摘要
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。
The delay fluctuations of optical fiber link, related to the variations of laser output wavelength and ambient temperature along the transmission link, directly affect the stability of fiber-optic time transfer. The relationship between the stability of long distance fiber- optic time transfer and the variations of laser wavelength and the temperature of optical fiber link is derived by using a link segmentation processing method. Wavelength fluctuations are modeled based on the analysis of measured wavelength data of laser. A 3000 km optical fiber link is emulated based on the actual temperature data, and the effects of wavelength fluctuations and depth of buried optical fiber link on the stability of fiber- optic time transfer adopting bidirectional time division multiplexing（BTDM） and wavelength division multiplexing（WDM） respectively are analyzed. The results show that the temperature variations of optical fiber link mainly have effect on the long-term stability, and this effect changes with the depth of buried optical fiber link and work season of time transfer. The wavelength jitter of laser mainly degrades the short-term stability of fiber-optic time transfer, while the wavelength drift of laser mainly has impact on the stability at the averaging time related to the cycle of wavelength drift. When the standard deviation of wavelength jitter of laser changes from（0.07, 0.05） pm to（0.27, 0.25） pm, the stability of 3000 km fiber-optic time transfer will deteriorate from3 ps/s to 12 ps/s.
出处
《激光与光电子学进展》
CSCD
北大核心
2016年第4期45-51,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61127016
61107041)
关键词
光纤光学
长距离时间传递
时间稳定性
时延波动
fiber optics
long-distance time transfer
time stability
delay fluctuations
