The optimal design of an N x N coupler of multimode interference (MMI) type is considered. The geometrical structure of the whole N x N coupler can be determined effectively by three parameters when the width of the MMI section is given, A genetic algorithm is used to determine these three parameters to achieve good results for the uniformity and excess loss. The optimal design is verified by a numerical simulation using the beam propagation method. Compared with the conventional design based on the self-image theory, the present method improves the uniformity and excess loss greatly. (C) 2002 Elsevier Science B.V, All rights reserved. [References: 10]
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机译：考虑了多模干扰（MMI）类型的N x N耦合器的最佳设计。当给出MMI截面的宽度时，可以通过三个参数有效地确定整个N x N耦合器的几何结构。使用遗传算法确定这三个参数，以实现均匀性和超额损耗的良好结果。通过使用束传播方法的数值模拟验证了最佳设计。与基于自我图像理论的常规设计相比，本发明的方法大大提高了均匀性和过度损耗。 （C）2002 Elsevier Science B.V，保留所有权利。 [参考：10]
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