提出了单轴各向异性材料为内包层 ,且其主轴沿光纤轴线 (z轴 )方向的双包层光纤模型 ,推出了矢量模特征方程。重点研究了主轴折射率比kcl对波导色散的影响 ,针对从矢量模特征方程求解波导色散因表达式极为复杂而无法直接求解的困难 ,提出了一种求解波导色散的有效方法。研究结果发现可以在不改变光波导结构参量的条件下 ,通过改变kcl可有效地改变光纤的波导色散。也分析了kcl、几何参量S、光学参量R对低次模的传输和截止特性的影响。研究结果为获得更为理想的色散补偿、色散平坦光纤及设计新型无源光器件提供了重要的依据 The double-clad fiber model with uniaxial anisotropic material as the inner cladding and the major axis along the axis of the fiber (z-axis) is proposed. The vector mode characteristic equation is derived. Focusing on the influence of the main axis refractive index ratio kcl on the waveguide dispersion, aiming at the difficulty of solving the waveguide dispersion from the vector mode characteristic equation because the expression is extremely complicated and can not be directly solved, an effective method to solve the waveguide dispersion is proposed. The results show that the waveguide dispersion can be effectively changed by changing kcl without changing the structure parameters of the optical waveguide. The effects of kcl, geometric parameters S and optical parameters R on the transmission and cut-off characteristics of low-order modes are also analyzed. The results provide an important basis for obtaining better dispersion compensation, dispersion flattened fiber and designing new passive optical devices