本論文採用同向幫浦架構，幫浦光源為915nm，模擬core pumping與cladding pumping幫浦方式，976nm摻鐿光纖放大器，在本文中推導出適用於core pumping與cladding pumping時態式與穩態光纖放大器的模擬計算公式。對於core pumping光纖放大器而言，我們分別使用了976nm CW與脈衝兩種作為訊號源，在模擬過程中我們找到了最佳化dBL值，以便我們找出最佳化增益光纖長度，並且驗證了脈衝式光纖放大器可以直接擬合CW光纖放大器的放大特性。對於cladding pumping光纖放大器而言，我們只使用了976nm CW作為訊號源，透過模擬結果我們提出兩種方法可以提升cladding pumping光纖放大器的放大特性。

The purpose of the study is to simulate and numerically analyze the 976nm ytterbium-doped fiber amplifiers using core and cladding pumping on forward pumping framework, and 915nm as pump source. In the thesis, we respectively derive appropriate equations for modeling fiber amplifiers in time-dependent state and steady state. For 976nm CW and pulsing fiber amplifiers using core pumping, we have found out the optimal dBL so that the optimization length of gain fiber can be known. Also, we have demonstrated that the CW fiber amplifiers are matching the amplification property of the pulsing fiber amplifiers. For 976nm CW fiber amplifiers using cladding pumping, we have pointed out two methods to raise the amplification of 976nm CW fiber amplifiers by simulation results.

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