设计了一种折射率引导型双芯准晶格光子晶体光纤，并基于有限元法对其色散特性进行数值模拟和研究。该光纤内、外纤芯中光波的耦合效应，可在相位匹配波长附近产生相当高的负色散值。通过分析内包层孔径d1，外纤芯孔径d2，外包层孔径d3，孔间距Λ以及内包层空气孔层数的改变对光纤色散特性的影响，最终设计出一种在1550 nm低损耗窗口性能优越的色散补偿光纤，负色散峰值为-2250 ps /(nm·km)，半峰全宽超过280 nm，色散-带宽乘积可达630 GHz-1·km-1。此种光纤适合在长距离高速光纤通信系统中为常规单模光纤提供色散补偿。

An index-guiding dual-core photonic crystal fiber with quasi-lattice is designed, and its dispersion properties are simulated numerically by the finite element method. The coupling between inner-core mode and outer-core mode of proposed fiber will lead to a highly negative dispersion value around phase matching wavelength. The effects of changing d1, d2, d3, Λ or the number of inner cladding air-hole rings on dispersion properties are investigated. At last, a dispersion compensation photonic crystal fiber at 1550 nm wavelength is designed, which has a peak dispersion value of -2250 ps /(nm·km) with a full-width at half-maximum exceeding 280 nm. Its dispersion-bandwidth product can reach 630 GHz-1·km-1. This fiber is suitable for dispersion compensation in long-distance high-speed optical fiber communication systems.