激光与光电子学进展, 2018, 55 (3): 030604, 网络出版: 2018-09-10  

借助聚类分析的光发射机信号畸变评估方法 下载: 1106次

Optical Transmitter Signal Distortion Evaluation Based on Cluster Analysis
作者单位
哈尔滨工业大学深圳研究生院电子与信息工程学院, 广东 深圳 518000
摘要
面向光发射机信号畸变分析的应用场景,采取了一种相位近似缓变的相干检测系统,并借助聚类分析算法对畸变光信号进行分析预处理,精确估计畸变系数并实现较好的星座图恢复效果。该系统通过调整本振光传输链路长度使其与信号光传输链路的长度基本相等,本振光和信号光之间的相位差在较长的时间窗口内近似恒定,从而允许借助聚类分析方法对长时间窗口数据进行星座图的智能分析与预处理,基于聚类中心点位置计算获得畸变系数,同时以聚类中心位置作为参考进行后续均衡和载波相位处理。该方案解决了在信号畸变与相位噪声同时存在下的信号恢复难题,可实现精准信号畸变评估。在实验系统中使用聚类分析方法和盲相位搜索(BPS)算法对I-Q增益不平衡、I-Q幅度分布不均匀和I-Q相位误差三种发射机畸变信号进行处理,并进行相应的实验验证。仿真和实验结果均表明,该实验系统中聚类算法可对发射机的上述三种畸变损伤实现精确估计。
Abstract
Aim

ing at the application of optical transmitter signal distortion analysis, we adopt a coherent detection system with slowly varying phase, analyze the preprocessing of the distorted optical signal by means of cluster analysis, and estimate the distortion coefficients accurately to achieve a better constellation restoration effect. In this system, we adjust the length of the local oscillator fiber link to be equal to the fiber length of the signal link, so that the phase difference between the local oscillator and the signal light can be approximately constant over a long time window. It means that we can do intelligent analysis and preprocessing of the constellation for the long time window data by means of cluster analysis. Then, we obtain the distortion coefficients and cluster centroids based on cluster analysis of signal constellation, and use the location information of cluster centroids to equalization process and carrier phase recovery. This scheme solves signal recovery problems in the presence of signal distortion and phase noise, enabling accurate signal distortion evaluation. In this system, we simulate and experiment three kinds of distorted signals (I-Q gain imbalance, I-Q phase error, and I-Q amplitude uneven distribution) by using cluster analysis and blind-phase-search (BPS) algorithm. The results show that in the experimental system we can accurately estimate the transmitter signal distortion mentioned by using cluster analysis.

周钟青, 杨彦甫, 张群, 何倩雯, 向前, 曹军涛. 借助聚类分析的光发射机信号畸变评估方法[J]. 激光与光电子学进展, 2018, 55(3): 030604. Zhongqing Zhou, Yanfu Yang, Qun Zhang, Qianwen He, Qian Xiang, Juntao Cao. Optical Transmitter Signal Distortion Evaluation Based on Cluster Analysis[J]. Laser & Optoelectronics Progress, 2018, 55(3): 030604.

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