本論文研究重點，主要是對於光放大器的特性作最佳化的方法。使用非同調光幫浦的分散式拉曼光纖放大器，預先指定其尖峰功率之波長，此波長稱之為極值波長。我們以應用於100km的TW-Reach分散式拉曼光纖放大器為設計範例，考慮雙向幫浦所設計的放大器，要求在70-nm信號頻寬中有低於0.3dB增益差和低於0.3dB雜訊差。對於使用雙向幫浦的分散式拉曼光纖放大器，我們先固定順向幫浦頻譜的極值波長，選定ㄧ可以使增益漣波降低的幫浦光波段，再去設定逆向幫浦頻譜的極值波長，以降低雜訊漣波。由研究發現最佳化的雙向幫浦具有特定的結構。固定順向幫浦光的極值波長，設計位移100nm附近的逆向幫浦波長頻帶之功率頻譜密度最小，可以得到最低的等效雜訊漣波。

The method to design the incoherent pump power spectrum with pre-assigned extremum pump wavelength for the distributed fiber Raman amplifier (DFRA) is presented. Two 100-km TW-Reach DFRAs using bidirectional pumping respectively are taken as examples, in which the gain ripple is less than 0.3 dB and NF ripple less than 0.4 dB over 70-nm bandwidth. For the DFRA using bidirectional pumping, first we set the extremum wavelength of co-pump and chose a pump band resulting low gain ripple, and then set extremum wavelength of counter-pump to decrease the noise figure ripple. The result shows optimized bidirectional pump power spectral has a specific structure. We found that low gain ripple and noise figure ripple can be achieved by selling to set 100nm separation between the extremum wavelength of co-pump and the wavelength of minimum extremum spectral power density of counter-pump, which is about Ramam gain bandwidth.

中文摘要 I Abstract II 誌謝 III 目錄 IV 圖目錄 V 表目錄 VII 第一章 緒論 1 1.1研究背景 1 1.2研究動機 1 第二章 光放大器介紹 3 2.1光纖拉曼放大器 4 2.2摻鉺光纖放大器EDFA(Erbium-Doped Fiber Amplifier) 5 第三章 拉曼光纖放大器工作原理 10 3.1 拉曼光纖放大器的基本原理 10 激發性拉曼散射(SRS) 10 拉曼增益係數 (gUBURUBU) 10 拉曼增益 (Gain) 10 拉曼增益飽和(Raman gain saturation) 12 雜訊指數 (noise figure) 13 光纖傳輸波動方程式 13 3.2 分散式拉曼光纖放大器(distribution FRA) 之架構 14 第四章 光纖放大器設計 18 4-1 放大器模型和設計方法 18 4.2 使用雙向幫浦設計DFRA 25 第五章 結論 49 5-1 研究結果 49 5-2改善與檢討 50 參 考 文 獻 52

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