本論文主要分三個部份討論：第一部份為模擬單向傳輸去回放大式之寬頻譜混成摻鉺光纖放大器/拉曼光纖放大器之研製，利用單一波長之泵激雷射光源與泵激分配機制達到寬頻譜放大，同時利用高反射率泵激反射元件達到殘餘功率再利用；再者，透過一個光循環器與分波多功元件將C頻帶與L頻帶光信號分離，由不同路徑進入混成光纖放大器，並由不同波長的光纖光柵反射，形成去回放大式架構，增益等化後可獲得20±0.5 dB的增益，平均雜訊指數為6.5 dB，並且於10 Gb/s × 14 頻道，且傳輸100公里的系統中，利用由光纖光柵與不同長度的色散補償光纖交錯而成的色散補償模組達到精確的色散補償。
第二部份為模擬雙向傳輸去回放大式混成摻鉺光纖放大器/拉曼光纖放大器之研製，設計理念與第三章架構相似，不同之處如下：(1)應用於雙向傳輸系統；(2)調整泵激雷射波長拓展增益頻寬；(3)簡化泵激分配機制；而本章設計之混成光纖放大器於增益等化後C頻帶與L頻帶分別獲得20±0.5 dB與16.5±0.5 dB的增益，平均雜訊指數分別為5.1 dB與7.8 dB；並且量測應用於10 Gb/s×25頻道，傳輸50公里的系統中之Q值，其平均Q值由2.9提昇至6.4。
第三部份為實作之研究，討論去回放大式混成光纖放大器所面臨的受激布里淵散射問題；並於實驗中透過不同泵激架構與調整光纖光柵反射率提高受激布里淵散射之臨界泵激功率值，C頻帶波長1552 nm的測試光信號可承受泵激功率（總功率）由266 mW提高為303 mW，而L頻帶波長為1581 nm的測試光信號可承受泵激功率則由237 mW提昇為260 mW。

This thesis is divided into three parts: in the first part we simulate unidirectional, broadband (signals) double-pass hybrid EDFA/RFA amplifiers (HFAs). Initially, we use the single-wavelength pump laser diode and pump-sharing mechanism to design the broadband HFAs, and also utilize the high-reflectivity pump reflector to reuse the residual pump power. When signals launch into HFAs, we can separate the C-band channels and L-band channels by using an optical circulator and a C/L WDM coupler. Signals double-pass scheme would be realized by using FBGs locate in the midway of dispersion compensation fiber (DCF). For gain equalization issue, we adjust the reflectivity of FBGs with specific wavelengths to obtain an average gain of 20±0.5 dB. At the same time, the average noise figure is 6.5 dB. In order to achieve a precisely dispersion compensation in a 100 km access network, we put dispersion compensation module (DCM) with several FBGs with various reflectivity and be written at different locations of along the DCF. The second part is to simulate the bidirectional, broadband (signals) double-pass HFAs. Comparing with the unidirectional HFAs, there different concepts are: (1) The bidirectional HFAs may apply in bidirectional transmission system; (2) One may extend the gain-bandwidth to longer region of the L band if an 1495 nm pump laser diode is used; (3) Pump sharing mechanism is simplified. For the gain equalization issue, the average gain of 20±0.5 dB at the C-band and 16.5±0.5 dB at the L-band are obtained. The average noise figures are 5.1- and 7.8 dB for the C and L bands, respectively. We also measure 10Gb/s x 25 WDM channels in 50 km transmission using the HFAs. The average Q value is improved from to 6.4 from 2.9.The third part is experimental study the possible simulated Brillouin scattering (SBS) induces impact to double-pass HFAs. SBS threshold could be increased after designed appropriate pump structures and adjust the reflectivity of FBGs. Therefore, the total lunch pump power may increase for C-band channel at 1552 nm and for L-band channel at 1582 nm simultaneously by avoiding the SBS impact.

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