臺灣博碩士論文加值系統

在此碩士論文中，我們將提出了兩種基於摻鉺光纖（Erbium–doped Fiber，EDF）的雷射系統架構。此研究目的都是為了抑制摻鉺光纖環形雷射所產生的多縱模（Multi-Longitudinal-Mode，MLM）現象，並使其達到穩定的單縱模（Single-Longitudinal-Mode，SLM）光輸出。在第一個研究上，我們利用光循環器（Optical Circulator，OC）、一個 2 m長的未泵浦 EDF和光纖反射鏡（Fiber Reflected Mirror，FRM）的搭配，用以形成一個具雷利背向散射（Rayleigh Backscattering，RB）反饋注入和同時具飽和吸收（Saturable Absorber，SA）濾波器的光纖雷射架構，使其具有連續性（Continuous-Wave，CW）波長可調輸出之性能，此RB反饋注入可用以縮小雷射線寬，而EDF-SA 產生的濾波器效應亦可抑制密集的MLM振盪，可導致穩定的SLM光波輸出。在第二部分，我們使用多光纖環（Multiple-Fiber-Ring，MFR）的方式使其產生SLM輸出的EDF雷射架構。於此我們將使用三個光耦合器（Optical Coupler，OCP）來設計出一個具有波長可調且穩定 SLM 輸出的四環摻鉺光纖雷射系統，四個光纖環將根據游標尺效應產生模態濾波器的應用以抑制與消除MLM拍頻振盪，此架構不僅可以緩解由較長的光纖長度和鉺離子的均勻展寬效應引起的多縱模效應，同時還可將波長可調範圍從C-波段延伸至部分的L-波段。

In this master’s thesis, we will investigate and study two erbium-doped fiber（EDF）based laser architectures. The two related studies of EDF based lasers are applied to reduce the multi-longitudinal-mode（MLM）phenomenon and also achieve a stable single-longitudinal-mode（SLM）output for tuning different wavelength continuously.
In the first study, we exploit an optical circulator（OC), a 2-m long unpumped EDF, and a fiber reflected mirror（FRM）to construct a fiber laser architecture with Rayleigh backscatter（RB）feedback injection for continuous-wave（CW）tunability. The mode-filter effect generated by EDF-SA also can suppress the dense MLM oscillations and achieve the stable SLM output.
In the second research, we design a multiple fiber ring（MFR）approach based on three optical couplers（OCPs）to cause a four-ring EDF laser for the adjustable wavelength and stable SLM output. The four rings can generate mode-filter behavior through the Vernier effect to decrease MLM oscillations fully. The demonstrated laser architecture not only mitigates the MLM caused by a longer fiber lengths and uniform spreading effect of Er+, but also spreads the tuning scope from C-band to partial L-band.

第一章 緒論 IX
1.1 研究動機及背景 1
1.2 單模光纖與多模光纖 2
1.3 光纖的衰減 4
1.4 摻鉺光纖放大器 6
1.5 自由頻譜範圍 8
第二章 文獻回顧 10
2.1 相關文獻（一） 10
2.2 相關文獻（二） 13
2.3 相關文獻（三） 16
2.4 相關文獻（四） 19
第三章 通過應用雷利反饋光和可飽和吸收濾波器的可調諧穩定單模光纖雷射 22
3.1 實驗介紹 22
3.2 實驗架構 24
3.3 實驗結果 27
第四章 基於多光纖環設計的單模可選波長摻鉺光纖雷射 34
4.1 實驗介紹 34
4.2 實驗架構 36
4.3 實驗結果 39
第五章 結論 47
參考文獻 49
圖片來源 54
個人著作列表 55

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