5.1 結論
本研究提出之新型非軸對稱橢圓錐光纖透鏡架構，能以一次研磨 之製程，將光纖端面研磨成橢圓錐型，再利用電弧放電熔燒可形成非 軸對稱橢圓錐光纖透鏡。此研製方式之製程簡單，且由研磨及熔燒過 程可有效的控制橢圓錐光纖透鏡在兩個軸向上的透鏡曲率半徑。
目前實驗已證實，以模場直徑為 4µm 之單模光纖，以最佳化單 一製程研製並分析 30 個非軸對稱橢圓錐光纖透鏡之成品，所得之平 均軸心偏移量為 0.4µm，平均耦光效率達 71%，而最佳耦光效率可達 83%。本研究成果耦光效率超過 70%之良率為 47%，而耦光效率超過 60%之良率幾乎 100%。
其最大的優點在於簡化了繁瑣的非軸對稱式光纖研磨步驟，而提 高了製程之重複性及良率，並減少了加工時間與成本，且大幅減少了 透鏡中心與光纖中心之偏心程度，相較於過去研磨非軸對稱光纖透鏡 之製造方式，較利於在商業上生產用於 980nm 幫浦雷射模組之非軸 對稱橢圓光纖透鏡。
5.2 未來工作
本論文中所提出之一次研磨成型非軸對稱橢圓錐光纖透鏡之製 程，係利用在光纖夾具上加裝一旋轉之偏心配重塊，藉此產生週期性 變動扭矩，並且同步帶動光纖的自轉運動，因此其扭矩之變動為固定 的形式。本實驗室仍繼續與中山大學機電系蔡穎堅教授合作，現已開 發出能以電控方式控制變動扭矩之週期與大小，而能將光纖研磨出各 種形狀的錐式端面，在非軸對稱橢圓錐光纖透鏡的研製上也能更有效 的控制其形狀，而更精確地研製光纖透鏡，以達到針對不同長寬比之 雷射，研製出不同長寬比之非軸對稱橢圓錐光纖透鏡。
在耦光理論模型的建立上，應該更進一步的利用如光束傳播法 (Beam Propagation Method, BPM)等方式，建立更完整的光學模型，用 以算出不同的光纖透鏡遠場之波前及場型。並藉著實際量測雷射遠場 來了解並比較兩者的光學特性，以找出最佳的光纖透鏡結構參數，依 此設計並實際地研製光纖透鏡，並且與實際的耦光量測結果相結合，
使得理論上的分析更完備。
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