中文摘要：

在对W型阶跃双包层手性光纤进行解析求解的基础上,对几个低阶导模的功率特性进行了仔细的研究.对典型的内包层厚度,计算了几个低阶模留在纤芯中的光功率随纤芯和内外包层的手性参数的变化关系曲线,讨论了纤芯和内外包层的手性参量以及内包层厚度对不同符号模式的功率特性的影响.内包层厚度越大,功率越被限制在纤芯中.随着纤芯中手性参量的增大,HE-11模和HE-21模（HE01模）限制在纤芯中的光功率缓慢增加,而HE11模和HE21模（HE02模）限制在纤芯中的光功率则逐渐减小.包层手性参量的作用正好与此相反.

英文摘要：

Based on the analysis solution of a W-type double-cladding chiral optical fiber, the optical power characteristics of several lower-order guided modes have been investigated. The optical power in the core as a function of chirality parameters in the core, the inner and outer claddings is calculated for different inner cladding thickness. The effect of chirality parameters on the optical power in the core for guided modes with different index signs is discussed. Thicker inner cladding results in larger optical power in the core. With increasing the chirality parameter in the core, the optical power of HE-11 mode and HE-21 mode （HE01 mode） in the core increase slowly, but the power of HE11 mode and HE21 mode （HE02 mode） in the core decrease gradually. The effect of the chirality parameter in the cladding is reversed with that in the core.