本篇論文中，主要是設計一個能有效耦合光纖與矽通道波導的波導元件。透過directional couple的基本理論，設計一大小模態尺寸有極大差異的兩波導能有相近的neff，已獲得極高的耦合效率。
主要設計的想法是利用多層的SiN，在層與層之間成長低折射率的SiO2，藉此獲得一個大模態而低等效折射率的大尺寸波導，來耦合光纖光源，再設計一單層SiN其等效折射率能與這大尺寸的波導相近，即可把能量從多層的SiN耦合至單層的SiN，最後再設計一模態大小能與此單層SiN匹配的矽通道波導，來完成我們這個耦合元件的目的，即是將光纖的光源有效率的打入矽通道波導之中。

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