臺灣博碩士論文加值系統

本論文針對非分佈式拉曼光纖放大器的設計和特性進行研究，並探討多個幫激波長架構的光放大器特性。近來由於半導體雷射的功率日漸提高，使得非分佈式拉曼光纖放大器能實際運用於光纖通信系統中，而拉曼光纖放大器具有低雜訊和任意增益頻帶配置兩項優點，在未來光纖通信系統中將擔任重要的角色。實驗和模擬架構上我們均採用後向幫激的方式，在實驗和模擬的相互印證下，得知模擬對於四個幫激波長架構有最佳的吻合度，我們得以設計出四個幫激波長架構的長波段增益平坦化非分佈式摻鉺光纖放大器。實驗結果顯示我們所設計的長波段非分佈式摻鉺光纖放大器，在1565 nm ~ 1595 nm波段中，對七個功率為-16dBm的輸入信號有良好的增益平坦度 (≦1 dB) ，而信號增益均在10 dB以上。

In this thesis, we investigate the design and amplification characteristics of discrete fiber Raman amplifier (FRA), and discuss with amplification characteristics of FRA by employing multi-pumping-wavelength configuration. Recently, because of the invention of high output power of pump laser diodes, so discrete FRA can be practically employed in optical fiber communication system. The fiber Raman amplifier has two merits. One is the low noise characteristic and the other is the arbitrary spectral gain band, so it will play an important role in optical communication system. In this study, we employ backward pumping configurations in the experiment and simulation of discrete FRA. By comparing with results of experiment and simulation, we prove that the simulation results quite agree with the experimental data of four pumping wavelengths configuration, we have successfully designed an L-band gain flattened discrete FRA by using four pumping wavelengths configuration. The experimental results showed that the amplifier, for the input of seven optical channel each with —16 dBm input power level, has an optical gain of >10 dB of each channel with good gain uniformity (<1 dB) in the 1565-1595 nm wavelength region.

內容目錄
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3
第二章、拉曼光纖放大器之工作原理與特性4
2.1 拉曼光纖放大器(FRA)的基本原理4
2.1.1 激發性拉曼散射(SRS)……………………………………..4
2.1.2 拉曼增益係數(gR)……………………………………….…4
2.1.3 拉曼增益(Gain)………………………………………….…5
2.1.4 拉曼增益飽和(Raman gain saturation)………………….…7
2.1.5 雜訊指數(noise figure)……………………………………..8
2.1.6 雙重雷利散射(double Rayleigh scattering, DRS)…………8
2.2 非分佈式拉曼光纖放大器(discrete FRA)之討論……………….10
2.2.1 基本光路架構……………………………………………..10
2.2.2 幫激光源…………………………………………………..10
2.2.3 討論………………………………………………………..11
第三章、非分佈式拉曼光纖放大器之模擬與實驗12
3.1 實驗與模擬結果比較12
3.1.1 實驗與模擬架構…………………………………………..12
3.1.2 實驗和模擬之比較與討論………………………………..14
3.2 長波段增益平坦化非分佈式拉曼光纖放大器(L-band gain flattened discrete FRA)之研製……………………………….….16
3.2.1 增益平坦化非分佈式拉曼光纖放大器之特性……..…....16
3.2.2 增益平坦化非分佈式拉曼光纖放大器之設計與實驗….17
3.3 非分佈式拉曼光纖放大器之特性實驗………………………….20
3.3.1 高功率幫激光源架構實驗………………………………..20
3.3.2 多波長系統拉曼光纖放大器特性量測實驗……………..22
3.3 討論……………………………………………………………….23
第四章、結論…………………………………………………………….24
參考文獻…………………………………………………………………...26……………………………………………………………………..27
表目錄
頁次
表一.使用Lucent DCF模擬和實驗架構之幫激功率大小…………………18
表二.使用Sumitomo DCF模擬和實驗架構之幫激功率大小………………18
表三.模擬和實驗輸出功率相差值(△P )/探測信號(Pin): 0 dBm……………21
表四.模擬和實驗輸出功率相差值(△P)/探測信號(Pin) : -16 dBm.………...21
圖目錄
頁次
圖1.1非分佈式 (discrete) 和分佈式 (distributed) 拉曼光纖放大器 (FRA) 架構圖………….………………………………………………………..28
圖2.1激發性拉曼散射示意圖………….………………………….……….....28
圖2.2拉曼增益係數頻譜圖…………………………………………………...29
圖2.3不同輸入光信號功率之拉曼增益與幫激光功率的關係圖…………...29
圖2.4拉曼增益與輸入光信號功率之關係圖……………...…………………30
圖2.5雙重雷力散射(DRS)與不良接續面及連接器作用造成雜訊功率增加示意圖…………………………………………………………………...30
圖2.6有無雙重雷力散射(DBS)對光雜訊比的影響……………………..…...31
圖2.7非分佈式拉曼光纖放大器基本光路架構……………………………...31
圖2.8幫激光源極化方向對前向與後向幫激架構增益影響………………………………………………………………………...32
圖2.9幫激光源極化方向控制示意圖…………………………….…………..32
圖2.10光纖雷射架構圖(IPG-Photonics)………………...……………………..33
圖2.11功率合波器結合四個幫激波長的架構示意圖(Wavesplitter)…………33
圖3.1實驗及模擬架構圖………………….……………….……..………..34
圖3.2增益光纖(DCF)損失頻譜圖.…………………………………….……..35
圖3.3幫激光源頻譜分佈圖……………………………………….…………..35
圖3.4二個幫激波長架構實驗與模擬比較圖……...…………………………36
圖3.5四個幫激波長架構實驗與模擬比較圖……….……..………………37
圖3.6多幫激波長疊加增益平坦頻寬(未考慮幫激波長間的相互作用)……………………………………………………………………..…38
圖3.712個幫激波長頻譜配置圖(Namiki 研究群)…….…………………….38
圖3.8多幫激波長疊加增益平坦頻寬(考慮幫激波長間的相互作用)……..38
圖3.9實驗結果與重疊定理之頻譜比較圖…………………………………...39
頁次
圖3.10增益平坦化非分佈式拉曼光纖放大器實驗與模擬架構圖……………………………………………………………...…………40
圖3.11(a)輸入信號功率頻譜圖(Pin: -16 dBm)……………...…………………41
圖3.11(b)輸出信號功率頻譜圖(Lucent DCF)………………………………….…41
圖3.11(c)輸出信號功率頻譜圖(Sumitomo DCF)………………………………...41
圖3.12高功率幫激光源模擬輸出功率頻譜圖………………………………...42
圖3.13高功率幫激光源實驗輸出功率與增益頻譜圖(Pin=0dBm)…………...43
圖3.14高功率幫激光源實驗輸出功率與增益頻譜圖(Pin=-16dBm)…………44
圖3.15高功率幫激光源實驗與模擬輸出功率比較頻譜圖…………………...45
圖3.16高功率幫激光源實驗與模擬輸出功率比較頻譜圖………………...…46
圖3.17不同幫激波長架構相同幫激功率之增益頻譜比較圖………………..47
圖3.18飽和信號(saturation tone)量測方法之實驗架構圖…………………….48
圖3.19飽和信號與單一信號量測之增益頻譜比較圖………………………...48

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