光纖與矽光子導線高效率耦合器之研究

Abstract

本篇論文介紹了許多最近以矽為基底的光子導線之發展。因此針對通訊波段，我們提出了一個緊密且高效能的光柵耦合器，可以將光纖內的訊號垂直打入，耦合至平面波導中。但問題在於光纖與光子導線的模態尺寸及形狀都差異過大。因此我們設計了一個長方形的傾斜光柵，並把它埋入高折射率的波導核心中。除此之外，為了防止光纖的訊號反射回光纖中，我們也將光纖稍微傾斜打入波導中並分析最後的耦合效能。我們使用模擬軟體R-Soft來模擬許多前人所提出來的各種方法，並將結果與本篇論文所提出的架構比較，最後我們將試著找出此架構的最佳解。

This thesis presents recent approaches in the development of a Si-based waveguides system for submicrometer devices. A compact and efficient grating coupler for tilt-incident with respect to the vertical axis coupling between optical fibers and silicon photonic wires is proposed. One of the drawbacks of the high index contrast is the large mismatch in mode size and shape between fibers and silicon photonic wires. Hence, a slanted grating with a parallelogram shape is designed through the entire high-index waveguide core. Otherwise, the optical fiber is slightly tilted in order to prevent a reflection and its coupling efficiency will be analyzed. We use R-Soft to simulate various approaches and compare them with slanted grating, and finally we try to find the best solutions.