臺灣博碩士論文加值系統

本篇論文主要是探討模態選擇光纖耦合器之實際製作技術。一般常見的光纖耦合器之功能或是作為光功率之分光或是作為粗波長多工之分波，而光纖模態選擇器則是利用熔接的技術來將雙模光纖內之不同傳播模態的光給分開出來，如果搭配由tilted fiber grating所構成之模態轉換器來使用，即可成為一個密波長多工之之光篩選器。在本研究中我們實際試製了一些熔燒式光纖模態選擇耦合器並量測其特性，我們的結果初步證明了這種新元件的可行性。

In this thesis we investigate the fabrication techniques of biconical mode-selective fiber couplers. In contrast to usual couplers which act as either power splitters or coarse wavelength multiplexers, the mode-selective couplers can be used to separate lights in different propagation modes of a two-mode fiber. When combined whith mode-converters made of tilt fiber Bragg gratings, they can also act as dense-wavelength-division-multiplexing optical add-drop multiplexers (DWDM OADMs). We have actually fabricated several biconical mode-selective couplers and measured their characteristics. These preliminary results demonstrate the feasibility of the studied new device !

中文摘要…………………………………………………………………i
英文摘要……………………………………………………………… ii
誌謝……………………………………………………………………iii
目錄 ……………………………………………………………………iv
圖表目錄 ………………………………………………………………vi
第一章 序論……………………………………………………………1
1.1 常見製作耦合器的方法………………………………………1
1.2 光篩選器………………………………………………………2
1.3 論文架構………………………………………………………3
第二章 原理及計算方法 ………………………………………………8
2.1 利用模態展開求解耦合係數…………………………………9
2.1.1 理想模態展開法(expansion in terms of ideal
modes) …………………………………………………11
2.1.2 區域正規模態展開法(expansion in terms of local
normal modes) ………………………………………13
2.2 利用微擾法(perturbation approach)求解耦合係數……14
2.3 Beam Propagation Method…………………………………17
2.3.1 快速傅立葉轉換(Fourier transform)………………18
2.3.2 有限差分法(finite difference method)…………20
2.4 利用套裝軟體計算兩根波導管間對稱與不對稱模態…………21
2.5 利用微擾法並與套裝軟體計算比較……………………………23
2.6 利用變分法計算等效折射率並與套裝軟體比較………………24
第三章 實驗及結果………………………………………………………36
3.1 使用低火溫製作模態選擇耦合器………………………………37
3.2 使用高火溫製作模態選擇耦合器………………………………39
3.3 實驗結果與討論…………………………………………………40
第四章 結論及展望………………………………………………………52
參考文獻……………………………………………………………………54

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