七芯光子晶体光纤结构优化的数值分析

Numerical analysis for structure optimization of seven-core photonic crystal fibers

从耦合模方程出发,推导了描述七芯光子晶体光纤模场特性的本征方程,得到了这种结构光纤的本征值和本征矢.使用频域有限差分法数值模拟,通过改变传输波长、纤芯间距、包层孔大小分析了纤芯之间的强度分布与耦合系数的关系,分别实现了模式整形和高阶超模截止.掌握了具有强耦合特性的七芯光子晶体光纤设计规律,和这种结构光子晶体光纤的同相位超模的选取方法.

The eigenvalue equation associated with seven-core photonic crystal fiber was derived from coupled-mode equation.Mode properties were analyzed by its eigenvalues and eigenvector.Using the frequency domain finite difference method,the relationship between fiber structure and coupling coefficient was fully discussed through changing the wavelength,hole pitch and core distance.Mode shaping and higher-order supermode cut off was realized.The results were helpful to the fiber structure design and in-phase supermode selection.