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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85386
標題: | 矽核光纖製程和退火方法之改善與探討耦合形波導折射率感測器的優化 Improvement in Fabrication and Annealing Methods of Silicon Cored Fibers and Optimization of Coupled Waveguide Refractive Index Sensors |
作者: | 蘇江平 Chiang-Ping Saw |
指導教授: | 王倫 Lon A. Wang |
關鍵字: | 矽核光纖,光纖抽絲,雷射退火,折射率感測器,耦合模理論, silicon cored fiber,fiber drawing,fiber annealing,refractive index sensor,coupled mode theory, |
出版年 : | 2022 |
學位: | 碩士 |
摘要: | 在本論文中,我們研究並提出了提高SCF產量和品質的方法。我們還設計了一套用於設計耦合型波導折射率傳感器的指南。在第二章中,我們推斷氣泡的形成導致SCF產量低和質量差。我們發現通過增加預形體的內徑可以緩解該問題,並提出了一種新的兩段式SCF抽絲方法以配合新的預形體尺寸。我們也設計並建造了這種新方法所需的自動化設備。我們還做了爐體加熱預形體的熱模擬,以了解熔爐的各種參數如何影響抽絲過程中預形體的溫度分佈。在第三章中,我們通過熱模擬和實驗研究了 CO2 雷射退火過程中,SCF 的溫度分佈,以便有效的控制退火過程。我們也建立了一個SCF矽核溫度檢測器和 SCF 定位器材以利於退火實驗。我們還研究了 SCF 中單模耦合和單模傳輸的可行性,並編寫了一個程序來識別在少模光纖中傳播的模式的。我們也對 SCF 的光場進行近場測量。在第四章中,我們使用耦合模理論和數值分析來找出提高耦合型波導折射率傳感器性能的方向,並用光學模擬驗證我們的推導。 In this thesis, we investigated and developed methods to improve the production and quality of SCF. We also devised a set of guidelines for designing coupling-based waveguide refractive index sensors. In chapter 2, we deduced that the formation of air bubbles causes low yield and poor quality of SCF. We found out the problem can be partly mitigated by increasing the inner diameter of the preform. Therefore, a new two-stage drawing method for SCF drawing is proposed to draw the preforms with new geometry. Automated equipment needed for this new method is designed and built. We also conducted thermal modeling to understand how the furnace parameters affect the temperature distribution of the preform during the drawing process. In chapter 3, we investigated the temperature distribution in SCF during CO2 laser annealing through thermal simulation and experiment so that we can better control the annealing process. A new annealing set-up is built with a thermal monitor and a SCF positioning system. We also investigated the viability of single mode coupling and transmission in SCF and wrote a computer program to identify the amplitude of modes traveling in a few-mode fiber. Near field measurement of SCF is also carried out. In chapter 4, we used Coupled Mode Theory with numerical analysis to devise a set of guidelines for improving performance in a coupled waveguide RI sensor. The results are validated with optical simulation. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85386 |
DOI: | 10.6342/NTU202204042 |
全文授權: | 同意授權(全球公開) |
電子全文公開日期: | 2025-09-08 |
顯示於系所單位: | 光電工程學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
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ntu-110-2.pdf 此日期後於網路公開 2025-09-08 | 8.28 MB | Adobe PDF |
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