超长距离精密光纤时间传递技术的应用研究

Application Research of Ultra-Long Distance Precise Optical Fiber Time Transfer Technology

传统的精密有线时间传递技术不能有效地消除线路随机噪声、不对称性时延和时基老化等因素的影响,其应用场景也受到很大的限制,为此文章提出一种新的10 ns级超长距离光纤时间传递技术,该技术方案采用了“波分单纤双向”主从同步法、光纤时延伺服锁定和精确测量控制技术。分析和阐述了该技术方案实现的数学模型和时间传递的基本原理,给出实现20跳、2000 km超长距离精密光纤时间传递的试验验证模型及其验证测试结果,结果表明该方案可以实现2000 km、10 ns级的时间传递,适合于灵活、大规模地构建高精度广域地基授时网络等应用场景。最后展望了超2000 km距离、10 ns级的光纤时间传递技术的应用前景。

With the traditional precise wire time transfer technology,the influence of the line random noise,the asymmetric delay,the time-base aging and other factors is difficult to be effectively eliminated,and its application scenarios are also limited.To solve this problem,a new optical fiber time transfer technology of 10 ns level and ultra-long distance is proposed.In the technical scheme,the master-slave synchronization method for the“wavelength division single fiber bidirectional”,the optical fiber delay servo locking and precision measurement and control technology are adopted.The mathematical model and basic principle of its time transfer are analyzed and expounded.The experimental verification model of the precision optical fiber time transfer of 20 hops and 2000 km ultra-long distance are presented,as well as its test results.It is verified that the time transfer of 2000 km distance and 10 ns level can be realized by using the technical scheme,and that it is suitable for the application scenarios of the large-scale and flexible construction of the high precision wide area ground-based time service network,etc.The application of the optical fiber time transfer technology of 10 ns level over 2000 km distance is prospected.