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A Discrete-Time Model for Uncompensated Single-Channel Fiber-Optical Links

机译：无补偿单通道光纤链路的离散模型

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摘要

An analytical discrete-time model is introduced for single-wavelength polarization multiplexed nonlinear fiber-optical channels based on the symmetrized split-step Fourier method (SSFM). According to this model, for high enough symbol rates, a fiber-optic link can be described as a linear dispersive channel with additive white Gaussian noise (AWGN) and a complex scaling. The variance of this AWGN noise and the attenuation are computed analytically as a function of input power and channel parameters. The results illustrate a cubic growth of the noise variance with input power. Moreover, the cross effect between the two polarizations and the interaction of amplifier noise and the transmitted signal due to the nonlinear Kerr effect are described. In particular, it is found that the channel noise variance in one polarization is affected twice as much by the transmitted power in that polarization than by the transmitted power in the orthogonal polarization. The effect of pulse shaping is also investigated through numerical simulations. Finally, it is shown that the analytical performance results based on the new model are in close agreement with numerical results obtained using the SSFM for a symbol rate of 28 Gbaud and above.
机译：基于对称分步傅里叶方法（SSFM），引入了单波长偏振复用非线性光纤信道的解析离散时间模型。根据此模型，对于足够高的符号率，可以将光纤链路描述为具有加性高斯白噪声（AWGN）和复杂缩放的线性色散信道。该AWGN噪声和衰减的方差是根据输入功率和信道参数进行分析计算的。结果表明，噪声方差随输入功率的三次方增长。此外，还描述了两个极化之间的交叉效应以及由于非线性克尔效应而引起的放大器噪声与发射信号之间的相互作用。特别地，发现在一个极化中的信道噪声方差受该极化中的发射功率的影响是正交极化中的发射功率的两倍。还通过数值模拟研究了脉冲整形的影响。最后，表明基于新模型的分析性能结果与使用SSFM在28 Gbaud及更高符号速率下获得的数值结果非常吻合。

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