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研究生:柯俊豪
研究生(外文):Chun-Hao Ke
論文名稱:以長週期光纖光柵實現光放大器之增益平坦化濾波器
論文名稱(外文):Gain Flattening Design For Optical Fiber Amplifier By Long-Period Fiber Gratings
指導教授:吳宗霖吳宗霖引用關係
指導教授(外文):Tzong-Lin Wu
學位類別:碩士
校院名稱:國立中山大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:85
中文關鍵詞:增益平坦化濾波器耦合模態理論長週期光纖光柵
外文關鍵詞:coupled-mode theorygain flattening filterlong period fiber grating
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使用長週期光纖光柵作為光放大器增益平坦化濾波器的元件,就各種結構的長週期光纖光柵的頻譜探討,歸納出其頻譜特性作為設計時的參考依據。針對於不同增益平坦化濾波器的目標頻譜特性使用不同的光柵結構,其中光柵參數的使用基因演算法決定,最後提出了利用長週期光纖柵設計濾波器的流程,且歸納出設計長週期光纖光柵濾波器的心得。於本論文中,使用長週期光纖光柵對摻鉻釔鋁石榴石晶體光放大器(Cr:YAG optical amplifier),EDFA 光纖放大器(Erbium-
doped optical amplifier),的增益頻譜作增益平坦化;一者達成接近300nm 的頻寬,一者達成接近40nm 的頻寬。
Using Long-Period Fiber Gratings as component of Gain-Flattening filter ofOptical Amplifier, and discuss spectrum of different struture of Long-Period Fiber Gratings. To investigate the spectra characteristics of Long-Period fiber Gratings for designing reference resources. Aiming at different Gain-Flattening filter uses different struture of fiber grating, and the decision of parameter of fiber grating using Genetic Algorithm. Finally delcaring the dataflow of designing filter using Long-Period Fiber
Grating and conclusion.In this paper , gain flatttening Cr:YAG optical amplifier spectrum and Erbium-doped optical amplifier spectrum,one achieve 300nm bandwidth and
another achieve 40nm.
第一章序論....................... 1
1.1 研究背景與動機................... 1
1.2 長週期光纖光柵作為增益平坦化濾波器......... 1
1.3 光纖光柵的各種方法................. 1
1.4 論文大綱......................2
第二章光纖光柵的簡介及數學分析工具........... 6
2.1 光纖光柵的歷史簡介................. 6
2.2 光纖光柵的原理簡介................. 8
2.3 長週期光纖光柵的製作方式.............. 9
2.4 光柵的應用.....................10
2.5 Coupled Mode Theory................12
第三章長週期光纖光柵的模擬與討論............19
3.1 前言........................19
3.2 長週期光纖光柵的數學模型..............19
3.3 推導長週期光纖光柵的close form solution......23
3.4 均勻長週期光纖光柵模擬結果與討論..........25
(A) dc n 和頻譜響應的關係
(B) ac n 和頻譜的關係
(C)光柵週期長度和頻譜的關係
(D)固定中心波長,改變耦合模態
(E)單一均勻光纖光柵長度和頻譜的關係
(F)cladding 的半徑大小和頻譜的觀係
3.5 Phase-shift long period fiber grating........33
3.6 Phase-Shift Long-Period Fiber Grating 的模擬結果及討論....35
3.7 結論.......................37
第四章基因演算法...................39
4.1 基因演算法簡介..................39
4.2 基因演算法於數值的描述方式............39
4.3 基因演算法....................39
4.4 基因演算法的資料結構...............43
4.5 驗證基因演算法..................45
4.6 結論.......................47
第五章光放大器的增益平坦化設計............49
5.1 前言.......................49
5.2 增益平坦化濾波器的設計流程............49
5.3 Cr:YAG 光放大器的架構..............50
5.4 Cr-coped 光放大器的增益平坦化..........51
5.5 EDFA 光纖放大器(Erbium-doped fiber amplifier)的簡介.......62
5.6 EDFA 增益平坦化CASE 1..............63
5.7 EDFA 增益平坦化CASE 2..............68
第六章結論與未來工作................73
參考文獻
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