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环境温度和激光器输出波长变化引起的光纤链路时延波动直接影响光纤时间传递的稳定性。采用链路分段处理方法推导了长距离光纤时间传递的稳定性与激光器输出波长及链路温度变化之间的关系;通过分析实测的激光器波长波动数据,建立了激光器波长波动模型。基于实际温度数据构造了3000 km光纤链路,分析了波长波动和链路铺设深度等对双向时分复用(BTDM)和波分复用(WDM)光纤时间传递稳定性的影响。结果表明:光纤链路温度变化主要影响光纤时间传递的长期稳定性,且这种影响与光纤链路铺设深度和时间传递工作季节有关;激光器波长的随机抖动主要影响光纤时间传递的短期稳定性,而波长漂移主要影响漂移周期对应时间尺度上的时间传递稳定性。当两端激光器波长随机抖动标准差从(0.07,0.05)pm变化为(0.27,0.25)pm时,3000 km光纤时间传递的稳定度由3 ps/s恶化为12 ps/s。
Fluctuations in the optical fiber link delay due to changes in ambient temperature and laser output wavelength directly affect the stability of the optical fiber time transfer. The relationship between the stability of long-distance optical fiber time transfer and laser output wavelength and link temperature is deduced by link segmentation method. By analyzing the measured laser wavelength fluctuation data, a laser wavelength fluctuation model is established. Based on the actual temperature data, a 3000 km optical fiber link is constructed, and the influence of wavelength fluctuation and link laying depth on the time transfer stability of bidirectional time division multiplexing (BTDM) and wavelength division multiplexing (WDM) optical fibers is analyzed. The results show that the change of optical fiber link temperature mainly affects the long-term stability of optical fiber time transmission, and this kind of influence is related to the laying depth of optical fiber link and the working season of time transmission. The random jitter of laser wavelength mainly affects the short-term stability of optical fiber time transmission, The wavelength drift mainly affects the time transfer stability on the corresponding time scale of the drift period. When the stochastic standard deviation of laser jitter at both ends changes from (0.07,0.05) pm to (0.27,0.25) pm, the stability of time transfer of 3000 km fiber deteriorates from 3 ps / s to 12 ps / s.