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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.
Based on coupled mode equations, the eigenvalue of the mode field characteristics of a seven-core photonic crystal fiber is deduced, and the eigenvalues and eigenvectors of the structured fiber are derived. By using the finite difference method in frequency domain, Fiber core spacing and cladding hole size, the relationship between the intensity distribution and the coupling coefficient of the core is analyzed, and the mode shaping and the high-order supermode cut-off are respectively implemented. The design rule of the seven core photonic crystal fiber with strong coupling characteristics is mastered, Selection of in - phase supermodules of structured photonic crystal fibers.