王倫臺灣大學：光電工程學研究所游家瑋You, Gia-weiGia-weiYou2007-11-252018-07-052007-11-252018-07-052004http://ntur.lib.ntu.edu.tw//handle/246246/50878我們修改了測量摻鉺光纖截面積的方法，獲得了摻鉺光纖吸收和放射的截面積。我們先利用剪掉一段摻鉺光纖的方法，量得吸收和放射係數。再利用這些係數和複行後向超螢光光纖光源的模擬，得到摻鉺光纖的濃度。並利用這些量得的數值來模擬複行後向架構的一些性質，及將複行後向架構的平均波長在泵激波長和功率變動下的穩定性最佳化。我們也做了一些實驗來比照模擬的結果。 在將複行後向架構的參數最佳化後，研究其極化不穩定性。然後利用去極化器來解決極化不穩定的問題。我們提出了一個新架構，此架構和之前的不同為第一個去極化器的位置。經過測量之前的架構和新的架構其極化穩定性後，結果顯示新的架構是更有效率的。之後，我們測量溫度和平均波長的關係，並研究了一個較經濟的、不需溫度控制的複行後向架構超螢光光纖光源其計算出來的和實際的平均波長的誤差。We use a modified and simpler method to obtain the absorption and emission cross sections of an Erbium-doped fiber. The cutback technique is used to obtain absorption and emission coefficients. Erbium ions concentration is obtained by the information of measured coefficients along with modeling of double-pass backward (DPB) superfluorescent fiber source (SFS). The obtained data are then used to simulate some properties of a DPB SFS. The mean wavelength of DPB SFS is optimized to be stable with respect to pump power and pump wavelength variations. Experimental results are compared to the simulation. We use the optimized parameters to characterize the polarization instability of a DPB SFS. Depolarizers are used to solve the polarization instability. We proposed a novel scheme in which the position of first depolarizer is different from the one published previously. The polarization stabilities in this novel and previous schemes are measured, and the results show that the scheme we propose is more efficient. The relations between temperature and mean wavelength are measured. A cost-effective DPB SFS without temperature control is demonstrated, and the deviation of calculated and measured mean wavelength is presented.Contents 摘要……………………………………………………...I Abstract………………………………………………..II Contents………………………………………………III List of Figures………………………………………V List of Tables…………………………………………VIII List of Symbols………………………………………IX Chapter 1 Introduction……………………………1 1-1 Fiber Optic Gyroscope………………………………1 1-2 Requirements of a Light Source for an FOG…1 1-3 Configurations of SFS’s…………………………4 1-4 Temperature and Polarization Effect on Mean-Wavelength Stability…………………….…………………..5 1-5 Organization of This Thesis……………………7 Chapter 2 Estimation of Erbium-Doped Fiber Cross Section…….........................................11 2-1 Measurement of EDF Absorption and Emission Coefficients…………………………………….…………...12 2-1-1 Methods to Measure Cross Section……..12 2-1-2 Measurement of Absorption and Gain Coefficients………………………………………………....14 2-2 Modeling of DPB SFS……………………………16 2-3 Estimation of EDF Cross Section and Optimization of DPB SFS……………………………………………….………21 2-3-1 Determination of Er3+ Concentration…21 2-3-2 Optimization of the DPB SFS……………23 2-4 Summary……………………………………………..26 Chapter 3 Polarization-Stable and Cost-effective DPB SFS…………………………………53 3-1 Lyot Depolarizer………………………………...53 3-2 Polarization Effects on Mean-Wavelength Stability ………………………………………………………56 3-3 Cost-effective DPB SFS without Temperature Control………………………………………………...……..59 3-4 Summary………………………………………………60 Chapter 4 Conclusion and Future Work…………........76 4-1 Conclusion……………………………………………76 4-2 Future Work………………………………………….77 References…………………………………………….........79779373 bytesapplication/pdfen-US摻鉺光纖去極化器超螢光光纖光源Er-doped fibersuperfluorescent fiber sourcedepolarizerthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/50878/1/ntu-93-R91941026-1.pdf