中文摘要：

针对光纤传输链路因受光信号衰减、温度变化和振动等因素引起的光学相位起伏,影响时间比对精度的问题,研究了基于双向伪码测距原理的光纤双向时间比对方法,并搭建模型系统进行了实验验证。结果表明,通过单光纤双向双波长的传输方案,在65 km光纤链路上,抵消了往返链路传输时延的不对称性,使时间比对精度可达108 ps。温度变化引起光纤折射率变化是导致时延波动的主要因素,对温度变化与光纤时延的关系进行了分析和仿真,通过温度试验验证了光纤时延随温度变化的温度漂移系数与理论值相符。

英文摘要：

The time transfer accuracy is influence by optical phase fluctuation of transmission link based on optical fiber caused by optical signal attenuation, temperature variation and vibration.In view of this problem, this paper studies an optical-fiber two-way time transfer method based on two-way pseudo noise （PN） ranging principle, and builds the model system for test and verification. The results show that the single optical-fiber two-way dual-wavelength transmission scheme can eliminate the asymmetry of to-and-from link transmission time delay in 65 km optical-fiber link,and make time transfer accuracy up to 108 ps.The main factor causing time delay fluctuation is optical fiber refractive index variation caused by temperature variation.This paper analyzes and simulates the relationship of temperature variation and optical-fiber time delay.The temperature test results show that the temperature drift coefficient of opticalfiber time delay varying with temperature accords with theoretical value.