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論文名稱 Title |
利用二維光子晶體設計多通道分波多工器 The Design of Multi-channel Wavelength Division Multiplexing Based on Two-Dimensional Photonic Crystals |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
121 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2007-06-17 |
繳交日期 Date of Submission |
2007-07-03 |
關鍵字 Keywords |
分波多工器、光子晶體、解多工器、耦合腔波導、濾波器 Coupled Cavity Waveguides, Demultiplexer, Wavelength Division Multiplexing, Photonic crystals, Drop Filter |
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統計 Statistics |
本論文已被瀏覽 5717 次,被下載 16 次 The thesis/dissertation has been browsed 5717 times, has been downloaded 16 times. |
中文摘要 |
使用分波多工技術 (wavelength-division multiplexing) 之通訊系統可以對頻寬作較有效率的運用。由於光子晶體的介電常數成周期性變化而具有能隙,頻率落在此能隙中的光子無法在光子晶體中傳輸。因而可藉由在光子晶體內置入缺陷結構來控制光在特定的路徑傳播。 本論文討論了耦合腔波導(CCWs)和濾波器的一些特性。然後我們利用耦合腔波導來設計多通道的分波多工器。其可以濾出1310/1490/1550 nm等波長並應用在光纖到家(FTTH)系統上,且可以使輸出波長的頻寬變窄以便濾出更多的波段。此外,由於調整光子晶體中共振腔的大小,可以擷取出特定的波長,所以我們利用此特性設計一個半高寬為0.8 nm的多通道擷取濾波器。此架構具有100%的擷取效率、高Q值和極低的耦合干擾,並符合粗分波多工技術(CWDM)的規格。這種積體化光子晶體之解多工器和擷取濾波器相當適用於分波多工的光通訊系統中。 |
Abstract |
The communication system using Wavelength-division multiplexing (WDM) allows for better utilization of the spectral bandwidth. Photonic crystals (PhCs) exhibit photonic bandgap (PBG) due to the periodic variation of the dielectric constant and photons with a range of frequencies within the PBG cannot travel through the crystal. By introducing defects into PhCs, it is possible to control the light propagation along certain paths. In this thesis, the characteristics of coupled cavity waveguides (CCWs) and drop filter are discussed. Then we propose a multi-channel WDM system based on CCWs. It can be applied in FTTH to filter the wavelengths of 1310, 1490 and 1550 nm in different CCWs and also can make the bandwidth of output wavelength become narrow to filter more wavelengths. In addition, by modulating the size of the resonator on the PhCs, it can drop the particular wavelength into the waveguide. Finally, we proposed a multi-channel drop filter with FHWM 0.8 nm. This device design is leading the way to achieve CWDM specification with 100% drop efficiency, high quality factor and almost no crosstalk. The operations of such an ultra-compact demultiplexer and drop filter based on PhCs are suitable to be used in WDM optical communication systems. |
目次 Table of Contents |
Acknowledgements i Abstract iii Contents v List of Figures vii List of Tables xvi List of Symbols xvii Chapter 1: Introduction 1.1 General Reviews of Photonic Crystals 1 1.2 Photonic Crystal Components 3 1.2.1 Defects 3 1.2.2 Photonic Crystal Waveguides 4 1.2.3 Coupled Cavity Waveguides 4 1.3 Applications of Photonic Crystals 7 1.3.1 FTTH 7 1.3.2 CWDM and DWDM 7 1.4 Organizations of the Thesis 9 Chapter 2: Basic Theory and Simulation Method 2.1 Introduction 17 2.2 Plane Wave Expansion Method (PWE) 17 2.3 Finite Difference Time Domain Method (FDTD) 22 Chapter 3: The Study of N-channel Demultiplexer Based on Two-Dimensional Photonic Crystals with Coupled Cavity Waveguides 3.1 Introduction 33 3.2 A T-branch 1310/1550 nm Wavelength Demultiplexer Based on Two-Dimensional Photonic Crystals 36 3.2.1 Analysis 36 3.2.2 Numerical Results and Discussions 38 3.3 A New Approach of Multi-channel Wavelength Division Multiplexing with Coupled Cavity Waveguides 41 3.3.1 Analysis 41 3.3.2 Numerical Results and Discussions 43 3.4 Summary 45 Chapter 4: Multi-Channel Drop Filters Based on Two-Dimensional Photonic Crystals 4.1 Introduction 67 4.2 Theoretical Modeling and Analysis 70 4.3 Numerical Results and Discussions 63 4.4 Summary 77 Chapter 5: Conclusions 5.1 Summary 94 5.2 Suggestions for Future Researches 95 References 96 |
參考文獻 References |
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