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研究生:鄭耀齡
研究生(外文):Yao-Ling Cheng
論文名稱:脈衝延遲時間可調的主動與重建式鎖模摻鉺光纖雷射系統
論文名稱(外文):Delay-Time-Tunable Actively and Regeneratively Mode-Locked Erbium-Doped Fiber Lasers
指導教授:林恭如
指導教授(外文):Gong-Ru Lin
學位類別:碩士
校院名稱:大同大學
系所名稱:光電工程研究所
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:2001
畢業學年度:89
語文別:英文
論文頁數:57
中文關鍵詞:鎖相迴路相移器延遲鎖定迴路鎖模摻鉺光纖環腔雷射
外文關鍵詞:phase-locked loop phase shifterdelay-locked loopmode-locked erbium-doped fiber ring laser
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我們藉著使用電壓控制式的鎖相迴路相移器(phase-locked loop phase shifter; PLL-PS)製作出一種延遲時間可調的主動式諧波鎖模摻鉺光纖環腔雷射。在實驗中,我們將電壓控制在-3.35 volts到3.6volts 之間,此時500 MHz(脈衝重覆率為500 MHz)光脈衝序列的相位變化以及延遲時間分別對應是340以及1.9 ns(接近一個週期),而換算得到的可調響應度(tuning responsivity)是0.27 ps/mV。另外,我們也建構出一套脈衝延遲可調、重建式的鎖模摻鉺光纖(RML-EDF)環腔雷射系統。我們探討RML-EDF環腔雷射系統內光脈衝寬度、光譜寬度、以及相位雜訊等特性。最後,我們將脈衝延遲時基可調的RML-EDF環腔雷射系統以及主動式諧波鎖模光纖環腔雷射系統的輸出特性比較。

In this thesis we demonstrate for the first time a delay-time tunable, actively and regenerately mode-locked erbium-doped fiber ring laser (ML-EDFL). Such a new class of ML-EDFL systems are integrated by using a typical ML-EDFL set and a frequency-translated delay-locked loop (DLL). The theoretical and experimental analysis of a new type of broad-band microwave phase shifter implemented by using frequency-translated DLL and frequency prescalers are demonstrated. By adding a continuously tunable offset voltage prior to the loop filter (LF) in a phase-locked loop (PLL), a novel DLL for accurate control of the phase of microwave signals generated from frequency-locked VCO can be achieved. By changing the voltage from —3.35 volts to 3.6 volts of the DLL, the maximum tuning range of the phase and the delay-time of optical pulse-train generated from actively ML-EDFL system repeated at 500 MHz can be up to 340º and 1.9ns (nearly 1 period) respectively under a tuning responsivity of 0.27 ps/mV. The regeneratively ML-EDFL with pulsewidth and spectral width, and delay-time tuning range of 58 ps, 0.16 nm, and 1.9 ns respectively are reported.

Abstract (in Chinese)..........................................i
Abstract (in English).........................................ii
Acknowledgment...............................................iii
Content.......................................................iv
List of Figures...............................................vi
Chapter 1 Introduction.........................................1
1.1 Erbium-doped Fiber lasers (EDFLs)..........................1
1.2 Mode-locked EDFLs..........................................3
1.2.1 Physics of mode-locking..................................3
1.2.2 Active Mode Locking......................................6
1.2.3 AM and FM Mode Locking...................................7
1.2.4 Harmonic Mode Locking....................................9
1.3 References................................................10
Chapter 2 Microwave Phase Shifter Based on Frequency Translated Delay-Locked Loop.............................................15
2.1 Abstract..................................................15
2.2 Introduction..............................................15
2.3 System analysis...........................................17
2.4 Experimental results......................................19
2.5 Conclusions...............................................23
2.6 References................................................24
Chapter 3 A Delay-Time Tunable Harmonically Mode-Locked
Erbium-Doped Fiber Ring Laser System..........................30
3.1 Abstract..................................................30
3.2 Introduction..............................................30
3.3 Experimental setup........................................32
3.4 Results and discussions...................................35
3.5 Conclusions...............................................37
3.6 References................................................38
Chapter 4 Delay-Time-Tunable Regeneratively Mode-Locked
Erbium-Doped Fiber Laser......................................43
4.1 Abstract..................................................43
4.2 Introduction..............................................43
4.3 Experimental setup........................................44
4.4 Results and discussions...................................46
4.5 Conclusions...............................................48
4.6 References................................................49
Chapter 5 Conclusion and future directions....................55

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