基于双纤单向波分复用技术的时间同步系统  

A time synchronization system based on dual fiber unidirectional wavelength division multiplexing technology

作　　者：陈丁[1,2] 许江宁 谭小容[1,2] 简芳洪[3] CHEN Ding;XU Jiang-ning;TAN Xiao-rong;JIAN Fang-hong(College of Electronic and Information Engineering,Jiujiang University,Jiujiang 332005,China;College of Electrical Engineering,The Chinese People′s Liberation Army Naval University of Engineering,Wuhan 430033,China;College of Science,Jiujiang University,Jiujiang 332005,China)

机构地区：[1]九江学院电子信息工程学院,江西九江332005 [2]中国人民解放军海军工程大学电气工程学院,湖北武汉430033 [3]九江学院理学院,江西九江332005

出　　处：《激光与红外》2021年第11期1485-1491,共7页Laser & Infrared

基　　金：国家自然科学基金项目(No.41804076);国家重点研发计划项目(No.2016YFB0501700,No.2016YFB0501701)资助。

摘　　要：提出了一种基于双纤单向波分复用技术的时间同步系统。系统主从站点之间由双光纤链路连接,通过4台时间间隔计数器对两种波长、4路时间信号的传输时延值测量及对应的比值关系,可对主从站点的时钟钟差进行精准测算。本方案算法可消除环境温度对光纤长度、折射率、传输群时延等因素的影响。主从站点分别由100 km和90 km两根光纤相连,当光纤链路温度在-20~40℃变化环境下,采用1310~1550 nm波长时,能够将主从站点钟差估算误差降低约1.3 ns,采用1490~1550nm波长时,授时精度将提升约200 ps。A time synchronization system based on the dual fiber unidirectional wavelength division multiplexing technology is proposed.The master and slave stations of the system are connected by dual optical fiber links.Four time interval counters are used to measure the transmission delay of two wavelengths and four time signals,and the clock difference of master-slave station can be accurately measured.This method can eliminate the influence of ambient temperature on fiber length,refractive index and transmission group delay.The master and slave stations are connected by 100 km and 90 km optical fibers respectively.When the temperature of optical fiber link changes from-20℃to 40℃,the clock difference estimation error of master and slave stations can be reduced by about 1.3 ns with 1310~1550 nm wavelength,and the time service accuracy can be improved by about 200 ps with 1490~1550 nm wavelength.

关 键 词：光纤传输 时间同步 双纤单向 波分复用 瞬时钟差 

分 类 号：TN929.11[电子电信—通信与信息系统]