Improvement on optical fiber delay lines precision based on tunable laser

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.