Relationship between gain and Yb 3¿ concentration in Er 3¿ -Yb 3¿ doped waveguide amplifiers
Relationship between gain and Yb 3¿ concentration in Er 3¿ -Yb 3¿ doped waveguide amplifiers
复制标题
DOI：
10.1063/1.1406550
复制
发表时间：
2001-10
期刊：
影响因子：
--
通讯作者：
C. Strohhöfer;A. Polman
中科院分区：
文献类型：
--
作者：
C. Strohhöfer;A. Polman
利用同向泵浦的掺Er~(3+)/Yb~(3+)Al_2O_3光波导放大器980 nm的速率方程传输模型，研究了增益与Yb~(3+)浓度的关系。该模型包括了Er3+内激发态吸收和能量转移上转换过程以及Yb3+和Er3+之间相应的能量转移过程。计算结果表明，参数增益、泵浦功率、波导长度和Yb3+浓度之间有密切的关系。对于这些参数的所有组合，选择合适的Yb3+浓度共掺杂可以增加约1530 nm的增益。当泵浦功率在放大器阈值附近时，Yb3+共掺杂对增益的改善最大。在高泵浦功率下，掺Er~(3+)/Yb~(3+)光波导比掺Er~(3+)光波导增益增加不大。此外，对于每个发射的泵浦功率，可以确定一个非零的Yb3+浓度，从而最大化增益。
We have used a rate equation propagation model of an Er3+/Yb3+ doped Al2O3 waveguide amplifier with copropagating pump at 980 nm to investigate the dependence of gain on Yb3+ concentration. The model includes excited state absorption and energy transfer upconversion processes within the Er3+ as well as the relevant energy transfer processes between Yb3+ and Er3+. The results of the calculations indicate a close relationship of the parameters gain, launched pump power, waveguide length, and Yb3+ concentration. Codoping with a well-chosen Yb3+ concentration is shown to increase the gain around 1530 nm for all combinations of these parameters. The gain is improved most by Yb3+ codoping at pump powers around the amplifier threshold. At high pump powers the increase in gain of an Er3+/Yb3+ doped waveguide is insignificant compared to that of its Er3+ doped counterpart. Furthermore for each launched pump power, a nonzero Yb3+ concentration can be determined, which maximizes the gain.