摘要
理论推导了光纤链路双向时延差(TDEV)的稳定度与温度、双向时间间隔、波长间隔,以及距离的关系,并分析了温度对双向时分复用(TDM)光纤时间传递精度的影响。结果表明,随着温度变化幅度、双向时间间隔、以及传输距离的增加,双向TDM光纤链路时延差的稳定度逐渐变差。典型温度变化情况下,时间间隔小于100 ms时,3000 km双向TDM光纤链路时延差的稳定度优于1 ps/d。相同温度变化和距离的情况下,时间间隔小于100 ms的双向TDM光纤链路时延差的稳定度优于波长间隔为0.1 nm的双向波分复用(WDM)光纤链路。在实验室内,进行了双向TDM光纤时间传递实验。实验结果表明:室温环境下双向TDM光纤时间传递系统不对称偏差的均值随光纤长度(2 m^100 km)的变化小于29 ps,接近时间间隔测量仪器的噪底。100 km光纤双向TDM光纤时间传递的稳定度优于30 ps/s和20 ps/d。
The relationship of bidirectional propagation time deviation of optical fiber link with the temperature,bidirectional time interval, wavelength difference, and fiber length is derived. The influence of temperature on the precision of bidirectional fiber-optic time transfer based on time division multiplexing（TDM） is analyzed theoretically. The results show that the stability of time deviation of bidirectional TDM fiber link is degraded with the increase of the amplitude of temperature change, bidirectional time interval, and fiber length. For typical ambient temperature change, the stability of time deviation of 3000 km TDM fiber link can be less than 1 ps/d when the bidirectional time interval is less than 100 ms. When temperature change and fiber length are same, the stability of time deviation of bidirectional TDM fiber link with a time interval of less than 100 ms is always less than that of wavelength division multiplexing（WDM） fiber link with a wavelength spacing of larger than 0.1 nm. Bidirectional TDM time transfer experiments are carried out in laboratory on different lengths of fiber. The results show that the fluctuation of average asymmetry of TDM time transfer system is less than 29 ps when the fiber length is changed from 2 m to 100 km, close to the noise floor of the adopted time interval counter. The measured stabilities of bidirectional TDM time transfer over 100 km fiber link are better than 30 ps/s and 20 ps/d, respectively.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第5期97-103,共7页
Acta Optica Sinica
基金
国家自然科学基金(61127016
61107041)
关键词
光纤光学
时间传递
光纤温度系数
时间偏差
fiber optics time transfer optical fiber temperature coefficient time deviation
