本研究主要探討橢圓錐狀透鏡光纖(Elliptic-conical lensed fiber)製程中，光纖端面結構與熔域大小對於透鏡曲率半徑與高功率980nm雷射二極體與單模光纖間耦光效率之影響。文中首先使用有限元素套裝軟體MARC模擬光纖在高溫爐中之熱傳行為，以自由對流方式加熱熔燒光纖尖端，並分析加熱時間與熔融區域的關係。達熔點時，光纖端面為最小表面能量之非對稱曲面，固化後於光纖尖端形成微透鏡結構，其表面曲率分布由數值分析軟體Surface Evolver預測。建構其耦光模型於光學設計軟體ZEMAX中模擬980nm雷射與橢圓錐狀透鏡的耦光效率，並配合田口方法探討不同端面參數與熔燒區域形成之微透鏡表面曲率對於模態匹配的改善，為增加耦光效率提供有效優化光纖製程參數的辦法。並評估雷射模組構裝中銲後位移造成對準失效之耦光損失。

A simulation scheme is proposed to analyze the effects of elliptic-conical lensed fiber parameters on the coupling efficiency between a 980nm laser diode and single-mode fiber(SMF). The variation of fiber tip shapes with different melting zone volumes was investigated in this thesis. The heat-transfer finite element model in MARC package is employed to simulate the temperature distribution during the melting process. The free convection is considered in predicting the melting zone. Due to the surface tension, a round tip may be solidificated. In this study an elliptical tip lens is expected to improve the coupling efficiency. The microlens shapes with different radius of curvature is simulated with the software of Surface Evolver. The coupling efficiency of 980nm laser source and different elliptic-conical lensed fiber is calculated by utilizing the ZEMAX optical analysis software. The Taguchi method is employed to evaluate the effect of tip shape parameters on the coupling efficiency. The optimal elliptic-conical lensed fiber parameters has also been proposed. The efficiency loss introduced from the misalignments in laser module packaging has also been discussed in this study.

目錄………………………………………………………………………... i
圖目錄……………………………………………………………………... iii
表目錄……………………………………………………………………... vi
符號說明…………………………………………………………………... vii
摘要………………………………………………………………………... xii
Abstract……………………………………………………………………. xiii
第一章 緒論………………………………………………………………. 1
1-1 前言………………………………………………………… 1
1-1-1 光纖通訊發展………………………………………. 1
1-1-2 光纖…………………………………………………. 2
1-1-1 光訊號放大技術發展及現況………………………. 3
1-2 研究動機…………………………………………………… 5
1-3 文獻回顧…………………………………………………… 6
1-4 組織與章節………………………………………………… 8
第二章 理論基礎與數值析………………………………………………. 19
2-1 雷射與雷射二極體………………………………………… 19
2-2 高斯光束…………………………………………………… 20
2-3 耦光理論模型……………………………………………… 21
2-4 數值分析…………………………………………………… 22
2-4-1 預熔區域分析………………………………………. 22
2-4-2 微透鏡形狀預測……………………………………. 23
2-4-3 耦光效率分析………………………………………. 26
第三章 橢圓錐狀光纖透鏡製程…………………………………………. 34
3-1 橢圓錐狀光纖……………………………………………… 34
3-1-1 光纖研磨機台………………………………………. 34
3-1-2 橢圓錐狀光纖端面成型原理………………………. 34
3-2 光纖熔燒與微透鏡成型之關係…………………………… 37
3-2-1電弧熔燒…………………………………………….. 37
3-2-2 高溫爐加熱方式之熱傳分析………………………. 37
第四章 橢圓錐狀光纖透鏡參數分析與討論……………………………. 56
4-1 橢圓錐狀光纖之幾何模型………………………………… 56
4-2 橢圓錐狀光纖透鏡參數優化……………………………… 56
4-3 耦光效率與曲率半徑分析………………………………… 59
4-3 耦光效率與曲率半徑分析………………………………… 62
第五章 結論………………………………………………………………. 87
5-1 結論………………………………………………………… 87
5-2 未來研究…………………………………………………… 88
參考文獻…………………………………………………………………... 89

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