Communication using the optical fibre channel can be challenging due to nonlinear effects that arise in the optical propagation. These effects represent physical processes that originate from light propagation in optical fibres. To obtain fundamental understandings of these processes, mathematical models are typically used. These models are based on approximations of the nonlinear Schrödinger equation, the differential equation that governs the propagation in an optical fibre. All available models in the literature are restricted to certain regimes of operation. Here, we present an approximate model for the nonlinear optical fibre channel in the weak-dispersion regime, in a noiseless scenario. The approximation is obtained by applying regular perturbation theory on the group-velocity dispersion parameter of the nonlinear Schrödinger equation. The proposed model is compared with three other models using the normalized square deviation metric and shown to be significantly more accurate for links with high nonlinearities and weak dispersion.

中文翻译：

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非线性光纤通信中群速度色散参数的规则摄动。

由于光学传播中会出现非线性效应，因此使用光纤通道进行通信可能具有挑战性。这些效应代表了源自光在光纤中传播的物理过程。为了获得对这些过程的基本了解，通常使用数学模型。这些模型基于非线性Schrödinger方程的近似值，非线性Schrödinger方程控制着光纤中的传播。文献中所有可用的模型都限于某些操作方式。在这里，我们提出了在无噪声情况下弱色散状态下非线性光纤通道的近似模型。通过对非线性Schrödinger方程的群速度色散参数应用正则扰动理论来获得近似值。