基于光纤频率传递的高精度时间传递方法  

Ultra-High Precision Time Transfer Based on Fiber Frequency Transfer

作　　者：陈法喜[1] 李博[2] 郭宝龙[1] Chen Faxi;Li Bo;Guo Baolong(Xidian University,Xi′an 710071,Shaanxi,China;National Time Service Center,Chinese Academy of Sciences,Xi′an 710600,Shaanxi,China)

机构地区：[1]西安电子科技大学,陕西西安710071 [2]中国科学院国家授时中心,陕西西安710600

出　　处：《光学学报》2022年第15期12-18,共7页Acta Optica Sinica

基　　金：国家自然科学基金青年项目(12003042,12103059)。

摘　　要：为了进一步提高时间传递的稳定度,提出了一种基于光纤频率传递的高精度时间传递方法。在保证光纤时间传递不确定度的情况下,结合光纤频率传递的高稳定度特性,所提方法实现了兼具高稳定度和良好不确定度的光纤时间传递。在光纤时间频率传递的基础上,利用光纤频率传递系统输出的频率信号再生出具有高稳定度的1PPS(one pulse per second)时间信号,并使再生的1PPS时间信号跟踪光纤时间传递系统输出的1PPS时间信号,进而使再生出的1PPS时间信号同时具有较好的稳定度和不确定度。为了验证所提方法的可行性,使用光纤链路测得的时间传递数据进行仿真实验,所提方法使光纤时间传递稳定度提高至0.5 ps@1 s和0.09 ps@10^(4)s。在500 km长的实验室光纤链路上,利用光纤时间频率传递实验装置进行了测试,所提方法实现了稳定度为2.5 ps@1 s和0.9 ps@10~5s,不确定度为6.4 ps的高精度时间传递。A high-precision time transfer method based on fiber frequency transfer is proposed to achieve higher stability of time transfer.On the premise of ensuring the uncertainty of time transfer,the proposed method can achieve the fiber time transfer with high stability and good uncertainty considering the high stability of fiber frequency transfer.On the basis of the fiber time and frequency transfer,the highly stable 1PPS(one pulse per second)time signal is regenerated using the frequency signal transmitted from the fiber frequency transfer system.Then,the regenerated 1PPS time signal tracks the1PPS time signal transmitted by the fiber time transfer system,which renders the regenerated 1PPS time signal good stability and uncertainty simultaneously.The time transfer data measured by fiber links are used to conduct simulation experiments to verify the feasibility of the proposed method.The results indicate that under the proposed method,the fiber time transfer stability reaches 0.5 ps@1 s and 0.09 ps@10~4s.The experiment device for the fiber time and frequency transfer is employed to perform a test on a fiber link of 500 km,and the result demonstrates that the high-precision time transfer can be achieved by the proposed method,with the stability of 2.5 ps@1 s and 0.9 ps@10~5s,and the uncertainty of6.4 ps.

关 键 词：光纤光学 频率传递 时间传递 时间再生 

分 类 号：TN929.11[电子电信—通信与信息系统]