Liga Gabriele, Xu Tianhua, Alvarado Alex, Killey Robert I, Bayvel Polina
Opt Express. 2014 Dec 1;22(24):30053-62. doi: 10.1364/OE.22.030053.
The performance of digital backpropagation (DBP) equalization when applied over multiple channels to compensate for the nonlinear impairments in optical fiber transmission systems is investigated. The impact of a suboptimal multichannel DBP operation is evaluated, where implementation complexity is reduced by varying parameters such as the number of nonlinear steps per span and sampling rate. Results have been obtained for a reference system consisting of a 5×32 Gbaud PDM-16QAM superchannel with 33 GHz subchannel spacing and Nyquist pulse shaping under long-haul transmission. The reduction in the effectiveness of the algorithm is evaluated and compared with the ideal gain expected from the cancellation of the nonlinear signal distortion. The detrimental effects of polarization mode dispersion (PMD) with varying DBP bandwidth are also studied. Key parameters which ensure the effectiveness of multichannel DBP are identified.
研究了数字反向传播（DBP）均衡在多信道应用中用于补偿光纤传输系统非线性损伤时的性能。评估了次优多信道DBP操作的影响，其中通过改变诸如每跨段非线性步数和采样率等参数来降低实现复杂度。对于一个参考系统已获得结果，该系统由一个具有33 GHz子信道间隔和奈奎斯特脉冲整形的5×32 Gbaud偏振复用16正交幅度调制（PDM-16QAM）超信道组成，用于长距离传输。评估了算法有效性的降低，并与消除非线性信号失真所期望的理想增益进行了比较。还研究了不同DBP带宽下偏振模色散（PMD）的有害影响。确定了确保多信道DBP有效性的关键参数。
