一种拥有超大负色散的双芯光子晶体光纤

Dual Core Photonic Crystal Fiber with Large Negative Dispersion

针对目前广泛使用的G.652光纤中存在的色散问题,设计了一种圆形结构的双芯色散补偿型光子晶体光纤,并运用COMSOL Multiphysics 4.4对其进行仿真模拟。研究表明,当空气孔孔径d增大时,色散的最小值会向长波长区移动,同时最小色散值的绝对值会逐渐增大;当层与层间距Λ增大时,色散的最小值会向长波长区移动,但是最小色散值的绝对值会逐渐减小;当填充液体折射率nL增大时,色散的最小值会向短波长区移动,同时最小色散值的绝对值会逐渐增大。当d=1.140μm,Λ=1.500μm,nL=1.350时,在传输波长1 550nm处可以得到大约-17 000ps/(nm·km)的大负色散值,可以对相当于自身长度850倍的G.652单模光纤进行色散补偿。

In order to solve the problem of dispersion in G.652,a dual core PCF with large negative dispersion was proposed.The results are that with the increase of air-hole diameter（d）,the minimum value of dispersion moves to long wavelength with an augment of the absolute value;with the increase of layer-tolayer spacing（Λ）,the minimum value of dispersion moves to long wavelength with a decrease of the absolute value and with the increase of refractive index of the infiltrating liquid（nL）,the minimum value of dispersion moves to short wavelength and the absolute value increases,which were obtained based on COMSOL Multiphysics 4.4.The results show a high negative dispersion of-17 000 ps/（nm·km）around 1 550 nm when d=1.140μm,Λ=1.500μm and nL=1.350,which means that the DCF length in1 meter can compensate the total dispersion of the G.652 length in 850 meters.