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研究生:賴富順
研究生(外文):Fu-Shun Lai
論文名稱:摻鉺光纖光放大器ASE雜訊與失真分析
論文名稱(外文):Analyses of Amplified Spontaneous Emission Noise and Distortions in Erbium-Doped Fiber Amplifiers
指導教授:劉政光劉政光引用關係
指導教授(外文):Cheng-Kuang Liu
學位類別:博士
校院名稱:國立臺灣科技大學
系所名稱:電子工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:中文
論文頁數:148
中文關鍵詞:摻鉺光纖光放大器受放大自發放射調變失真參數萃取溫度效應
外文關鍵詞:Erbium-Doped Fiber AmplifierAmplified Spontaneous EmissionModulation DistortionParameter ExtractionTemperature Effect
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  本文針對摻鉺光纖光放大器在光通信或感測元件的應用,提出簡便之特性分析與參數萃取方法。首先,文中討論影響摻鉺光纖光放大器之ASE雜音特性,提出NNAF因子作為光放大器受ASE影響的指標。同時,導出一個簡便的變動量計算方法,可定性及定量估算ASE對摻鉺光纖光放大器信號增益的影響程度。在使用忽略ASE的摻鉺光纖光放大器簡化模型時,可作為簡化模型之適用性評估。
  其次,文中以直流及交流增益為基礎,提出一種摻鉺光纖光放大器之參數萃取方法,可同時萃取出信號光之放射與吸收截面、泵激光之吸收截面、螢光壽命時間、鉺離子濃度以及泵激光與信號光之吸收係數。在應用摻鉺光纖光放大器時,可藉由此參數萃取方法來幫助系統的分析與設計。我們也對參數萃取過程中,ASE光功率影響的狀況,加以討論。
  接著,在光信號傳輸特性方面,本文探討多波道摻鉺光纖光放大器系統的失真及互調變特性,並藉由Volterra級數所導出的非線性富立葉轉換函數加以分析與研究。此轉換函數在計算過程中僅需要摻鉺光纖的一些基本參數來表示即可,使得摻鉺光纖光放大器的分析簡單許多。此外,我們也將所提出之轉換函數應用於WDM系統的交互調變失真,以及AM-SCM系統之互調變失真分析,計算結果與實驗相當吻合。
  再者,本文也探討摻鉺光纖光放大器在電場及磁場作用下,其輸出光信號的變化情形。發現光纖不太長時,以單模光纖與摻鉺光纖輸入端的連接點較易受溫度影響,增益變化為-0.023dB/ 。此外,文中也討論電磁干擾對光偵測系統的影響。
  This thesis presents simple methods to extract system parameters and to analyze the erbium-doped fiber amplifier (EDFA) for the applications of fibers to communications and sensor systems. First, a simple method to determine, in a quantitative way, the degree of the influence of ASE is presented. Through the study of the effect of ASE on EDFA gains, it is and found that the ASE can be neglected when the nearly-no-ASE factor (NNAF) is large enough. It is proposed as an ASE indicator. Furthermore, a formula for computing the error of output power due to the neglecting of ASE in calculation is also presented.
  Second, an EDFA parameter extraction method is proposed of obtaining simultaneously the pump absorption cross section, signal emission cross section and signal absorption cross section, the fluorescence lifetime of metastable level, the Er-ion concentration, and the pump and signal absorption coefficients. Based upon the measured dc and ac gains, these parameters can be obtained simultaneously without cutting the fibers or disassembling the EDFA system. They can be computed very easily by the use of our close-form expressions without complicated numerical method. The calculations are in good agree with experimental data.
  Then, the close-form expressions of nonlinear Fourier transfer functions are presented for the analyses of distortions and cross modulations in EDFA systems. Based upon Volterra series and the time-dependent perturbation theory, the transfer functions have been obtained after taking account of both the EDFA nonlinearity and chirping effect. Their applications to an AM-SCM and an eight-channel wavelength-division-multiplexed (WDM) systems are demonstrated.
  Moreover, the performance of the EDFA system in thermodynamically and electromagnetically harsher environments have been studied. It is found that the SMF-to-EDFA connection suffers the most from temperature effect when the fiber length is not long. The gain variation amounts to -0.023dB/ . Besides, the eletromagnetic interference effect on the photodiode and its light power and wavelength dependences are discussed.
封面
中文摘要
英文摘要
誌謝
目錄
圖表索引
第一章緒論
1.1前言
1.2光放大器之發展
1.3摻鉺光纖光放大器的基本原理
1.4摻鉺光纖光放大器的應用
1.5本論文之研究重點
第二章摻鉺光纖光放大器之ASE指標
2.1理論分析
2.2實驗架構
2.3結果與討論
2.4結論
第三章摻鉺光纖光放大器參數之線上萃取
3.1理論分析
3.2參數萃取之結果與討論
3.3ASE對於參數萃取的影響
3.4結論
第四章摻鉺光纖光放大器失真及互調變分析
4.1摻鉺光纖光放大器二次諧波失真
4.2非線性轉換函數分析
4.3AM-SCM系統
4.4WDM系統
4.5結論
第五章摻鉺光纖光放大器的操作環境影響
5.1摻鉺光纖光放大器的增益/光功率斜率
5.2光纖與光纖連接點間的溫度效應
5.3摻鉺光纖的溫度效應
5.4電場與磁場作用下的摻鉺光纖系統響應
5.5光受信器受電磁干擾之影響
5.6結論
第六章總結
參考文獻
作者著作
作者簡介
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