【作者】 李赟；

【导师】 席丽霞；

【作者基本信息】 北京邮电大学 ， 电子科学与技术， 2017， 硕士

【摘要】 随着5G及“互联网+”时代的到来,各种设备通过有线及无线方式接入互联网,数据业务的速率要求越来越大。而光通信系统具有传输容量大、传输距离远的特点,是解决高速率传输需求的最佳解决方案之一。目前光通信系统迅速发展,随着WDM、相干光通信等技术发展并应用于光纤通信系统中,单信道信息速率400Gbit/s,甚至1Tbit/s正逐步成为下一代商用系统的发展趋势。由于光纤通信系统的速率不断提高及光纤在骨干网、城域网及接入网的大规模使用,光纤中的色散、偏振模色散等特性正成为影响通信系统性能的关键因素。色散及偏振模色散测量具有重要意义。通过对色散及偏振模色散的测量,不仅能够对大量的出厂光纤进行质量检测,而且能够监测通信链路的质量,以便确定是否升级和维修线路。因此,色散和偏振模色散测试仪具有良好的市场前景。目前色散及偏振模色散测量方法较为成熟,但国内针对测试仪器及其测量方案的研究却很少,少有厂商涉足该仪器的设计和制造。针对色散及偏振模色散测量的现状及目前国内对低成本、高精度测量仪器的需求,对其测试仪器及其测量方案的研究尤为重要。本论文主要对单模光纤中色度色散及偏振模色散测试仪的测量方案进行了研究。主要做了以下几个方面的工作:(1)分析并比较目前测量方法的优缺点,为城域网环境下色散及偏振模色散测量方案提供参考。(2)针对城域网环境下色度色散的测量需求,提出了基于数字鉴相的色散测量测量方案,完成了基于OptiSystem和MATLAB的仿真平台搭建及其效果验证。仿真结果验证了测量方案的正确性及数字鉴相器的高精度;搭建了相应的实验系统,实验结果表明对于不同长度的G.652光纤,在波长1550nm处,累积色散测量精度小于10ps/nm,结果优于目前城域网环境下的商用色散测试仪的测量精度,且测量方法降低了测量成本。(3)针对城域网环境下偏振模色散的测量需求,对固定分析法进行改进,提出了基于粒子群优化算法的偏振模色散测量方案,搭建了相应的实验系统,偏振模色散值测量结果平均误差均小于0.2ps,且实现简单,测量结果可重复性高。基于粒子群优化的高斯曲线拟合算法不仅保证了测量精度,还提高了测量速度。更多还原

【Abstract】 With the arrival of the 5G and "Internet +" era, a variety of devices get access to internet by wired and wireless methods. The rate of data service is becoming more and more big. And optical communication system has great advantages of large transmission capacity and long transmission distance. So it becomes one of the best solutions to solve the problem of high rate transmission. At present, WDM and coherent optical communication technology are applied into optical fiber communication system.and they contribute a lot to the rapid development of optical communication system. What’s more, single channel information rate 400Gbit/s, even 1 Tbit/s has gradually become the development trend of commercial system of the next generation.Due to the large scale use of optical fiber in communication system and increasing rate of optical communication system, chromatic dispersion and polarization mode dispersion characteristics in fibers are becoming the key factors that affects the performance of the communication system.Dispersion and polarization mode dispersion measurement are of great significance. we can not only carry on the quality inspection to the large factory optical fiber, but also monitor the quality of the communication link to determine whether to upgrade or repair the lines by measuring the dispersion and polarization mode dispersion of fibers. So chromatic dispersion and polarization mode dispersion test instrument has a good market prospects. At present, the dispersion and polarization mode dispersion measurement methods are mature, but the research on the test instrument and its measurement scheme is very few in China. What’s worse,very little manufacturers are involved in the design and manufacture of the instrument in our country.According to the present situation of chromatic dispersion and polarization mode dispersion measurement and the demand of low cost and high precision measuring instruments, it is very important to research the test instrument and its measuring methods.This paper focuses on the measurement scheme of chromatic dispersion and polarization mode dispersion test instruments in single mode fiber. Researchs are as follows:(1) The advantages and disadvantages of the current measurement methods are analyzed and compared. Advices for dispersion and polarization mode dispersion measurement scheme in the metropolitan area are provided.(2) According to the measurement requirements of chromatic dispersion in the metropolitan area network, a scheme of dispersion measurement based on digital phase detection is proposed. The simulation platform based on OptiSystem and MATLAB is built and the effect is verified. The simulation results verify the correctness of scheme and high precision of digital phase phase detector. Corresponding experimental system was set up, experiment results show that the accumulated chromatic dispersion accuracy of different length G.652 fiber at 1550nm are less than 10ps/nm, which are better than the commercial CD analyzer for metropolitan area network environment. And the measurement cost. is reduced.(3) According to the measurement requirements of polarization mode dispersion in the metropolitan area network, we improve the fixed analysis method and a polarization mode dispersion measurement scheme based on particle swarm optimization algorithm is proposed. The corresponding experimental system was set up, PMD measurement result shows that the average error is less than 0.2ps. The schme is of high repeatability and is easy to implement. What is more, Gauss cueve fitting algorithm based on particle swarm optimization not only ensures the measurement accuracy,but also improves the measurement speed.更多还原