臺灣博碩士論文加值系統

論文摘要
在波長多工(WDM，wavelength-division multiplexed)的光通訊系統上，我們設計的光放大器必須考慮到系統頻寬的增加，以提高系統的傳輸容量，因此，近年來長波長摻鉺光纖放大器的相關研究，即是為了要擴充傳統C band放大器頻寬的不足，並透過簡單的系統設計達成C+L band寬頻放大器的設計。
因此，長波長(1570nm~1600nm)摻鉺光纖放大器的研究及實驗設計就顯的相當的重要，我們在長波長摻鉺光纖放大器(L band EDFA)的系統設計上，利用了一個布拉格光纖光柵(FBG)，以及3dB耦合器所組成的Fiber Loop Mirror系統，構成具有增益箝制功能之L band EDFA，其增益箝制的波長設定於1565nm，來取代傳統上利用一組布拉格光纖光柵(FBG)，以及一組optical circulators加上thin film filter的增益箝制架構，更進一步利用Fiber Loop Mirror反射訊號的機制，設計double pass的系統架構來有效提升L band訊號的增益值，且利用兩級串接的系統設計概念，使得系統的雜訊指數主宰於第一級的放大器，如此一來，藉由第一級摻鉺光纖放大器設計為L band訊號預先放大的功能，來降低系統的雜訊指數之外，並結合第一級未飽和之光纖放大器，以及第二級具有增益箝制架構的光纖放大器，達成整體光放大器具有部分增益箝制功能的放大器系統，最後，亦利用調整摻鉺光纖的長度設計，達到在L band頻譜範圍內增益平坦的效果，使得整個1570nm至1600nm的頻譜均能有效的利用。總言之，透過我們的系統設計，可以實現高增益，低雜訊指數，以及具有增益平坦和高飽和增益值的摻鉺光纖放大器系統。

目錄
論文摘要
第一章 論文簡介
1.1 研究背景 …………………………………………………1
1.2 論文架構 …………………………………………………2
第二章 摻鉺光纖放大器（EDFA）之基本原理
2.1 摻鉺光纖放大器的基本特性 ……………………………3
2.2 摻鉺光纖放大器的雜訊分析 ……………………………9
2.3 增益箝制光纖放大器的基本原理………………………16
第三章 L band EDFA
3.1 L band EDFA 之基本原理………………………………19
3.2 增益平坦L band EDFA之設計…………………………22
3.3 增益箝制L band EDFA …………………………………45
第四章 結論 ……………………………………………………58
參考文獻 ………………………………………………………62

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