In multi-subcarrier wavelength-division-multiplexed (WDM) systems, spectrally close subcarriers are influenced by nonlinearity in a similar way. This causes the nonlinear interference noise (NLIN) that affects them to be correlated — a fact that can be exploited for nonlinearity mitigation. Focusing on the effect of nonlinearity-induced phase noise (NLPN), we find the auto-correlation and cross-correlation functions of the NLPN influencing different subcarriers, and propose a mitigation algorithm that takes advantage of these correlations so as to improve the overall system performance. We validate our results numerically and experimentally.

中文翻译：

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多副载波系统中的相关非线性相位噪声：建模和缓解

在多子载波波分复用 (WDM) 系统中，频谱接近的子载波以类似的方式受到非线性的影响。这会导致影响它们的非线性干扰噪声 (NLIN) 相关联——这一事实可用于缓解非线性。针对非线性引起的相位噪声 (NLPN) 的影响，我们找到了 NLPN 影响不同子载波的自相关和互相关函数，并提出了一种利用这些相关性的缓解算法，以改善整个系统表现。我们通过数值和实验验证了我们的结果。