Multi-Level, Multi-Dimensional Coding for High-Speed and High-Spectral-Efficiency Optical Transmission
Multi-Level, Multi-Dimensional Coding for High-Speed and High-Spectral-Efficiency Optical Transmission
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DOI：
10.1109/jlt.2009.2022765
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发表时间：
2009-05
影响因子：
4.7
通讯作者：
Xiang Zhou;Jianjun Yu
中科院分区：
文献类型：
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作者：
Xiang Zhou;Jianjun Yu
我们回顾并研究了最近展示的几种基于单载波的多级和多维编码 (ML-MDC) 技术，这些技术可实现频谱效率高的 100 Gb/s 传输。其中包括 16 进制 PDM-QPSK、64 进制 PDM-8PSK、64 进制 PDM-8QAM 以及 256 进制 PDM-16 QAM。我们证明，高速 QPSK、8PSK、8QAM 和 16QAM 都可以通过新颖的合成方法，使用商用光调制器仅使用二进制电驱动信号来生成，并且所有这些调制格式都可以使用通用接收器前端和数字相干检测来检测。我们表明，恒模算法 (CMA) 对于 PDM-QPSK 和 PDM-8PSK 信号的盲偏振恢复非常有效，但对于 PDM-8QAM 和 PDM-16 QAM 的效果较差。然后，我们针对这些情况提出了最近提出的级联多模算法。除了用于星座恢复的 DSP 算法之外，我们还描述了一种 DSP 算法，用于提高使用单端光电检测的相干接收器的性能。研究了 ASE 噪声、激光相位噪声、窄带光学滤波和光纤非线性效应对系统的影响。对于使用全接收端数字补偿的高级调制格式，表明对本振相位噪声的要求比信号激光器更严格。我们还表明，RZ 脉冲整形显着提高了滤波器和光纤非线性容限。最后，我们提出了三个实施这些 ML-MDC 技术的高频谱效率和高速 DWDM 传输实验。
We review and study several single carrier based multi-level and multi-dimensional coding (ML-MDC) technologies recently demonstrated for spectrally-efficient 100-Gb/s transmission. These include 16-ary PDM-QPSK, 64-ary PDM-8PSK, 64-ary PDM-8QAM as well as 256-ary PDM-16 QAM. We show that high-speed QPSK, 8PSK, 8QAM, and 16QAM can all be generated using commercially available optical modulators using only binary electrical drive signals through novel synthesis methods, and that all of these modulation formats can be detected using a universal receiver front-end and digital coherent detection. We show that the constant modulus algorithm (CMA), which is highly effective for blind polarization recovery of PDM-QPSK and PDM-8PSK signals, is much less effective for PDM-8QAM and PDM-16 QAM. We then present a recently proposed, cascaded multi-modulus algorithm for these cases. In addition to the DSP algorithms used for constellation recovery, we also describe a DSP algorithm to improve the performance of a coherent receiver using single-ended photo-detection. The system impact of ASE noise, laser phase noise, narrowband optical filtering and fiber nonlinear effects has been investigated. For high-level modulation formats using full receiver-side digital compensation, it is shown that the requirement on LO phase noise is more stringent than the signal laser. We also show that RZ pulse shaping significantly improves filter- and fiber-nonlinear tolerance. Finally we present three high-spectral-efficiency and high-speed DWDM transmission experiments implementing these ML-MDC technologies.