Tanimura Takahito, Nölle Markus, Fischer Johannes Karl, Schubert Colja
Fraunhofer Institute for Telecommunications Heinrich Hertz Institute, Department of Photonic Networks and Systems, Einsteinufer 37, 10587 Berlin, Germany.
Opt Express. 2012 Dec 17;20(27):28779-85. doi: 10.1364/OE.20.028779.
We derive analytic formulas for the improvement in effective optical signal-to-noise ratio brought by a digital nonlinear compensator for dispersion uncompensated links. By assuming Gaussian distributed nonlinear noise, we are able to take both nonlinear signal-to-signal and nonlinear signal-to-noise interactions into account. In the limit of weak nonlinear signal-to-noise interactions, we derive an upper boundary of the OSNR improvement. This upper boundary only depends on fiber parameters as well as on the total bandwidth of the considered wavelength-division multiplexing (WDM) signal and the bandwidth available for back propagation. We discuss the dependency of the upper boundary on different fiber types and also the OSNR improvement in practical system conditions. Furthermore, the analytical formulas are validated by numerical simulations.
我们推导了用于色散未补偿链路的数字非线性补偿器所带来的有效光信噪比改善的解析公式。通过假设非线性噪声呈高斯分布，我们能够同时考虑非线性信号间和非线性信号与噪声间的相互作用。在弱非线性信号与噪声相互作用的极限情况下，我们推导出了光信噪比改善的上限。该上限仅取决于光纤参数以及所考虑的波分复用（WDM）信号的总带宽和可用于反向传播的带宽。我们讨论了上限对不同光纤类型的依赖性以及实际系统条件下的光信噪比改善情况。此外，通过数值模拟验证了解析公式。
