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arXiv 1909.08714eess.SP
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考虑克尔非线性和受激拉曼散射的非线性光纤传输模型的改进

An Improved Model of Nonlinear Fiber Propagation in the Presence of Kerr Nonlinearity and Stimulated Raman Scattering

Hami Rabbani, Gabriele Liga, Vinicius Oliari, Lotfollah Beygi, Erik Agrell, Magnus Karlsson, Alex Alvarado

备注：
Modifications for this version: i) Title; ii) Abstract; iii) Sec. I-C; iv) Table I; v) Example 1 removed; vi) Table II; vii) Fig. 2 removed; viii) Table III; ix) Eq. (27) changed; x) Eq. (28) changed; xi) Table IV; xii) Fig. 3 changed; xiii) New subsection added to the numerical results section; xiv) New Appendix (Appendix A) added to the paper.; xv) Some formulas in Appendix B were updated
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摘要：

超宽带光纤传输同时受到克尔非线性和受激拉曼散射的影响。存在解决克尔非线性和SRS之间相互作用的数学模型。这些模型是基于高斯噪声（GN）和增强型高斯噪声（EGN）模型。在本文中，我们提出了一个调制格式相关的模型，占增强的链路功能，这是有效的非相同的跨度，光纤跨度损耗和SRS增益/损耗不一定由放大器在每个跨度结束补偿。还介绍了一种新的信号功率分布，包括频率相关的光纤衰减。所提出的分析模型考虑了非线性干扰（NLI）的所有条款，包括自信道干扰，跨信道干扰和多信道干扰。它还表明，该模型具有预测的NLI功率具有更高的精度比以前的模型可以。分步傅立叶仿真表明，当SRS和任意调制格式都被考虑时，以前的模型可能不准确地预测NLI功率。对于具有10 Gbaud的1001个通道的10.011 THz系统，该差异可以高达4.3 dB。

英文摘要：

Ultra-wideband fiber optical transmission suffers from both Kerr nonlinearity and stimulated Raman scattering (SRS). Mathematical models that address the interplay between Kerr nonlinearity and SRS exist. These models are based on the Gaussian-noise (GN) and enhanced Gaussian noise (EGN) models. In this paper, we propose a modulation-format-dependent model, accounting for an enhanced link function, which is valid for non-identical spans where the fiber span loss and SRS gain/loss are not necessarily compensated for by the amplifier at the end of each span. A new signal power profile is also introduced, comprising the frequency-dependent fiber attenuation. The proposed analytical model takes all terms of nonlinear interference (NLI), including self-channel interference, cross-channel interference, and multi-channel interference, into account. It is also shown that the proposed model has the power to predict the NLI power with greater precision than the previous models can. Split-step Fourier simulations indicate that when both SRS and arbitrary modulation formats are considered, previous models may inaccurately predict the NLI power. This difference could be up to 4.3 dB for a 10.011 THz system with 1001 channels at 10 Gbaud.

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