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博碩士論文 etd-0711105-105919 詳細資訊
Title page for etd-0711105-105919
論文名稱
Title
超高功率雷射二極體與光纖之耦光
Coupling between Ultra High-Power Laser Diodes and Fibers
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
65
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2005-06-20
繳交日期
Date of Submission
2005-07-11
關鍵字
Keywords
光纖光柵、模態轉換、超高功率雷射、外部共振腔
ultra high-power laser, mode conversion, fiber grating, external cavity
統計
Statistics
本論文已被瀏覽 5656 次,被下載 3988
The thesis/dissertation has been browsed 5656 times, has been downloaded 3988 times.
中文摘要
超高功率雷射二極體,其發光區寬度大於50μm,約一般雷射二極體20倍以上,其輸出功率超過數瓦特。當多模態超高功率雷射二極體與摻鉺光纖(EDF)核心直徑約4~6μm之單模光纖,進行耦光時,因兩者的模場與模態不匹配,因此耦光效率相當低。
本篇論文提出一種提高耦光效率的架構,此架構是將單模光纖前端接上一段漸變折射率光纖(GIF),利用GIF聚焦的特性,當做透鏡使用,及同時在GIF前端製作楔型透鏡提高耦光效率並在單模光纖中置入光纖光柵(FBG)形成外部共振腔雷射(External Cavity Laser),使雷射模態從多模轉換為單摸,透過近場量測(NFP)已得到GIF最佳長度為400μm,將雷射發光功率操作在100mW下,楔型透鏡與超高功率雷射二極體之耦合效率為5%,其單模光纖輸出功率為5mW。目前本論文高功率雷射二極體與單模光纖耦光效率偏低,進一步降低元件間損失及提升耦光效率的工作仍在進行中。
Abstract
The width of an ultra high-power laser diode is greater than 50 μm and more than 20 times of low-power laser diode.The core diameter of Erbium Doped Fiber Amplifier fiber (EDFA) is 4~6 μm and it is a single-mode fiber (SMF).However,the ultra high-power laser diode is multi-mode laser. Therefore,the mismatch between high-power laser and SMF resulting in low coupling efficiency.
We improve coupling efficiency by using a wedge-shaped graded-index fiber (GIF) tip spliced to a SMF then fused a fiber bragg grating (FBG) to form an external cavity laser. The GIF is a focusing action like a graded-index fiber. From near-field pattern (NFP),we find the best GIF length is 400 μm. The coupling efficiency between ultra high-power laser diode and wedge-shape lensed fiber is only 5% .
目次 Table of Contents
中文摘要 Ⅰ
英文摘要 Ⅱ
致謝 Ⅲ
內容目錄 Ⅳ
圖表目錄 Ⅶ
第一章 緒論 1
1-1 研究背景 1
1-2 研究目的 2
1-3 論文架構 3
第二章 模態轉換理論 6
2-1 光纖的分類 6
2-2 理論基礎 7
2-2-1 高斯光束與模態耦合理論 7
2-2-2 楔型光纖透鏡 9
2-3 光纖光柵外部回饋 10
2-3-1光纖光柵理論 10
2-3-2 外部回饋 11
第三章 楔型光纖透鏡的製作 21
3-1 光纖熔接 21
3-1-1 融接機參數設定 21
3-2 光纖切割 22
3-3 光纖研磨系統 23
3-3-1 楔型光纖透鏡之製程 23
3-3-2 楔型光纖研磨參數設定 24
3-3-3 楔型光纖的研製 25
3-4 楔型光纖研磨結果 26
第四章 超高功率雷射二極體與光纖耦光的量測 35
4-1 元件特性 35
4-1-1 超高功率雷射二極體 35
4-1-2 980nm單模光纖 35
4-2 模場量測 36
4-2-1 模場量測 36
4-2-2 模場與多模光纖長度 37
4-3 耦光效率量測 38
4-3-1 實驗架構 38
4-3-2 量測結果 39
第五章 結論及未來工作
5-1 結論 52
5-2 未來工作 52
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