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利用多极法对一种新颖结构的双层芯光子晶体光纤的色散特性进行了数值模拟,找出色散随结构变化的规律。通过合理选取其外层芯的层数,同时优化孔间距和空气孔直径,设计出可用于L波段进行宽带色散补偿的光子晶体光纤,此光纤色散值在-310~-260 ps/(km.nm)之间近似线性变化,残余有效色散系数近似为零,相关色散斜率(RDS)在0.0032 nm-1的色散补偿光纤,其RDS值与标准单模光纤匹配,有效模场面积优于常规色散补偿光纤,可以对宽带传输的标准单模光纤实现良好的色散补偿。
The multi-pole method was used to simulate the dispersion of a new type of double-core photonic crystal fiber and to find out the regularity of the variation of dispersion with the structure. By reasonably choosing the number of layers of the outer core and optimizing the spacing of the holes and the diameter of the air holes, a photonic crystal fiber for wideband dispersion compensation in the L band is designed. The dispersion value of the fiber is -310 ~ -260 ps / (km. nm), the residual effective dispersion coefficient is approximately zero, and the dispersion-compensated fiber with a correlated dispersion slope (RDS) of 0.0032 nm-1 has an RDS value that matches that of a standard single-mode fiber. The effective mode field area is better than the conventional dispersion Compensating optical fibers enables good dispersion compensation of standard single mode optical fibers for broadband transmission.