线性调频z变换在光采样光性能监测中的应用  

Application of Chirp-z Transform to the Optical-SamplingOptical Performance Monitoring

作　　者：赖俊森[1] 杨爱英[1] 孙雨南[1] 

机构地区：[1]北京理工大学光电学院,北京100081

出　　处：《北京理工大学学报》2011年第7期833-837,854,共6页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(60978007)

摘　　要：研究采用异步降频光采样技术进行光性能监测的方法,通过软件同步算法对采样信号进行眼图重构和Q值监测.在软件同步算法中使用线性调频z变换(CZT)对离散傅里叶变换频谱进行局部细化,提高频谱分辨率,获取准确的眼图重构时间参数.仿真实验表明,CZT算法能够准确重构被监测光信号的眼图并测量Q值,在算法精度和稳定度方面都优于目前已有算法,且计算时间进一步降低40%.该方法快速、准确,能够很好地应用于光采样光性能监测系统.The software synchronization algorithm in asynchronous optical-sampling optical performance monitoring is researched for the purpose of eye diagram reconstruction and Q value monitoring. Using chirp-z transform （CZT） to zoom local discrete Fourier transform spectrum, the spectral resolution can be improved and the sampling step size can be derived accurately. Simulation experiments show that the CZT based software synchronization algorithm is a precise way to reconstruct eye diagram and to calculate Q value. The algorithm has higher accuracy and robustness than current algorithms. The required operation time is also reduced by 40;. This scheme is featured by high speed and accuracy, and has promising application in optical-sampling optical performance monitoring systems.

关 键 词：线性调频Z变换 眼图重构 Q值 光性能监测 

分 类 号：TN929.11[电子电信—通信与信息系统]