基于本地测量的双向光学相位比对方法

发布时间：2018-04-14 20:48

  本文选题：光纤光学 + 双向光学相位比对　； 参考：《中国激光》2017年05期

【摘要】：为了更好地实现远程光钟之间的高精度比对,对意大利Calosso小组所提出的光纤双向光学相位比对方案进行了拓展,提出了一种基于本地测量的双向光学相位比对方法。同源的两路光信号从同一光纤两端注入,其中一路光信号经光纤传输到远端后经反射原路返回本地端,另一路光信号从远端经光纤传输至本地端。两个信号均在本地端与参考光进行拍频,将拍频得到的两路拍频信号的相位进行比对。利用这种结构,系统不需要有源光纤相位噪声补偿也可以消除叠加在光纤链路上的共模相位噪声,该结构的最大优势在于拍频信号的采集和处理均可以在本地端完成,不需要引入额外的时间同步信号来保证两地拍频信号采集同步进行,简化了实验系统。计算分析了该方案的相位噪声极限,并建立了基于60km缠绕光纤的示范系统来进行测试,测得其秒级频率稳定度为1.45×10~(-16),千秒稳定度达到1.51×10~(-19)。该方案有望用于远程光钟和其他原子钟之间更可靠的高精度频率比对。
[Abstract]:In order to better realize the high precision comparison between long distance optical clocks, the scheme of optical fiber bidirectional optical phase alignment proposed by Calosso team in Italy is extended, and a bidirectional optical phase alignment method based on local measurement is proposed.Two optical signals of the same origin are injected from the two ends of the same fiber, one optical signal is transmitted through the fiber to the distal end, and the other is transmitted from the far end through the fiber to the local end.The two signals are beat with the reference light at the local end, and the phase of the two beat signals is compared.With this structure, the common-mode phase noise superimposed on the fiber link can be eliminated without the need of the active fiber phase noise compensation. The biggest advantage of the structure is that the acquisition and processing of the beat signal can be completed at the local end.It is not necessary to introduce extra time synchronization signal to ensure the synchronization of the two beat signals, which simplifies the experimental system.The phase noise limit of this scheme is calculated and analyzed, and a demonstration system based on 60km winding fiber is set up to test it. The frequency stability of second order is 1.45 脳 10 ~ (-10) ~ (-16), and the stability of KS is 1.51 脳 10 ~ (10) ~ (-19).This scheme is expected to be used for more reliable frequency comparison between long-range light clocks and other atomic clocks.
【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】：中国科学院战略性先导科技专项(B类)(XDB21030800) 国家自然科学基金(91636101);国家自然科学基金青年科学基金(11403031) 国家重点研发计划(2016YFF0200200)
【分类号】：TN929.11
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本文编号：1750954