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研究生:賴長良
研究生(外文):Chang-Liang Lai
論文名稱:長波段波長可調光纖雷射之參數優化及研製
論文名稱(外文):The Optimum Investigation of L-band Tunable Linear-Cavity Erbium-Doped Fiber Laser (EDFL)
指導教授:廖顯奎
指導教授(外文):S.-K. Liaw
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電子工程系
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:2008
畢業學年度:96
語文別:中文
論文頁數:88
中文關鍵詞:光纖光柵自發性輻射掺鉺光纖優化反射率波長可調光纖光柵波長可調光纖雷射
外文關鍵詞:fiber Bragg gratingFBGASEAmplified Spontaneous Emissionerbium doped fiberEDFoptimumreflectivitytunable FBGtunable fiber laser
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本論文主旨為優化線性型光纖雷射,首先簡介掺鉺光纖雷射的原理。本論文將利用模擬與實驗來得到線性型掺鉺光纖雷射的最佳參數。。由於Fibercoer公司所公開的掺鉺光纖參數中,但掺鉺光纖之飽和參數為其重要的參數卻未公開。因此本論文間接得到飽合參數為 。利用數學方程式來進行模擬為目前大多數所採用的方法,但利用數學方程式只能得到最後雷射輸出結果,並不能知道光訊號在共振腔內所產生的變化。因此利用Optisystem 6.0來解釋動作原理,並利用圖示更加淺顯易懂。線性型光纖雷射分為前向式架構與後向式架構,接著進而比較此兩種的優劣。前向架構與後向架構的掺鉺光纖長度皆為5m、泵激光源皆為100mW、光纖光柵之反射率皆為50%時,後向式架構的斜線效率為20%;臨界功率為4.5mW;雷射輸出功率為19mW。其特性後向式架構接優於前向式架構。線性型掺鉺光纖的架構種類繁多,因此再跟著介紹線性型掺鉺光纖雷射的演化,從傳統型雙光纖光柵到最後本論文所採用的含BFm與光纖光柵之後向式線性型掺鉺光纖雷射。由實驗與模擬得知掺鉺光纖長度最佳為5m至8m,光纖光柵之反射率最佳為17.5~25%。掺鉺光纖長度為5m與光纖光柵之反射率為20%時,波長為1582nm的斜線效率為33%;臨界功率為4.9mW;雷射輸出功率為30mW,波長為1596nm的斜線效率為25.1%;臨界功率為6mW;雷射輸出功率為23.6mW。後向式線性型掺鉺光纖雷射要擴展至波長可調之掺鉺光纖雷射時,雖然掺鉺光纖長度選擇使用最佳之長度,但光纖光柵之反射率卻是選擇50%,並非選擇最佳之反射率。此因為波長可調的範圍會受光纖光柵之反射率影響。反射率為20%時,波長可調範圍為6nm;反射率為50%時,波長可調範圍為13nm。因此若要波長可調範圍為較大時,則反射率需選擇50%。
The thesis investigates the optimization of linear-cavity erbium-doped fiber laser (EDFL) both in simulation and experiment. The thesis also discusses several parameters which usually not be released by Fiber developed companies likes Fibercore© and so on. The simulation tool here is Optisystem 6.0 and the saturation parameter we suggested is . Based on the mathematical formula, the final output power could be obtained and the light intensity along the cavity could be tracked after parameters are setted. Hereafter, experimentally study the EDFL both in forward pumping and backward pumping schemes are investigated. The length of gain fiber, the pump laser, reflectivity of the fiber Bragg grating (FBG) are 6 M, 100 mW and 50%, respectively. We conclude that the backward pump EDFL has better charactersitics in threshold power and lasing output power than those of the forward pump EDFL. Based on the experimental and simulated results, the most suitable length of EDF is suggested to be 5 to 8m, and the optimum reflectivity of FBG is around 21%. Using a FBG with a center wavelength of 1582 nm, as well as 5M EDF and FBG of 20% reflectivity, a slope efficiency of 33% in 4.9mW threshold power and 30mW laser output power are achieved. Using a FBG with a center wavelength of 1596 nm, the values of them will be 25.1%, 6 mW and 23.6 mW, respectivwly. The fixed-wavelength EDFL structure could be extended into a tunable-type EDFL in the same EDF length while the optimum reflectivity of tunable FBG will be changed to around 50% under the consideration of the extending of tunable range of FBG. For example, the allowable wavelength tunable range are 6nm and 13nm when the reflectivities of FBGs are 20% and 50%, respectively.
摘要
Abstract
圖表索引
目錄
目錄
第一章 緒論
1.1 前言
1.2 研究動機
1.3 論文架構
第二章 掺鉺光纖雷射
2.1 摻鉺光纖雷射之三階鉺離子速率方程式
2.2 自發性輻射(Amplified Spontaneous Emission, ASE)
2.2.1 寬頻譜光源介紹
2.2.2 前向(Forward)ASE與背向(Backward)ASE
2.2.3 掺鉺光纖參數設定
2.3 掺鉺光纖雷射理論分析
第三章 L Band線性型摻鉺光纖雷射
3.1 前向式線性型掺鉺光纖雷射(Forward EDFL)
3.1.1 動作原理
3.1.2 實際量測
3.2 後向式線性型掺鉺光纖雷射(Backward EDFL)
3.2.1 動作原理
3.2.2 實際量測
3.3 前向式與後向式線性型掺鉺光纖雷射比較
3.3.1 Forward ASE & Backward ASE之比較
3.3.2 泵激光源再次利用
3.4 本章小結
第四章 後向式線性型光纖雷射之優化
4.1 優化之重要性
4.2 線性型光纖雷射之演化
4.2.1 傳統雙光纖光柵架構(Double-FBG EDFL,D-G EDFL)
4.2.2 含光循環器與光纖光柵架構(Circulator-FBG EDFL, C-G EDFL)
4.2.3 含BFM與光纖光柵架構(BFM-FBG EDFL, B-G EDFL)
4.3 掺鉺光纖長度優化
4.3.1 掺鉺光纖長度量測
4.3.2 探討掺鉺光纖長度與ASE之關係
4.3.3 Backward EDFL之ASE討論
4.3.4 掺鉺光纖長度優化
4.4 光纖光柵反射率優化
4.5 本章小結
第五章 波長可調之掺鉺光纖雷射
5.1 可調波長之光纖光柵機制
5.1.1 簡介
5.1.2 波長可調之光纖光柵理論
5.2 可調波長之掺鉺光纖雷射
5.3 不同反射率之漂移量
5.4 不同反射率之討論
5.5 本章小結
第六章 結論與未來展望
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