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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Modeling inter-subcarrier four-wave mixing noises in QAM coherent OFDM system using phase-conjugated twin waves with diversity implement domains
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Modeling inter-subcarrier four-wave mixing noises in QAM coherent OFDM system using phase-conjugated twin waves with diversity implement domains

机译：使用相位缀合的双波与多样性实现域的QAM相干OFDM系统中QAM相干频道间四波混合噪声建模

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摘要

For coherent orthogonal frequency-division multiplexed (CO-OFDM) system, four-wave-mixing (FWM) noise is a major limiting factor. A scheme of phase-conjugated twin waves (PCTW) which co-propagates a signal with its phase-conjugated copy along optical fiber link, can be used to reduce the impact of FWM noise. Including walk-off between subcarriers, semi-analytic models of FWM noise are derived here for quadrature amplitude modulation (QAM) CO-OFDM system with three PCTW schemes implemented in time, subcarrier and polarization domains, respectively. We show that many phase-conjugated twin FWM components can be obtained in such system and they can be added destructively at the receiver, so the total FWM noise can be reduced, but some FWM components have not their phase-conjugated twins for the subcarrier-domain PCTW scheme. Some phase-conjugated twin FWM components are generated from different FWM collision processes for the time-domain PCTW scheme, as will reduce the effect of the PCTW scheme The calculative results obtained by using our semi-analytical model show that the polarization-domain PCTW scheme excels the other two schemes in improving the nonlinear tolerance of such system and the three PCTW schemes are all better than a partial carrier filling (PCF) technique.
机译：对于相干正交频分复用（CO-OFDM）系统，四波混合（FWM）噪声是主要限制因子。可以使用与沿着光纤链路的相位缀合的副本将信号共传播信号的相位缀合的双波（PCTW）的方案可用于降低FWM噪声的影响。包括子载波之间的步行，FWM噪声的半分析模型用于分别用于时间，子载波和偏振域的三个PCTW方案的正交幅度调制（QAM）Co-OFDM系统。我们表明，可以在这种系统中获得许多相位缀合的双FWM组件，并且可以在接收器处破坏性地加入，因此可以减少总FWM噪声，但是一些FWM组件没有它们的相位共轭双胞胎用于子载波 - 域PCTW方案。一些相位缀合的双FWM组件由用于时域PCTW方案的不同FWM碰撞过程产生，因为将降低PCTW方案的效果，通过使用我们的半分析模型获得的计算结果表明偏振域PCTW方案在提高这种系统的非线性公差方面求出另外两个方案，并且三个PCTW方案都优于部分载波填充（PCF）技术。

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