The variational problem related to the coupled vector wave equations and boundary conditions of circular dielectric waveguide with arbitrary refractive index profile is solved using the finite element method ( fem ) 應(yīng)用有限元方法求解了任意徑向非均勻折射率分布圓柱對稱介質(zhì)波導(dǎo)中縱向場耦合波動方程定解問題所對應(yīng)的變分問題,該方法不受弱導(dǎo)或高斯模場分布等限制。
By applying the boundary conditions and the orthogonality of spherical vector wave functions , an adequate number of relations between the unknown coefficients is generated . from all these discussions , the scattered fields and normalized scattering cross sections are computed 通過以上討論,即可建立起足夠多的決定各展開系數(shù)的方程,求出散射場系數(shù),進(jìn)而求出散射場及散射截面。