基于双纤环回比值法的光纤时间同步技术  

Optical Fiber Time Synchronization Technology Based on Double Fiber Round-Trip Ratio Method

作　　者：陈丁 许江宁[1] 吴苗[1] 何泓洋[1] Chen Ding;Xu Jiangning;Wu Miao;He Hongyang(College of Electrical Engineering,The Chinese People’s Liberation Army Naval University of Engineering,Wuhan,Hubei 430033,China;College of Electronic and Information Engineering,Jiujiang University,Jiujiang,Jiangxi 332005,China)

机构地区：[1]中国人民解放军海军工程大学电气工程学院,湖北武汉430033 [2]九江学院电子信息工程学院,江西九江332005

出　　处：《激光与光电子学进展》2021年第17期164-170,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(41804076);国家重点研发计划(2016YFB0501700,2016YFB0501701)。

摘　　要：提供了一种基于双纤环回比值法的光纤时间同步技术,系统通过3个时间间隔计数器的测量值及相关比值关系,可直接测算出主站到从站的单向传输的时延值,消除了环境温度变化导致的光纤长度膨胀变化及往返时延值的变化对时间同步精度的影响。主从站点分别由100 km和75 km光纤相连,当光纤链路温度在-20~40℃内变化的环境下,采用1490 nm和1550 nm波长时,能够将单向时延估算误差降低约260 ps,采用1310 nm和1550 nm波长时,授时精度提升约1.3 ns。This paper provides an optical fiber time synchronization technology based on the double fiber round-trip ratio method.The system can directly measure the unidirectional transmission delay from a master station to a slave station through the measured values of three time interval counters and the correlation ratio relationship.This method eliminates the influences of fiber length expansion and round-trip delay caused by environmental changes on the time synchronization accuracy.The master and slave stations are connected by 100 km and 75 km optical fibers,respectively.When the fiber link temperature changes from-20℃to 40℃and the wavelengths of 1490 nm and1550 nm are used,the estimation error of unidirectional delay can be reduced to 260 ps,approximately.When1310 nm and 1550 nm wavelength pair is used,the timing accuracy is improved about 1.3 ns.

关 键 词：光纤光学 时间同步 波分复用 时延比值 环回法 

分 类 号：TN929.11[电子电信—通信与信息系统]