臺灣博碩士論文加值系統

本論文的主旨在研究擷取網路中的光分碼多工擷取和被動光網路，及其應用。在光分碼多工擷取之應用研究部分，主要利用增益開關(gain-switched)的Fabry-Perot雷射二極體, 在直調的資料調變方式來實現窄脈衝光源，以取代舊有利用兩個麥克詹達(Mech-Zender)調變器的方式，達到低成本的效益，並實際架設一套光分碼多工的編碼器，對我們所提出的光源進行編碼的動作，來驗證此光源在光分碼多工擷取系統中是否可行。
在被動光網路的應用研究部分，包含研究具有自我治癒能力、提供更多使用者的星-環-巴士架構的分波多工光纖-微波系統，期望所提出之系統能對舊有無保護系統達到改進的功效，第二個部分是提供自我治癒能力和區域網路實現的多重服務乙太網路，讓有線的乙太網路和無線網路結合，以因應目前對兩個系統高資料量的需求，並對舊有的光區域網路實現加以改進，而節省成本。
另外並提供可調式雙波長、多波長雷射的實作方法，希望能做為光分波多工系統的低成本多波長光源，主要是利用混合式放大器做為增益媒介的環狀光纖雷射，這種混合式的放大器是參鉺波導放大器和半導體光放大器所組成。最後並提出一種效能良好的長距離光纖布拉格光柵偵測系統，也是利用上述的混合式放大器來做為放大媒介，以期能對擷取網路提供光纖斷點偵測，進而未來能提供保護的功能。這些應用的原理與架構已詳盡的分析與實驗來驗證，上述的成果預期將有助於光纖通訊系統的發展。

In this thesis, we study the applications of optical code division multiple access and passive optical network for access network. The content of optical code division access applications is the realization of generating optical short pulse using gain-switched Fabry-Perot laser diode to replace the previous structure using two Mech-Zender modulators. We also construct a novel optical code division multiple access encoder to verify if the proposed light source is feasible in OCDMA system.
The content related to passive optical network applications includes WDM-PON: a star-ring-bus architecture for WDM fiber-wireless system with self-healing function, and Ethernet PON: a multi-service access network with self-healing function and local area network emulation. Besides, we experimentally realize a tunable dual-wavelength and a multi-wavelength fiber ring laser. Finally, we provide a long distance fiber Bragg gratings sensor system to detecting fiber fault in access network. These investigations and demonstrations will be useful in the field of communication systems.

Chinese Abstract………………………………………………...….…...I
English Abstract………………………………………………..……....II
Acknowledgements……………………………………………………III
Contents…………………………………………………………..……IV

Chapter 1: General Introduction 1
Chapter 2: Optical Code Division Multiple Access 3
2.1—Abstract of Optical Code Division Multiple Access………….….………….3
2.1.1 Introduction…………………………………………………………...3
2.1.2 The basic ideas behind optical code division multiplexing access…...4
2.1.3 Typical encoder and decoder of optical CDMA……………...………6
2.1.4 Potential advantages and challenges of optical CDMA systems……..9
2.1.5 Conclusion………………………………………………….……......11
2.2—An OCDMA Light Source using Directly Modulated Fabry Perot Laser
Diode in an External Injection Scheme…………………………………...12
2.2.1 Introduction……………...………………………………....………..12
2.2.2 Experiment and results…………………………………....…………13
2.2.3 OCDMA encoder……………………………………….……………16
2.2.4 Conclusion………………………………………………….………..17
Chapter 3: Passive Optical Network 18
3.1—Wavelength-Division-Multiplexing Passive Optical Network Using External Modulation Technique:
A Star-Ring-Bus Architecture for WDM Fiber-Wireless System…………18

3.1.1 Introduction……...…………………………………………………...18
3.1.2 Architecture description…………………...……………….………...19
3.1.3 Experimental setup and results………………………...…………….24
3.1.4 Conclusion…………………………………………………………...26
3.2—Ethernet Passive Optical Network Using Direct Modulation Technique:
Multi-Service Access Network with Self-Healing Function and Local Area
Network Emulation……………………………………...………………..27
3.2.1 Introduction…………………………………………………………27
3.2.2 Proposed architecture………………………………………...……..28
3.2.3 Experiment and results…………………………………..…...…..…30
3.2.4 Conclusions………………………………….……………………...32
Chapter 4: Multi-wavelength laser source 33
4.1—Tunable Dual-Wavelength Fiber Ring Lasers Using an S-band Erbium
Doped Fiber Amplifier…………………………………………………….33
4.1.1 Introduction………………………………………………………….33
4.1.2 Experiment and results…………………………………….………...34
4.1.3 Conclusion…………………………………………………………...37
4.2—Multi-wavelength Fiber Laser using S-band Erbium-Doped Fiber
Amplifier and Semiconductor Optical Amplifier………………………….38
4.2.1 Introduction………………………………………………………….38
4.2.2 Experiment and results……………………….……………………...39
4.2.3 Conclusion……………………………………...……………………43
Chapter 5: Optical sensor system 44
Long-distance fiber grating sensor system using a fiber ring laser with
EDWA and SOA…………………………………………………………………44
5.1 Introduction…………………………………………………………….…….44
5.2 Experiment and results……………………………………………….………46
5.3 Conclusion…………………………………………………………..………..51
Chapter 6: Summary for the Thesis 52
6.1 Conclusion……………………………………………………………………...52
6.1.1 An OCDMA light source using directly modulated Fabry Perot laser
diode in an external injection scheme…………………..…………..…...52
6.1.2 A star-ring-bus architecture for WDM fiber-wireless system……….…..52
6.1.3 Multi-service access network with self-healing function and local area network emulation………………………...………………….…………53
6.1.4 Tunable dual-wavelength fiber ring lasers using a S-band Erbium doped
fiber amplifier……………………………………………..…….…...…53
6.1.5 Multi-wavelength fiber laser using S-band Erbium-doped fiber amplifier
and semiconductor optical amplifier…………………….……...………53
6.1.6 Long-distance fiber grating sensor system using a fiber ring laser with
EDWA and SOA…………………………………………..………..…..54
6.2 Suggestions for the future work……………………………………………......54
Publications 55
References 56

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