为了提高一种3bit可变光纤延迟线的延时精度，提出一种采用可调谐激光器作为系统光源的技术，利用光纤的材料色散特性即光纤的折射率随传输波长变化而改变的特点，来改变延时光纤中信号存储的时间，从而达到提高光纤延迟线延时精度的目的。仿真结果表明，采用该种技术的光纤延迟线系统，平均延时误差从4．1ps下降到了1．3ps，延时精度得到了显著提高。

In order to improve the precision of a 3bit variable optical fiber delay line,a new technology using a tunable laser as the lighting source of the delay system is proposed based on the characteristics of optical fiber's material dispersion that the refraction index of optical fiber changes along with the difference of transmitting wavelength. At the same time,the period of optical signal storage in delay lines is also altered and the delay precision of optical fiber delay lines is improved. The simulation results indicate the mean delay error decreases from 4.1ps to 1.3ps,and the delay precision of the 3bit optical fiber delay line is remarkably improved by using this new technology.