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研究生： 相偉龍
OLIVER - SEUNG
論文名稱： 長波段光纖雷射之研製
An investigation of L-band Fiber Laser
指導教授： 廖顯奎
Shien-Kuei Liaw
口試委員: 王立康
L.W.WANG
董正成
Jeng-Cherng Dung
徐世祥
Shih-Hsiang Hsu
學位類別： 碩士
Master
系所名稱： 電資學院 - 電子工程系
Department of Electronic and Computer Engineering
論文出版年： 2007
畢業學年度： 96
語文別： 英文
論文頁數： 90
中文關鍵詞： 光纖光柵 、光纖雷射 、長波段 、分波多工 、寬頻反射鏡
外文關鍵詞： fiber bragg grating, fiber laser, L-band, WDM, broad band mirror
相關次數： 點閱：197  下載：14 
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    • 本論文共分為三個部份：首先介紹光纖光柵之原理，製造及量測，感光光纖之選擇，最後包裝及溫度補償。接著是雷射和摻鉺光纖放大的原理，摻鉺光纖雷射理論的分析，最後實驗做出可調波長從1572nm-1602nm的光纖光柵，可覆蓋長波段。第二部份進入到L band線性光纖雷射的架構，從前後向光纖雷射的架構，使用100mW的泵激光源，波長1572 nm可以得到雷射輸出功率為7.28 mW，旁模抑制(SMSR)比為56 dB，轉換效率為7 %，從光頻譜分析儀測得3 dB線寬為0.05 nm。波長1581 nm可以得到雷射輸出功率為9.51 mW，旁模抑制(SMSR)比為59.8 dB，轉換效率為10 %，線寬為0.05 nm。第三部份介紹改善耦合光纖雷射架構，使用100mW的泵激光源，波長1596 nm可以得到雷射輸出功率分別為12.13mW，旁模抑制比為60.4 dB，轉換效率為14.1 %，3dB線寬均為0.05 nm。可以得知光纖雷射架構性能的優良性。未來將可結合以上光纖雷射架構作為光纖感測器, 高密度分波多工之光源，提高解調機制的正確性。

    This thesis aims to study the characteristic of L-band (1560-1610nm). Firstly we reviewed the theory of fiber bragg grating, fabrication, and demonstrated a tunable fiber laser of range from 1572nm to 1602nm that covers the entire L-band. Then the laser and EDF principals are reviewed as well. Secondly, various pumping power and three kinds of EDF lengths of three FBG wavelengths are experimented with in four laser cavity configurations. A fiber laser at 1572 nm with 7.28 mW output power is shown. It has an optical line width of 0.05nm, side mode suppression ratio (SMSR) of 56dB and power transfer efficiency of 7%. Another fiber laser with 9.51mW output power is shown with optical line width of 0.05 nm, SMSR of 59.8 at wavelength 1582nm and power transfer efficiency of 10%. Finally with the improvement of the coupling efficiency, the lasing output power becomes 12.13mW, SMSR is 60.4 dB, power transfer efficiency is 14.1%, and 3 dB bandwidth is 0.05nm at 1596nm. These results make this L-band fiber laser a good candidate for a wide variety of sensors and communication applications.

    Table of Contents English Abstract…………………………………………I Chinese Abstract…………………………………………II Acknowledgements…………………………………………III Contents…………………………………………IV List of Figures…………………………………………V List of Tables…………………………………………VIII List of Acronyms……………………………………………………IX Chapter 1 Overview 1-1 Introduction…………………………………………1 1-2 Motivation…………………………………………4 1-3 Organization of thesis…………………………………………5 Chapter 2 Fiber Bragg Grating 2-1 Basics…………………………………………7 2-2 Theory…………………………………………8 2-3 FBG Fabrication……………………………………………………13 2-4 Photo sensitive mechanism………………………………………15 2-5 Type of photo sensitive fiber……………………………………15 2-6 Measurement………………………………………………………17 2-7 Anneal …………………… ……………………………………19 2-8 Tunable FBG …………………………………………………21 2-9 Experimental setup……………………………………………21 2-10 Chapter discussion………………………………………………22 Chapter 3 Laser and EDF 3-1 Basics…………………………………………27 3-2 Absorption and emissions of lights by photons…………………………………………29 3-3 Creating a Population Inversionv31 3-4 Erdium doped fiber …………………………………………32 3-5 EDF theory…………………………………………34 3-6 Erdium doped fiber rate equation…………………………………………37 3-7 Fiber laser versus lasers…………………………………………39 3-8 L-band fiber laser…………………………………………41 Chapter 4 Linear cavity fiber laser experiment 4-1 L-band EDF theory…………………………………………43 4-2 Experimental setup …………………………………………45 4-3 Type I Linear cavity fiber laser forward pumping…………………………………………45 4-4 Effect of fiber length……………………………………………48 4-5 Effect of pump power…………………………………………48 4-6 Transfer Efficiency ……………………………………………50 4-7 Type II Linear cavity fiber laser backward pumping……………52 4-8 Effect of fiber length……………………………………………54 4-9 Effect of pump power…………………………………………56 4-10 Transfer Efficiency ……………………………………………57 Chapter 5 Linear cavity fiber laser experiment 5-1 Type III Fiber Laser Forward pump with C+L WDM.…………59 5-2 Effect of fiber length………………………………………………61 5-3 Effect of Pump power……………………………………………63 5-4 Transform efficiency………………………………………………63 5-5 Type IV Fiber Laser Backward pump with C+L WDM…………65 5-6 Effect of fiber length………………………………………………67 5-7 Effect of pump power…………………………………………69 5-8 Transfer Efficiency ………………………………………………69 5-9 WDM device measurement…………………………………………71 5-10 ASE analysis………………………………………………………73 5-11 Chapter Discussion………………………………………………78 Chapter 6 Conclusion 6-1 Summary …………………………………………81 6-2 Future work…………………………………………………………81 Reference………………………………………………………………83

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