四阶龙格库塔法求解波导模之间的模式耦合方程

In this paper, perturbation between two very close parallel cylindrical waveguides is researched, four-Runge - Kutta method is used for solving Mode-Coupled equations, get optical power distribution curves of the two waveguides, the results are in good agreement with the mode coupling theoretical caculated. Conclusions are made that the degree of coupling intensified with the increase of coupling coefficient, but weakened with the increase of propagation constants difference; the length of coupling coefficient decrease with the increase of coupling coefficient and propagation constants difference.