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5 February 2013 Complexity-reduced digital nonlinear compensation for coherent optical system
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The high complexity of conventional intra-channel nonlinearity compensation algorithms, such as back-propagation, is considered as the major obstacle for the implementation. To reduce the complexity, perturbation analysis is applied because it considers multi-span transmission as one stage. In those perturbation based algorithms, such as perturbation back-propagation (PBP) and perturbation pre-distortion, the number of required compensation stage is much less than that of conventional back-propagation. To reduce the complexity further, the multi-tap finite impulse response filter (FIR) in PBP is replaced with one-tap infinite impulse response (IIR) filter. The number of required compensation stage of IIR PBP is only 15% of conventional back-propagation, whereas the complexity of each stage is almost same. In perturbation pre-distortion, the proposed perturbation combination reduces the number of terms from 19732 to 41, whereas no performance degradation is observed.
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Zhenning Tao, Liang Dou, Weizhen Yan, Yangyang Fan, Lei Li, Shoichiro Oda, Yuichi Akiyama, Hisao Nakashima, Takeshi Hoshida, and Jens C. Rasmussen "Complexity-reduced digital nonlinear compensation for coherent optical system", Proc. SPIE 8647, Next-Generation Optical Communication: Components, Sub-Systems, and Systems II, 86470K (5 February 2013);

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