建模方法对光纤传输系统中考虑联合PMD和Kerr效应的非线性噪声统计估计的影响
Influence of Modeling Methods on the Estimation of the Nonlinear Noise Statistics Considering Joint PMD and Kerr Effects in Fiber Transmission Systems
摘要：
在当前的软件定义光网络中，快速准确地估计传输链路的传输质量（QoT）是必不可少的。高斯噪声模型，以产生一个快速估计的平均QoT来自确定性的系统参数，但不捕捉QoT的变化。为了对偏振模色散（PMD）和克尔非线性的随机联合效应进行数值分析，系统设计者通常采用基于Manakov-PMD方程的分步傅里叶方法（SSFM），该方法忽略了非线性PMD项，比耦合非线性薛定谔方程（CNLSE）更快，并且对于双折射相关长度较短（约小于10 m）的光纤具有足够的精度。在这项工作中，我们提出的见解的方式来调整这个Manakov-PMD方法的参数和它的局限性时，寻求一个准确的估计的非线性干扰（NLI）噪声的统计分布可能安装在当前的光网络中的所有光纤。特别是，我们比较这Manakov-PMD方法的结果与CNLSE得到的，而不同的光纤双折射相关长度，PMD系数和光纤类型。我们的研究结果突出了一个潜在的差异0.5 dB的Q^2因子的估计在一个跨度偏振分复用正交相移键控（PDM-QPSK）传输与最佳发射功率每信道和产量的指导方针，以选择最合适的数值估计方法。
英文摘要：
In the recent context of Software Defined Optical Network, the fast and accurate Quality of Transmission (QoT) estimation of the transmission link is essential. Gaussian Noise models are shown to yield a fast estimation of the average QoT derived from deterministic system parameters, but do not capture the QoT variability. In order to assess numerically the stochastic joint effect of Polarization Mode Dispersion (PMD) and Kerr nonlinearities, system designers generally use the Split Step Fourier Method (SSFM) based on Manakov-PMD equation neglecting the nonlinear-PMD term which is faster than using Coupled NonLinear Schrodinger Equation (CNLSE) and enough accurate for fiber with short birefringence correlation length (around less than 10m). In this work, we present insights of the way to tune the parameters of this Manakov-PMD method and its limitation when seeking an accurate estimation of the Non-Linear Interference (NLI) noise statistical distribution for all fibers potentially installed in the current optical network. In particular we compare this Manakov-PMD method results with respect to the one obtained by CNLSE while varying the fiber birefringence correlation length, PMD coefficient and the fiber type. Our results highlight a potential discrepancy of 0.5 dB in the estimation of the Q^2 factor in one span Polarization Division Multiplexed Quadrature Phase Shift Keying (PDM-QPSK) transmission with optimal launch power per channel and yield guidelines to choose the most suitable numerical estimation method.
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