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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。
In order to study the stability loss of fiber frequency transfer, the influence of fiber link delay fluctuation on frequency transfer stability was analyzed. The change of link length due to temperature change, refractive index change and laser output wavelength drift Delay fluctuations are the main factors affecting the stability of frequency transfer. The Round-trip timing model is established to quantitatively analyze the residual of the delay variation. It is found that the delay variation caused by the slowly changing ambient temperature can be effectively compensated. Due to the fast fluctuation of the dynamic junction temperature of the laser, the delay fluctuation introduced by the output wavelength drift can not be effectively compensated. Is a key factor in the loss of stability. Reducing the rate of change of the dynamic junction temperature of the laser is an effective way to improve the stability of the frequency transfer. In order to make the influence of the delay fluctuation on the frequency transfer stability less than 10 ~ (-15) s ~ (-1) and 10 ~ (-20) d ~ (-1) (d ~ (-1) Take effective temperature control measures, precise control of laser dynamic junction temperature rate of change, so that it is less than 0.04 ℃ / s.