基于210km实地通信链路的高稳定性光学频率信号传递

发布时间：2018-12-29 08:17

【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。
[Abstract]:The optical frequency signal transmission test link of 210km is constructed by using the provincial backbone optical fiber network between Xi'an and Xianyang. The link loss is 0.23dBr / km. In the experiment, two low-noise bidirectional erbium-doped fiber amplifiers (EDFA) are used to compensate the fiber link loss and increase the transmission distance of the optical signal by using a transportable fiber interferometer with a line width of about 200 Hz as the light source, and two low-noise bidirectional erbium-doped fiber amplifiers (EDFA). The average gain of the amplifier is controlled around 15dB to prevent firing. By measuring and analyzing the additional phase noise of fiber link under different conditions, the regular interference caused by railway vibration can be observed. When the noise suppression system is in the locked state, the phase noise of the link is suppressed by 23dB.The second frequency stability of the 210km field communication link is 1.51 脳 10-14 after the railway interference period data is excluded. The frequency stability of ten thousand seconds is 5 脳 10 ~ (-17). The remote transmission test of optical frequency signal is carried out by using 210km communication link, the main influencing factors of limiting frequency stability are analyzed, and the supplementary requirements are put forward for the present optical fiber layout mode. The research provides theoretical support for the transmission and comparison of high precision optical frequency signals based on communication links.
【作者单位】：中国科学院国家授时中心;中国科学院大学;中国科学院时间频率基准重点实验室;
【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)
【分类号】：TN929.11

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