高精度时间信号的光纤传递

High Precision Time Transfer with Optical Fiber

天基时间同步网络的精度限制以及光钟的出现,使得用光纤来进行时间信号的传递和检测成为高精度时间同步的主要方案之一。介绍了高精度时间传递和检测的原理,分析了利用光纤进行高精度时间传递的同步误差来源,并提出了相应的改善措施。采用一种新型的模拟与数字混合编码和检测的方式设计实现了一个利用光纤链路进行高精度时间传递的实验系统,验证了所提出的改善系统性能的措施。实验测试表明,光纤时间同步精度在200ps以内,时间同步准确度在±600ps以内,此结果优于以往任何形式的天基时间传递系统。

Due to the limited precision of the existing space-based time synchronization network and the emergence of optical clock,using fiber to transfer and detect time signal has become a major high-precision time-synchronization system.The principle of high precision time transfer is introduced,the sources of error in time transfer system using optical fiber are analyzed and some methods to improve the system are proposed.Meanwhile,a new coding and decoding mixed with analog and digital methods is used to design and outcome a time transfer system with optical fiber line.Finally,the experiment of optical time transfer system is carried out and the time accuracy is tested,which is approximately 200 ps while the time veracity is ±600 ps.These result are better than any existing space-based time transfer system.