本文選題：光纖光學 + 雙向光學相位比對��； 參考：《中國激光》2017年05期

【摘要】：為了更好地實現(xiàn)遠程光鐘之間的高精度比對,對意大利Calosso小組所提出的光纖雙向光學相位比對方案進行了拓展,提出了一種基于本地測量的雙向光學相位比對方法。同源的兩路光信號從同一光纖兩端注入,其中一路光信號經光纖傳輸?shù)竭h端后經反射原路返回本地端,另一路光信號從遠端經光纖傳輸至本地端。兩個信號均在本地端與參考光進行拍頻,將拍頻得到的兩路拍頻信號的相位進行比對。利用這種結構,系統(tǒng)不需要有源光纖相位噪聲補償也可以消除疊加在光纖鏈路上的共模相位噪聲,該結構的最大優(yōu)勢在于拍頻信號的采集和處理均可以在本地端完成,不需要引入額外的時間同步信號來保證兩地拍頻信號采集同步進行,簡化了實驗系統(tǒng)。計算分析了該方案的相位噪聲極限,并建立了基于60km纏繞光纖的示范系統(tǒng)來進行測試,測得其秒級頻率穩(wěn)定度為1.45×10~(-16),千秒穩(wěn)定度達到1.51×10~(-19)。該方案有望用于遠程光鐘和其他原子鐘之間更可靠的高精度頻率比對。
[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.
【作者單位】： 中國科學院國家授時中心;中國科學院大學;中國科學院時間頻率基準重點實驗室;
【基金】：中國科學院戰(zhàn)略性先導科技專項(B類)(XDB21030800) 國家自然科學基金(91636101);國家自然科學基金青年科學基金(11403031) 國家重點研發(fā)計劃(2016YFF0200200)
【分類號】：TN929.11
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本文編號：1750954