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Accumulation of nonlinear interference noise in probabilistically shaped 64-quadrature amplitude modulation systems

机译：概率形状64正交幅度调制系统中非线性干扰噪声的累积

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摘要

An efficient procedure is presented for evaluating the effects of modulation format on the accumulation of nonlinear interference noise (NLIN) in probabilistically shaped 28 Gbaud 64-quadrature amplitude modulation (QAM) wavelength division multiplexed (WDM) systems. The shaped symbol sequences are generated by the rate adaptive scheme concatenating a constant composition distribution matcher and a systematic forward error correction encoder. A shaping distribution based on the Maxwell-Boltzmann and the uniform distribution with the same net bit rate is considered. The NLIN variance is emulated using the accurate enhanced modulation-dependent Gaussian noise model. Accounting for the impact of higher-order standardized moments of the modulation, the dependence of NLIN variance on probabilistic shaping is determined using the proposed procedure. In addition, an increase in NLIN variance for shaping over uniform input is demonstrated. For a dual polarization (DP) fully loaded C-band WDM optical fiber system with a channel spacing of 37.5 GHz, probabilistic shaping leads to a reduction of 0.036 in the ratio of intrachannel and interchannel contributions to nonlinear noise over uniform 64-QAM for a 1500-km distance. Finally, for nine channels with DP probabilistically shaped 64-QAM input over 1500-km transmission, distributed amplification enables a reduction of 2.54 dB in the accumulation of normalized NLIN power compared to lumped amplification. probabilistic shaping; nonlinear interference noise; modulation format; coherent optical fiber communications.
机译：提出了一种有效的程序，用于评估概率形状的28 Gbaud 64正交幅度调制（QAM）波分复用（WDM）系统中调制格式对非线性干扰噪声（NLIN）累积的影响。整形符号序列是通过速率自适应方案生成的，该速率自适应方案将常数组成分布匹配器和系统前向纠错编码器连接在一起。考虑基于Maxwell-Boltzmann的整形分布和具有相同净比特率的均匀分布。使用精确的增强型依赖于调制的高斯噪声模型来模拟NLIN方差。考虑到调制的高阶标准化矩的影响，使用提议的过程确定了NLIN方差对概率整形的依赖性。另外，证明了在均匀输入上进行整形的NLIN方差增加。对于信道间隔为37.5 GHz的双极化（DP）满载C波段WDM光纤系统，概率整形可导致在相同的64 QAM情况下，信道内和信道间对非线性噪声的贡献比降低0.036。 1500公里的距离。最后，对于九个具有1500 km传输的DP概率形状64-QAM输入的信道，与集总放大相比，分布式放大可将归一化NLIN功率的累积降低2.54 dB。概率整形非线性干扰噪声调制格式；相干光纤通信。

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  • 来源
    《Optical engineering》 |2019年第4期|046102.1-046102.6|共6页
  • 作者

    Linan Li; Qi Zhang; Xiangjun Xin; Yongjun Wang;

  • 作者单位

    Beijing University of Posts and Telecommunications, School of Electronic Engineering, State Key Laboratory of Information Photonics and Optical Communications, Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Haidian District, Beijing, China;

    Beijing University of Posts and Telecommunications, School of Electronic Engineering, State Key Laboratory of Information Photonics and Optical Communications, Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Haidian District, Beijing, China;

    Beijing University of Posts and Telecommunications, School of Electronic Engineering, State Key Laboratory of Information Photonics and Optical Communications, Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Haidian District, Beijing, China;

    Beijing University of Posts and Telecommunications, School of Electronic Engineering, State Key Laboratory of Information Photonics and Optical Communications, Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Haidian District, Beijing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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