本論文提出並以模擬驗證一極化無關之光方向耦合器，透過變換不同流體折射率之方式，使其隙縫式光波導之兩偏振態之耦合長度一致，達一極化無關之元件效果；另一方面，探討其耦合長度曲線，進一步設計一極化分光器，並可通過有無流體之選擇，達一近極化無關耦合器與一極化分光器之切換。
再者，將其光纖耦合器與光方向耦合器設計於同一積體晶片上，並採用雙層錐形脊狀之結構，達水平與垂直方向之漸變耦合。

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