基于大角度间隔反拉东变换的色散监测方案  

Chromatic Dispersion Monitoring Scheme Based on Inverse Radon Transform with Large Angle Intervals

作　　者：陆肖宇 杨慧[1] 罗海洋 易安林[1] 闫连山[1] Lu Xiaoyu;Yang Hui;Luo Haiyang;Yi Anlin;Yan Lianshan(School of Information Science and Technology,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)

机构地区：[1]西南交通大学信息科学与技术学院,四川成都610031

出　　处：《光学学报》2024年第22期18-26,共9页Acta Optica Sinica

基　　金：国家重点研发计划(2023YFB2905401);国家自然科学基金面上项目(62271422)。

摘　　要：针对基于相干接收的光通信网络中色散监测精度问题,研究探讨基于分数傅里叶变换和卷积神经网络的色散监测方案,提出一种大角度间隔反拉东变换的色散监测特征。该特征能够突出显示时频图中的峰值位置,显著增强时频图峰值微小变化的表达,以获得高精度的色散特征描述。仿真结果表明:在搭建的28 GBaud偏振复用16阶正交幅度调制相干通信系统中,所提出的色散监测方案平均绝对误差仅为19.82 ps/nm,色散监测范围为1600~24000 ps/nm,轻量化神经网络训练参数仅为15960个,为高精度、低复杂度的色散监测提供新思路。Objective Optical performance monitoring is crucial for enhancing the reliability and intelligence of optical communication networks.Chromatic dispersion(CD)monitoring is essential for adaptive,precise dispersion and nonlinear compensation in dynamic optical networks,where even small errors can significantly affect receiver performance.Traditional CD monitoring methods,which typically rely on clock phase information,autocorrelation functions,signal peak-to-average ratios,and signal amplitude and phase information,operate primarily in the time or frequency domains.However,these approaches often overlook information in joint time-frequency domain distributions and are generally limited to a monitoring range within 1000 km.The fractional Fourier transform(FrFT),an extension of the traditional Fourier transform,provides flexible analysis and extraction of time-frequency domain features by adjusting the transform order.While FrFT-based schemes can improve the range of dispersion monitoring,they typically suffer from monitoring errors above 100 ps/nm.In this study,we propose a chromatic dispersion monitoring scheme that uses an inverse Radon(iRadon)transform with large angular intervals to improve accuracy.Our approach effectively reduces noise interference and enhances subtle variations in time-frequency maps,increasing sensitivity to dispersion changes and reducing the complexity of network parameters.Methods We introduce a training sequence processed by FrFT into the transmitted signal for dispersion monitoring.This sequence can be generated by applying a fixed-angle FrFT to the DC signal.At the receiver,the received signal is downsampled,and the training sequence is processed through FrFT to obtain a two-dimensional time-frequency map.A cubic operation is then performed on this map to emphasize the energy peak position and mitigate the influence of nearby linear components.The iRadon transform is then applied to convert the two-dimensional time-frequency map from polar to Cartesian coordinates.Unlike traditional iR

关 键 词：光性能监测 色散监测 分数傅里叶变换 反拉东变换 

分 类 号：TN929.11[电子电信—通信与信息系统]