为了制作宽带稳定的光纤偏振器件，提出了一种改善双折射多孔光纤偏振拍长色散特性的方案。将具有圆孔包层阵列和芯边一对大圆孔的双折射多孔光纤，分别在两个正交方向上进行横向压缩或伸展，利用多种非对称结构产生的符号相反的双折射色散曲线进行平衡补偿，消除偏振拍长的波长敏感性。采用全矢量波束传播法计算分析了不同参数变化对模式双折射的影响，通过优化结构参数，在1550 nm波长窗口获得了中心拍长值约为39.5 mm的平坦拍长色散曲线，在1380~1750 nm波长范围内, 拍长值相对变化率约为1.27%。若用这种光纤制成1550 nm波长窗口的零级1/4波片，以2π/300作为带宽容限，则工作波段约为1400～1710 nm范围，相对带宽可达20%。

In order to produce fiber-optic polarization components and devices, a simple scheme is proposed for a birefringence holey fiber to improve dispersion characteristics of its polarization beat-length. The cross-section of the birefringence holey fiber with circular micro-holes cladding array and a pair of large holes near the cores is squeezed or expanded in orthogonal directions. To deduce the wavelength sensitivity of polarization beat-length, compensation and equilibrium are made among the birefringence dispersion curves with opposite signs induced by multiple asymmetric structures. The influence of different structural parameters on the modal birefringence is calculated and analyzed through full wave beam propagation method. By optimization to the structural parameters, a flatten dispersion curve of polarization beat length is obtained in 1550 nm wavelength windows with the central beat-length value around 39.5 mm. The relative variation of beat-length is 1.27% in wavelength range 1380~1750 nm. If this fiber is made into zero-order quarter wave plate in 1550 nm wavelength window, the operation wavelength band is about 1400~1710 nm under the retardation tolerance of 2π/300 and the relative bandwidth is up to 20%.