基于210km实地通信链路的高稳定性光学频率信号传递  

Ultra-Stable Optical Frequency Signal Transfer in 210 km Urban Communication Link

作　　者：臧琦[1,2,3] 邓雪[1,3] 曹群[1,2,3] 高静[1,3] 焦东东[1,3] 刘杰[1,3] 许冠军[1,3] 董瑞芳[1,2,3] 刘涛[1,2,3] 张首刚[1,2,3] 

机构地区：[1]中国科学院国家授时中心,陕西西安710600 [2]中国科学院大学,北京100049 [3]中国科学院时间频率基准重点实验室,陕西西安710600

出　　处：《光学学报》2017年第7期67-74,共8页Acta Optica Sinica

基　　金：国家自然科学基金(91636101);中国科学院战略性先导科技专项(B类)(XDB21030800);国家重点研发计划(2016YFF0200200);国家自然科学基金青年基金(11403031);西部青年学者(B类)(XAB2016B74)

摘　　要：利用西安和咸阳之间的电信省级骨干光纤网构建了210km的光学频率信号传递测试链路,链路损耗为0.23dB/km。实验中采用可搬运、基于光纤干涉仪、线宽约为200 Hz的激光器作为光源,利用两台低噪声双向掺铒光纤放大器(EDFA)补偿光纤链路损耗和增加光信号的传输距离,放大器平均增益控制在15dB左右,以防止激射。通过测量和分析不同情况下光纤链路的附加相位噪声,可观测到铁路震动引起的规律性干扰。当噪声抑制系统在锁定状态时,链路的相位噪声被抑制了23dB,在剔除铁路干扰时段数据后,获得的210km实地通信链路的秒级频率稳定度达到了1.51×10-14,万秒频率稳定度达到了5×10-17。利用210km通信链路进行了光学频率信号的远程传递测试,分析了限制频率稳定度的主要影响因素,并针对现行光纤布设方式提出了补充要求。该研究为基于通信链路的高精度光学频率信号的传递与比对提供理论支撑。We establish a 210 km optical frequency signal transfer test link along the telecom provincial backbone optical fiber network between Xian and Xian Yang,and the loss of the link is 0.23 dB/km.A fiber interferometer based laser with linewidth of 200 Hz is used as the light source,and the laser is conveyable.Two bilateral erbiumdoped optical fiber amplifiers（EDFAs）with low noise are used to compensate the fiber link loss and increase the transmission distance of signal.The average gain of amplifier is controlled at about 15 dB to avoid the self-excited oscillation.The additional phase noise of the fiber link under different conditions is measured and analyzed,and the regular disturbance caused by the railway vibration is observed.The phase noise in the link is suppressed by 23 dB when we use the noise suppression system.When the noise data from the railway vibration is eliminated,the second level frequency stability of the 210 km urban communication link can achieve 1.51×10-14 and be better than5×10-17at 104 s.The remote transfer test for optical frequency signal based on 210 km communication link is completed,and the main influence factors limiting the frequency stability are analyzed.The supplementary requirements are put forward for the current fiber setting way.The study provides theoretical supplement for achieving high accuracy optical frequency signal transmission and comparison based on the communication link.

关 键 词：光纤光学 光学频率信号传递 光纤网络 实地光纤链路 光放大 光钟比对 

分 类 号：TN929.11[电子电信—通信与信息系统]