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基于波分复用技术,通过级联方式在230 km光纤链路中实现了频率和时间的同传。该级联系统包含了150 km和80 km两级链路系统,其中为了补偿150 km光纤链路中的损耗,在链路中间放置了一个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,整个级联系统的频率稳定度为3.1×10~(-14)(平均时间1 s时)和6.3×10~(-18)(平均时间104s时),时间稳定度为3.5 ps(平均时间102~104s时)。实验结果也证明,不管是对频率信号还是时间信号,都满足误差理论,整个系统的稳定度几乎等于两级链路稳定度的标准偏差。同时通过两级系统的校准,最后得到整个级联系统的时间同步准确度为90 ps。
Based on wavelength division multiplexing, frequency and time synchronization is achieved in a 230 km fiber link by cascading. The cascade system includes 150 km and 80 km two-stage link systems where a bidirectional erbium-doped fiber amplifier is placed in the middle of the link to compensate for losses in the 150 km fiber link. After each level of transmission system is stabilized by optical compensation, the frequency stability of the whole cascaded system is 3.1 × 10 ~ (-14) (average time 1 s) and 6.3 × 10 ~ (-18) (average time 104s), the time stability of 3.5 ps (average time 102 ~ 104s). The experimental results also prove that the error theory is satisfied both for the frequency signal and the time signal, and the stability of the entire system is almost equal to the standard deviation of the two-level link stability. At the same time through the two-level system calibration, and finally get the entire cascaded system time synchronization accuracy of 90 ps.