在保持正六角晶格不变的条件下，通过改变纤芯附近多个圆形微孔的直径大小，在多孔光纤截面中引入三种非对称结构, 利用正负双折射相互补偿来调控并扩大双折射率随波长变化的线性区间。采用全矢量波束传播法并考虑熔融石英的材料色散，计算分析了不同结构参数对偏振拍长色散曲线的影响。考虑到工艺制作的可行性, 通过优化结构参数，在同时覆盖1310 nm和1550 nm波长窗口的超宽带范围内获得了偏振拍长约为9 cm的平坦色散曲线，在1250~1650 nm波长范围内，拍长相对变化率小于0.15%；在1000~1900 nm波长范围内，相对变化率小于0.85%。这种光纤适合制作宽带光纤波片，用于光纤传感器中提高系统的稳定性和可靠性。

Three asymmetric structures are introduced into cross-section of holey fiber by changing the size of diameters of micro holes near the fiber core while maintaining the hexagonal lattice. The linear variation of birefringence over wavelength is controlled and expanded by the compensation between the positive and negative ones. Full-wave beam-propagation-method is used to calculate influence of different structural parameters on the beat-length dispersion, including the material dispersion of fused silica. Considering the permission of fabrication art, flat dispersion curve of beat-length about 9 cm is obtained by parameters′ optimization in super-wide band covering both 1310 nm and 1550 nm wavelength windows commonly used in the optical telecommunications. The relative change of beat-length is less than 0.15% in 1250~1650 nm band, and 0.85% in 1000~1900 nm. This optimal fiber is suitable for making wideband fiber-optic wave-plate used in fiber sensors to promote the systematic stability and liability.