了一种交叉相位调制 (XPM) 缓解方法，该方法通过分裂非线性补偿 (NLC) 和基于改进的决策定向递归最小二乘 (DD-RLS) 的非线性相位噪声实现。 (NLPN) 跟踪算法。在所提出的方法中，分裂 NLC 减少了色散和 XPM 之间的相互作用，并使 XPM 对信号的影响更倾向于 NLPN。结合所提出的改进的DD-RLS算法，可以有效地跟踪快速变化的NLPN，可以减轻WDM系统中的XPM效应。所提出的方法通过具有 11 个信道的 WDM 传输仿真来证明。