Zhu Likai, Li Guifang
CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA.
Opt Express. 2011 Mar 28;19(7):5953-9. doi: 10.1364/OE.19.005953.
In periodically dispersion managed long-haul transmission systems, waveform distortion is dominated by chromatic dispersion. As a result of the periodic waveform evolution, the nonlinear behavior also repeats itself in every dispersion period. It is shown that, under the weakly nonlinear assumption, nonlinear effects accumulated in a large number (K) of spans can be approximated by nonlinear effects accumulated in a single span with the same dispersion map and K times the nonlinearity. Thus, significant savings in computational load can be achieved in digital compensation of fiber nonlinearity using folded digital backward propagation (DBP). Simulation results show that the required computation for DBP of dispersion managed transoceanic transmission systems can be reduced by up to 2 orders of magnitude with negligible penalty using folded DBP.
在周期性色散管理的长途传输系统中，波形失真主要由色散主导。由于波形的周期性演变，非线性行为也会在每个色散周期中重复出现。结果表明，在弱非线性假设下，大量（K）跨度中累积的非线性效应可以由具有相同色散图且非线性为K倍的单个跨度中累积的非线性效应来近似。因此，使用折叠数字反向传播（DBP）进行光纤非线性的数字补偿时，可以显著节省计算量。仿真结果表明，使用折叠DBP，色散管理的跨洋传输系统的DBP所需计算量最多可减少两个数量级，而代价可忽略不计。
