臺灣博碩士論文加值系統

摘要
在光纖通訊中，光訊號會因為在傳輸過程中增加額外的雜訊以及因為色散造成光訊號失真。也因此，訊號重建是光通訊非常重要的課題之一。本文中我們利用了許多矽波導的非線性現象達到訊號重建；像是XPM、X-TPA、FCD以及FCA，說明了矽波導是可以做為全光式訊號重建系統的元件。
一般來說，利用矽的非線性現象做為主動或被動光學元件的發展以及應用性，常因為TPA以及所引發的FC效應而受限，儘管矽這個材料在天生上擁有非常多優越的光學性質。
在此論文中，我們提出了以矽波導取代高度非線性色散光纖做為訊號重建的元件，除了利用XPM產生頻譜的位移外，並模擬分析出自由載子生命週期長短對頻譜位移的影響，更利用傳統玻璃光纖所缺乏的X-TPA、FCA和FCD等非線性效應以及光學濾波器使訊號品質改善。
模擬的結果說明了若能有效的控制自由載子生命週期至30ps，的確是可以利用長度僅僅1cm的矽波導取代長度750m的高度非線性色散光纖做為全光式訊號重建系統的元件，同時有機會整合到一片非常小的晶片中。

摘要 2
Abstract 3
致謝 4
目錄 5
第一章 緒論 6
1.1 前言 6
1.2 研究動機與目的 8
1.3 論文架構 10
第二章 矽波導的非線性現象 11
2.1 矽材料簡介 11
2.2 矽波導的色散現象 13
2.3 自相位調變﹝self-phase modulation﹞ 17
2.4 交錯相位調變﹝cross-phase modulation﹞ 21
2.5 雙光子吸收﹝Two-photon absorption﹞與其影響 22
2.4.1雙光子吸收﹝two-photon absorption﹞ 22
2.4.2自由載子影響﹝Free-carrier effects﹞ 23
第三章 全光式訊號重建 30
3.1 模擬模型與數值方法 30
3.1.1非線性薛丁格方程式﹝nonlinear Schrödinger equation﹞ 30
3.1.2數值方法 33
3.2 全光式訊號重建架構與原理 35
3.3 模擬結果與分析 36
3.4 全光式訊號重建 43
3.4.1訊號品質Q、OSNR以及ER的定義 43
3.4.2全光式訊號重建模擬結果與分析 44
第四章 結論與展望 50
附錄(一)程式碼 51
附錄(二)中英縮寫對照表 57
參考文獻 58

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