透鏡光纖的光學模型與耦合效率之研究

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姓名

李宗憲(Tsung-Xian Lee) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

透鏡光纖的光學模型與耦合效率之研究
(The Study of Optical Modeling and Coupling Efficiency for Lensed-Fiber)

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摘要(中)

本論文成功地建立了透鏡光纖的光學模型並提出新架構的透鏡光纖可用在雷射光與單模光纖的光學耦合上。在論文中，首先分別討論了雷射二極體和單模光纖的光學特性與其橫向模態的計算。其次，在理論分析方面，我們利用了近軸高斯光束傳輸來模擬透鏡光纖在自由空間中的模態分佈，並且使用Fresnel繞射來修正離軸效應所產生的誤差。我們由以上的理論計算分析了幾款透鏡光纖，包含其耦合效率和對光容忍度的分析，最後提出新的透鏡光纖架構，二段式透鏡光纖，其工作距離大於100微米，且耦合效率達50%以上。

摘要(英)

A new lensed-fiber with two different rods of a spherical end is proposed. The lens geometry and
refractive index are changed to obtain various working distance and spot size. We analyze the characteristic of lensed-fiber, and demonstrate a lensed-fiber with high coupling efficiency of around 50% and with working distance longer than 100um.

關鍵字(中)

★ 耦合效率
★ 透鏡光纖

關鍵字(英)

★ Coupling Efficiency
★ Lensed-Fiber

論文目次

第一章緒論…………………………………………………………. 1
1.1 光纖耦合技術...…………………………………………….. 1
1.2 透鏡光纖的發展與耦合特性….………………...…………. 3
1.3 透鏡光纖的模擬方法………………………………………. 6
1.4 論文大綱與架構……………….…………………………… 8
第二章耦光元件特性........................................................................ 9
2.1 雷射二極體特性………………………..…………………... 9
2.1.1 基本構造…………...………………………………..…. 9
2.1.2 矩形波導模態……………………………………..…… 13
2.1.3 雷射光束之空間分佈特性………………………..…… 20
2.2 光纖特性……………..……………………………………... 23
2.2.1 圓柱形波導模態………………………………………. 24
2.2.2 單模光纖特性…..……………………………………… 28
第三章理論計算….…………………………………………………. 31
3.1 高斯光束傳輸……………………………………………....... 31
3.1.1 高斯光束之基本特性…………………………………… 31
3.1.2 近軸高斯光束傳輸……………………………………… 35
3.2 Fresnel 繞射………..………………………………………….. 36
3.3 耦合效率分析………………………………………………... 39
第四章透鏡光纖的模擬與分析.…………..……………..………… 44
4.1 光學模型建立………..………………………………………. 44
4.2 薄透鏡光纖分析……………………………………………... 47
4.3 厚透鏡光纖分析…………...………………………………… 54
4.4 二段式透鏡光纖……………………………………………... 61
4.5 耦合效率分析........................................................................... 65
第五章結論…………………………………………………………. 72
參考文獻……………………………………………………………... 74
中英文名詞對照表…………………………………………………... 77

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指導教授

孫慶成(Ching-Cherng Sun)

審核日期

2003-7-17

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