掺Er3+Al2O3平面光波导放大器理论计算

利用速率方程模型，通过求稳态解，比较了1480、980、820nm3种波长泵浦时的掺Er^3 Al2O3平面光波导放大器的增益与泵浦功率和掺铒浓度的关系。在确定的泵浦功率下，存在最佳掺铒浓度，可得到最大增益，并且泵浦功率增大，最佳掺铒浓度也增大。同时分析了激发态吸收和合作上转换对增益的影响；高功率泵浦时，激发态吸收对增益的影响明显，高浓度Er^3 时，合作上转换对增益的影响显著，并提高了放大器阈值泵浦功率。

Theoretical calculation of Er3+ doped Al2O3 waveguide amplifier

The gain characteristics of Er3+ doped Al2O3 spiral waveguide amplifi er are theoretically obtained using steady-state rate equations. The dependence of gain on pump power and Er3+ concentration is depicted respectively pum ping at 1 480 nm, 980 nm, 820 nm. It is shown that for certain pump power, an op timum Er3+ concentration exists corresponding to the maximum possible gain . The effect of excited state absorption and cooperative upconversion on optical gain is analyzed. At high pump power, the effect of ESA is great and the effect of CUC is remarkable at high Er3+ concentration. By comparison, 980 nm pu mping is more efficient.