Robust Transfer of Optical Frequency over 500km Fiber Link with Instability of 10-21

被引：3

作者：

Zhou, Qian ^{[1
,2
,3
,4
]}

Zhang, Xiang ^{[1
,3
]}

Zang, Qi ^{[1
,3
]}

Wu, Mengfan ^{[1
,3
]}

Wang, Dan ^{[1
,2
,3
]}

Liu, Jie ^{[1
,3
]}

Dong, Ruifang ^{[1
,2
,3
]}

Liu, Tao ^{[1
,2
,3
,4
]}

Zhang, Shougang ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Key Lab Time & Frequency Stand, Xian 710600, Peoples R China

[4] Hefei Natl Lab, Hefei, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2024年 / 41卷 / 08期

基金：

中国国家自然科学基金;

关键词：

ATOMIC CLOCK; STABILITY; TIME; CARRIER;

D O I：

10.1088/0256-307X/41/8/084202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Our primary objective is to mitigate the adverse effects of temperature fluctuations on the optical frequency transmission system by reducing the length of the interferometer. Following optimization, the phase-temperature coefficient of the optical system is reduced to approximately 1.35 fs/K. By applying a sophisticated temperature control to the remained "out-of-loop" optics fiber, the noise floor of the system has been effectively lowered to 10(-21) level. Based on this performance-enhanced transfer system, we demonstrate coherent transmission of optical frequency through 500-km spooled fiber link. After being actively compensated, the transfer instability of 4.5 x 10(-16) at the averaging time of 1 s and 5.6 x 10(-21) at 10000 s is demonstrated. The frequency uncertainty of received light at remote site relative to that of the origin light at local site is achieved to be 1.15 x 10(-19). This enhanced system configuration is particularly well suited for future long-distance frequency transmission and comparison of the most advanced optical clock signals.

引用

页数：6

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