臺灣博碩士論文加值系統

本論文是討論光波導元件的特性，吾人將分別對非線性平面光波導與光子晶體光波導二種不同的形式的光波導來做探討。非線性平面光波導是指光波導結構中含有折射率會隨電場強度而改變的介質。利用空間光固子碰撞的特性，在這裡提出了導波層為非線性的全光式切換器與分波多工器。經由適當的功率及元件長度，將可達成切換器與分波多工的功能。
光子晶體是指由二種或二種以上不同介質材料呈週期性排列的結構。在此週期性排列的介電材料會造成某部分頻率的電磁波無法在晶體內傳遞，此區域稱為光子能隙。吾人將利用此現象去設計光子晶體光波導，利用時域有限差分法及平面波展開法去分析光子晶體光波導結構。首先藉由平面波展開法分別繪出其不同波導寬度的色散曲線圖及其模態。利用此特性去實現一個1310奈米與1550奈米解多工器的功能。另外我們討論光子晶體方向耦合器，利用方向耦合器去設計一個具有波長選擇功能的介質柱方向耦合器。當輸入不同的波長，它可以使能量在不同的輸出端間轉換。在超高速與超高容量的光通與光資訊處理應用中，這些結構將扮演極重要的關鍵元件。

In this thesis, it discussed the properties of optical waveguides. We analyze the planar nonlinear waveguide and photonic crystal waveguide, respectively. Nonlinear waveguide means that the refractive indices of the optical waveguide changed with the electric field intensity. By using the spatial solitons collision properties, we proposed all-optical switch and wavelength auto-router with nonlinear-guided film layer. The numerical results show that the proposed photonic device could really function by simply adjusting parameters such as the input power, the device length.
A photonic crystal is a revolutionary class of artificially periodic electromagnetic media, in which a fundamentally new electromagnetic phenomenon can be achieved. A photonic band gap defines a range of frequencies for which light is forbidden to exist inside the crystal. In such waveguides, the optical field is confined, horizontally, by a PBG provided by the photonic crystal. By using plane-wave expansion method and finite-difference time-domain method to analyzed photonic crystal waveguide structure. It not only obtained dispersion relation curves, but also observed the field patterns at various width of waveguide. The numerical results show that this device could really function as a 1310 nm/1550 nm demultiplexer. In addition, we will study photonic crystal directional coupler. Then, we will design a coupler device based on a dielectric-rod photonic crystal for efficient wavelength-dependent coupling. It is found that the coupled power ratio between the two output ports can be reversed when launch different optical signal wavelength. These would be a potential key component in the applications of ultra-high-speed and ultra-high-capacity optical communications and optical data processing systems.

List of Tables
List of Figures
Chapter 1: Introduction
Chapter 2: Beam Propagation Method and Finite-Difference Time-Domain Method
2.1. Beam Propagation Method
2.2. Finite-Difference Time-Domain Method
Chapter 3: New All-optical Switch Using the Local Nonlinear Mach-Zehnder Interferometer
3.1. Introduction
3.2. Analysis
3.3. Numerical Results
3.4. Summary
Chapter 4: New All-Optical Switch and Wavelength Auto-Router Based on Spatial Solitons
4.1. Introduction
4.2. Analysis
4.3. Numerical Results and Discussions
4.4. Summary
Chapter 5: 1310/1550-Nanometer All-Optical Wavelength Router Using Photonic Crystal Waveguides
5.1. Introduction
5.2. Theoretical Modeling and Analysis
5.3. Numerical Results and Discussions
5.4. Summary
Chapter 6: Wavelength Demultiplexing Structure Based on Directional Coupler Waveguides in 2-D Photonic Crystal
6.1. Introduction
6.2. Analysis
6.3. Numerical Results and Discussions
6.4. Summary
Chapter 7: Conclusion
Reference

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