中文摘要：

建立了保偏光纤熔锥区截面的有限元模型，基于热-结构-电磁多物理场耦合有限元方法，分析了保偏光纤熔锥区的传输特性．给出了热应力导致的保偏光纤应力双折射及折射率变化曲线；分析了随着拉伸长度的增加，传输模式的转换以及传播常量的变化；分析了随着芯径的减小，应力区对电磁场分布的影响．

英文摘要：

The finite element model of fused-tapered of PMF is built. The propagation properties are analyzed according to heat transfer-structure mechanic-electromagnetics multiphysics coupling fields. The stress birefringence distribution and the refractive index curves of PANDA fibers are presented. The transition of propagation modes and the change of propagation constant are analyzed with increasing of the strength elongation. The influence of the stress applying parts （SAP） to the distribution of the electromagnetic field is studied with the reducing of fiber diameter.