本論文針對高轉換效率的平坦化長波段摻鉺光纖放大器進行研究，分別在980 nm及1480 nm的幫激波長下找出最佳的架構。我們以在各個波道能達到最高的輸出功率下，32個波長的增益平坦度＜0.7 dB，雜訊指數NF＜6 dB作為設計的準則。模擬的九種架構包含了（a）雙前向幫激（b）雙後向幫激（c）前後向幫激（d）後前向幫激，再分別討論有無加入光隔離器的架構。最後找出在1480 nm幫激波長下的FBIp架構為具有高轉換效率且增益平坦的長波段摻鉺光纖放大器。我們亦實際組裝與理論模擬相同之最佳架構的長波段摻鉺光纖放大器並量測其特性，發現模擬的結果和實驗的數據吻合。最後，我們探討傳統波段摻鉺光纖放大器加入增益平坦濾波器來維持32個波道增益的平坦。長波段(L-band)的放大器與傳統波段(C-band)的摻鉺光纖放大器並行使用，能夠增加DWDM系統的容量達一倍以上，達成寬頻放大器的目標。

In this thesis, we theoretically investigate optimum configurations of high conversion efficiency and gain-flattened L-band (1570-1600 nm) erbium-doped fiber amplifier (EDFA) by employing the 1480 nm and 980 nm bi-directional pumping configuration. The design criterion of L-band EDFA is to achieve highest channel output power while keeping the differential channel gain to be ＜0.7 dB among 32 channels with low channel noise figure of ＜6 dB. The nine L-band EDFA configurations are examined and compared. These configurations considered include the dual-forward, dual-backward, and different bi-directional pumping schemes, each with and without the midway optical isolator. Among all configurations, we find that the pump-pass case in forward-and-backward pumping scheme by employing the 1480 nm pumping wavelength is the best configuration to offer the highest channel output power with good channel gain uniformity and moderate low noise figure. Then we verified the simulation results through experiments. We also theoretically investigate gain-flattened C-band (1530-1560 nm) EDFA. Using L-band and C-band EDFAs in parallel, we can greatly expand the amplification wavelength region.

誌謝 I
中文摘要 II
英文摘要 III
內容目錄 IV
表目錄 V
圖目錄 VI

第一章 簡介 1
1.1 研究背景 1
1.2 研究動機 2
1.3 論文結構 2
第二章 長波段摻鉺光纖放大器之理論與模擬 3
2.1 長波段摻鉺光纖放大器基本原理 3
2.2 980 nm雙幫激長波段摻鉺光纖放大器之理論模擬 4
2.3 1480 nm雙幫激長波段摻鉺光纖放大器之理論模擬 10
2.4 討論..……………………………………………………..……….12
第三章 長波段摻鉺光纖放大器之實驗 13
3.1 光放大器特性參數的定義與量測方法 13
3.2 元件的特性量測與放大器的組裝 17
3.3 1480 nm幫激波長FBIp架構 18
3.4 980 nm幫激波長FBIp架構 21
3.5 討論...……………………………………………………………..23
第四章 寬頻摻鉺光纖放大器之設計與模擬 24
4.1 傳統波段摻鉺光纖放大器之理論與模擬 24
4.2 寬頻摻鉺光纖放大器 28
第五章 結論 29

參考文獻 31
附表 33
附圖 39

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