光纤链路时延波动对频率传递稳定度的影响

为研究光纤频率传递的稳定度损失，分析了光纤链路时延波动对频率传递稳定度的影响，得出因温度变化引起的链路长度变化、折射率变化和激光器输出波长漂移带来的时延波动是影响频率传递稳定度的主要因素。建立Round-trip时序模型，定量分析时延波动残留，发现因环境温度缓变引入的时延波动可以得到有效补偿，因激光器动态结温度快变导致输出波长漂移引入的时延波动无法有效补偿，是稳定度损失的关键因素。降低激光器动态结温度的变化速率，是提高频率传递稳定度的有效手段。要使时延波动对频率传递稳定度的影响小于10-15 s-1、10-20 d-1 (d-1即每天)，必须采取有效的温控措施，精确控制激光器动态结温度变化率，使其小于0.04℃/s。

Abstract

In order to study the performance of frequency transfer based on fiber link, the impact of the transfer delay fluctuation upon the frequency transfer stability is analyzed. It is found that the transfer delay fluctuations caused by the variations in refractive index, the variation in fiber link length, and the excursion in laser output wavelength are major factors reducing the stability of frequency transfer. Using the newly established round-trip timing sequence model, it is shown that the transfer delay fluctuation resulting from temperature slow variation can be compensated, but the transfer delay fluctuation caused by temperature fast variation cannot be compensated. Reducing the rate of the dynamic junction temperature variations of laser is an effective method to improve the stability of frequency transfer. In order tosatisfy the requirement that the short term stability and long term stability are less than 10-15 s-1 and 10-20 d-1, respectively, some effective measure, must be taken and the rate of the dynamic junction temperature variations of laser must be precisely controlled to be less than 0.04 ℃/s.

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李得龙, 程清明, 张宝富, 卢麟, 雷平纪, 李晓亚. 光纤链路时延波动对频率传递稳定度的影响[J]. 激光与光电子学进展, 2014, 51(1): 010602. Li Delong, Cheng Qingming, Zhang Baofu, Lu Lin, Lei Pingji, Li Xiaoya. Research on the Impact of Optical Fiber Link Delay Fluctuation on Frequency Transfer Stability[J]. Laser & Optoelectronics Progress, 2014, 51(1): 010602.

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