Liu Xinyu, Wang Yongjun, Wang Xishuo, Tian Feng, Xin Xiangjun, Zhang Qi, Tian Qinghua, Yang Leijing
Appl Opt. 2019 Nov 20;58(33):9201-9207. doi: 10.1364/AO.58.009201.
A decision technique using mixture-of-Gaussian (MoG) clustering algorithms is proposed in the context of a coherent optical communication system. For an 80-Gb/s single-carrier polarization-division multiplexed 16 quadrature amplitude modulation (QAM) transmission system at 975 km, an improvement in $Q$Q factors up to 0.41 dB is observed for the entire range of the considered optical signal-to-noise SNR. Compared with the traditional minimum Euclidean distance-based decision, the MoG clustering-based decision achieves a transmission distance increase of 175 km at a $Q$Q factor of 9.96 dB. Experiment results show that the proposed decision technique is insensitive to the system's nonlinear impairments and can effectively improve nonlinear tolerance of the system. We also propose a majorization method for decision-directed least mean square (LMS) using the MoG clustering-based decision algorithm, called MoG-LMS. The performance improvement of the MoG-LMS algorithm is verified by experiments.
在相干光通信系统的背景下，提出了一种使用高斯混合（MoG）聚类算法的判决技术。对于一个975公里的80Gb/s单载波偏振复用16正交幅度调制（QAM）传输系统，在考虑的光信噪比（SNR）的整个范围内，观察到Q因子提高了0.41dB。与传统的基于最小欧几里得距离的判决相比，基于MoG聚类的判决在Q因子为9.96dB时实现了175公里的传输距离增加。实验结果表明，所提出的判决技术对系统的非线性损伤不敏感，并且可以有效地提高系统的非线性容限。我们还提出了一种使用基于MoG聚类的判决算法的判决导向最小均方（LMS）的优化方法，称为MoG-LMS。通过实验验证了MoG-LMS算法的性能提升。
