Multimode interference ( mmi ) couplers based on the self - imaging effect are rapidly getting popular because of the advantage of low loss , compact size and large fabrication tolerance . the thesis studied the principle of the mmi coupler . the optical field distribution in the multimode wave - guide is modeled by eim and mode propagation analysis method ( mpa ) 本文介紹了矩形多模干涉耦合器的基本原理,采用有效折射率方法和導(dǎo)模傳輸分析方法模擬了多模波導(dǎo)中的光場分布,設(shè)計并模擬1 2 , 1 4對稱干涉型光功率分配器、 2 2配對干涉型光功率分配器,得到了比較均衡的功率輸出。