基于光纤传输的1.5GHz信号的稳相系统设计与测试  

Design and test of a 1.5 GHz phase stabilization system based on optical fiber transmission

作　　者：江永琛[1,2] 王锦清[1,2] 苟伟[1,2] 虞林峰[1,2] 

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院射电天文重点实验室,南京210008

出　　处：《时间频率学报》2017年第3期137-145,共9页Journal of Time and Frequency

基　　金：国家自然科学基金资助项目(11303076)

摘　　要：设计了一款基于光纤传输的1.5 GHz的稳相频标传输系统,实现系统在光纤介质中传输的相位校准。文中对系统的稳相原理和性能进行了分析和评估,然后对光纤稳相系统的性能进行了测试分析。包括实验室中的高低温箱测试以及地埋长光纤的实测。结果表明,基于目前的测试系统,与未稳相时相比,稳相系统对相位波动的长时间改善效果达到130多倍。文中还对光纤本身的温度系数进行了测试与分析,得到了光纤温漂系数。为了解决频率稳定度和相噪恶化的问题,文中还引入了一款高稳定度的晶振锁相模块,并给出了多组实测数据,使得频率稳定度和相噪都得到了明显的改善。该系统将应用到上海天马65 m射电望远镜系统的频标信号传输中。In this paper, a 1.5 GHz phase stabilization system is designed and tested for optical fibertransmission. The phase stabilization principle of the equipment is described and its performance is analyzed andevaluated. The system is tested with fiber in high-and-low temperature test chamber and measured with longburied fiber. The results show that the improvement of phase stability is more than 130 times for long-term basedon the current system. The temperature coefficient of the fiber itself is also tested and analyzed in this paper. Inorder to solve the problem of deterioration of frequency stability and phase noise, a high stability crystalvibration phase lock module is introduced to this system. Through multiple sets of test data, the frequencystability and phase noise have been improved obviously. This system will be applied to Shanghai TMRT （TianMa 65 m radio telescope） system for standard frequency signal’s transmission.

关 键 词：光纤传输 相位校准 频率稳定度 相噪 

分 类 号：P111.44[天文地球—天文学]