Author Affiliations
Abstract
1 Key Laboratory for Quantum Optics, CAS, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
3 Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
4 e-mail: hwcai@siom.ac.cn
Based on dense wavelength-division multiplexing technology, frequency transfer and time synchronization are simultaneously realized over a compensated cascaded fiber link of 430 km, which is a part of the Beijing–Shanghai optical fiber backbone network. The entire cascaded system consists of two stages with fiber links of 280 and 150 km, respectively. To keep high symmetry and low noise, specific bi-directional erbium-doped fiber amplifiers are used to compensate the large optical attenuation of each fiber link. When the compensation servo is active in every stage, the cascaded system achieves the stability of 1.94×10 13 at 1 s and 1.34×10 16 at 104 s, for frequency transfer. It is also verified that the actual results of the cascaded system are in good agreement with the theoretical ones calculated from error theory. Simultaneously, after calibration of each stage, time synchronization is also realized. The final accuracy of the whole system is within 94 ps.
060.2360 Fiber optics links and subsystems 060.2340 Fiber optics components 120.7000 Transmission Chinese Optics Letters
2016, 14(7): 070602
1 中国科学院上海光学精密机械研究所中科院量子光学重点实验室, 上海 201800
2 中国科学与技术大学量子信息与量子科技前沿协同创新中心, 合肥 安徽 230026
3 中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
通过级联方式在京沪光纤骨干网中实现了430 km的高精度频率传递。该级联系统包含了280 km和150 km两级系统,同时为了补偿光纤损耗,在两级链路中采用了低噪声高对称的双向掺铒光纤放大器。当每一级传递系统通过光学补偿方式达到稳定后，整个级联系统引入的频率不稳定度为在1 s处1.02×10-13和在104 s处8.24×10-17，实验结果验证了级联系统的实际结果与两级系统计算结果之间符合误差理论。
光纤光学 频率传递 级联系统 光学补偿
1 中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
2 中国科学院上海光学精密机械研究所中国科学院量子光学重点实验室, 上海 201800
3 中国科学技术大学量子信息与量子科技前沿协同创新中心, 安徽 合肥 230026
为实现准国土范围内高精度授时和守时，利用光纤传递铯钟、氢钟等高精度原子钟的时频信号，在实际光纤链路上验证其长距离传递性能。采用波分复用和双向双波长的传输方法，介绍了在275 km京沪干线上实现高精度时频传递的相关工作。针对长距离光纤链路的特点，探讨了链路损耗与散射、色散与频率噪声、补偿系统动态范围和反馈带宽等对时频传递性能的影响。实验获得了频率信号的秒稳定度达5×10-14和天稳定度达7×10-18的传递性能，同时，千秒尺度下的时间方差可达2.4 ps。
光纤光学 时频传递 时间同步 波分复用
