用等效矩形波导近似研究双模椭圆芯光纤的特性

Propagation characteristics of dual mode elliptical core fibers by an equivalent rectagular waveguide method

用等效矩形波导近似，结合一级微扰理论，研究了双模椭圆芯光纤的传播特性，得到了双模运行的Ｖ值范围和Ｅｘ２１模与Ｅｘ１１模之间的双折射。

By using an equivalent rectagular waveguide method, incorporating first order perturbation theory, propagation characteristics of dual mode elliptical core fibers are studied V value of the dual mode region, variation of birefringence and group index difference between E x 21 modes and E x 11 modes as a function of normalized frequency V for different values of the aspect ratio a/b are obtained.