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研究生:曾志隆
研究生(外文):Chih-lung Tseng
論文名稱:摻鉺光纖雷射研製及其於光纖網路系統之應用
論文名稱(外文):Realization of Erbium-Doped Fiber Lasers and Their Applications to Optical Fiber Network Systems
指導教授:劉政光劉政光引用關係
指導教授(外文):Cheng-kuang Liu
學位類別:博士
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:2010
畢業學年度:98
語文別:英文
論文頁數:105
中文關鍵詞:摻鉺光纖雷射光纖網路系統
外文關鍵詞:Erbium-Doped Fiber LaserOptical Fiber Network System
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本論文的研究重點包括兩種型式雷射光源之研製及其於三種光纖網路技術之應用。主要研製直線型主振盪功率放大式多波長摻鉺光纖雷射及環型波長可調式單縱模半導體光放大摻鉺光纖雷射,並將雷射實際應用於10-Gbps高速光纖網路傳輸、波長轉換以及雙向傳輸存取網路。
本文首先說明直線型主振盪功率放大式多波長摻鉺光纖雷射的研製,雷射共振腔其中一端的反射面,採用自製的低成本寬頻光纖迴路反射鏡,來取代六個較昂貴之窄頻光纖布拉格光柵,大大改善傳統雙端光纖光柵波長對準問題,並克服六波長雷射在共振腔彼此重疊互相影響,同時產生六波長摻鉺光纖雷射。使用每段增益僅10-cm長的摻鉺光纖,雷射輸出最大功率為-12.5 dBm、訊雜比為50 dB、線寬為450 kHz、波長飄移為0.05 nm及功率擾動為0.4 dB。另外,利用模擬軟體來驗證了實驗結果,並求得主振盪功率放大式雷射之最佳化光纖長度為1.5 m,可實際提高雷射增益約6 dB。
其次,說明環型波長可調式單縱模半導體光放大摻鉺光纖雷射的研製,採用半導體光大器與環型摻鉺光纖雷射架構,研究半導體光大器飽和吸收高通濾波與抑制低頻擾動腔模分佈雜訊之功能,研製出單縱模摻鉺光纖雷射。雷射輸出最大功率為-6.5 dBm、訊雜比為53 dB、線寬為150 kHz、波長可調範圍為30 nm、波長間距為0.8 nm。此外,也利用此環型摻鉺光纖雷射高速調變10-Gbps訊號,實際單向下行傳輸單模光纖50 km,功率償付為2.4 dB。
接著,將環型波長可調式摻鉺光纖雷射應用於波長轉換,採用半導體光放大器與電吸收調變器研製單縱模光源波長轉換,我們實驗室首先將光纖雷射與電吸收調變器結合,實現了10-Gbps高速訊號波長轉換。在10-9之誤碼率與15- nm的波長轉換範圍下,功率償付為1.5~6 dB。
最後,探討注入鎖模法布里-比洛雷射之應用,在雙向傳輸存取網路中,將光纖雷射注入鎖模法布里-比洛雷射,注入後旁模雜訊比可達到40 dB,實現了10-Gbps訊號上行與1.25-Gbps訊號下行的同時雙向傳輸,傳輸10-km單模光纖後,上下行功率償付分別為0.5 dB與0.9 dB。
In this dissertation, the realization of two types of fiber lasers and their applications to fiber networks are investigated. Two types of lasers are: linear type master-oscillation-power-amplifier (MOPA) multiwavelength erbium-doped fiber lasers (EDFLs) and ring type wavelength tunable single-longitudinal-mode (SLM) EDFLs. Their applications to fiber access networks are studied for a 10-Gbps transmission, a wavelength conversion, and an injection-locked bidirectional transmission.
Firstly, we present the realization of six-wavelength EDF-MOPA linear lasers. Using a single low-cost fiber loop mirror (FLM) to replace six more expensive FBGs in the resonance cavity, we can not only reduce system cost, but also resolve overlapping problems of the six FBGs in the same resonance cavity, such as the wavelength alignment problem in a FBG pair. Using 10-cm EDF for each section, the maximum laser output power, optical signal to noise ratio (OSNR), linewidth, wavelength drift, and power fluctuation are -12.5 dBm, 50 dB, 450 kHz, 0.05 nm, and 0.4 dB, respectively. In addition, our results of simulations are in good agreement with experiments. The optimal EDF length is 1.5 m for the same pumping power and the overall gain increases by about 6 dB.
Next, the realization of wavelength tunable SLM SOA-EDF ring lasers is presented. Using an SOA as a saturable absorption high-pass filter to suppress cavity mode partition noise at low frequencies, we can obtain a stable and single-frequency laser. The maximum laser output power, OSNR, linewidth, tunable wavelength range, and wavelength spacing are -6.5 dBm, 53 dB, 150 kHz,30 nm, and 0.8 nm, respectively. It can be applied to a 10-Gbps 50-km single-mode-fiber (SMF) transmission with a power penalty of 2.4 dB.
Then, a use of the wavelength tunable SLM SOA-EDF ring lasers as probe light in wavelength conversion is described. A fiber laser and an electro-absorption modulator (EAM) have been applied to establish a 10-Gbps signals wavelength conversion. With bit error ratio below 10-9, the power penalty range is 1.5~6 dB, for a 15-nm wavelength range.
Finally, we present the application of injection-locked Fabry-Perot laser diode (FP-LD) to bidirectional transmission. sidemode suppression ratio (SMSR) after injection can reach up to 40 dB. Power penalties less than 0.9 dB and 0.5 dB are demonstrated for the simultaneously transmission over 10-km SMF of 10-Gbps downstream data and 1.25-Gbps upstream data, respectively.
Chinese Abstract ----------------------------------------------------------------------------- I
English Abstract ----------------------------------------------------------------------------- II
Acknowledgments -------------------------------------------------------------------------- IV
Contents --------------------------------------------------------------------------------------- V
List of Figures and Tables ---------------------------------------------------------------- VII
Nomenclature ------------------------------------------------------------------------------- XI
Chapter 1 Introduction -------------------------------------------------------------------- 1
1.1 Overview of Optical Communications -------------------------------------------- 1
1.2 History of Erbium-Doped Fiber Laser -------------------------------------------- 6
1.3 Research Motivation and Objectives ---------------------------------------------- 7
1.4 Organization of the Dissertation --------------------------------------------------- 9
Chapter 2 Multiwavelength EDF-MOPA Linear Lasers ----------------------- 10
2.1 Introduction -------------------------------------------------------------------------- 10
2.2 Theoretical Analysis of Linear Cavity EDFL ----------------------------------- 11
2.3 Characteristics of Fiber Loop Mirror -------------------------------------------- 19
2.4 Optimal Analysis of Software Simulations --------------------------------------24
2.5 Experimental Results and Discussion ------------------------------------------- 27
2.6 Summary of Chapter 2 ------------------------------------------------------------- 36
Chapter 3 Wavelength Tunable SLM SOA-EDF Ring Lasers -------------- 37
3.1 Introduction ------------------------------------------------------------------------- 37
3.2 Theoretical Analysis of Ring Cavity EDFL ------------------------------------- 38
3.3 Characteristics of Semiconductor Optical Amplifier -------------------------- 43
3.4 Wavelength Tunable Single-Longitudinal-Mode Fiber Laser ---------------- 49
3.5 Applications of Fiber Laser to 10-Gbps Unidirectional Transmission ------ 52
3.6 Summary of Chapter 3 ------------------------------------------------------------- 55
Chapter 4 Applications of Fiber Laser to 10-Gbps Wavelength Conversion 58
4.1 Introduction -------------------------------------------------------------------------- 58
4.2 Theoretical Analysis of Cross Absorption Modulation ----------------------- 59
4.3 Characteristics of Electro-Absorption Modulation ---------------------------- 63
4.4 10-Gbps Wavelength Conversion in WDM Distribution Networks --------- 68
4.5 Experimental Results and Discussion ------------------------------------------- 70
4.6 Summary of Chapter 4 ------------------------------------------------------------- 73
Chapter 5 Applications of Fiber Laser to Bidirectional Transmission --- 74
5.1 Introduction -------------------------------------------------------------------------- 74
5.2 Theoretical Analysis of Injection Mode-Locked Laser ------------------------ 75
5.3 Characteristics of Fabry-Perot Laser --------------------------------------------- 77
5.4 Bidirectional Transmission in WDM Access Networks ----------------------- 79
5.5 Experimental Results and Discussion ------------------------------------------- 81
5.6 Summary of Chapter 5 ------------------------------------------------------------- 86
Chapter 6 Conclusions and Future Work ------------------------------------------- 87
6.1 Conclusions -------------------------------------------------------------------------- 87
6.2 Future Work ------------------------------------------------------------------------- 89
References ---------------------------------------------------------------------------- 91
Publication List ---------------------------------------------------------------------------- 101
Biography -----------------------------------------------------------------------------------105
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