Mescia Luciano, Bia Pietro, De Sario Marco, Di Tommaso Annalisa, Prudenzano Francesco
DEE-Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, via E. Orabona 4, 70125 Bari - Italy.
Opt Express. 2012 Mar 26;20(7):7616-29. doi: 10.1364/OE.20.007616.
A dedicated 3D numerical model based on coupled mode theory and solving the rate equations has been developed to analyse, design and optimize an optical amplifier obtained by using a tapered fiber and a Er³⁺-doped chalcogenide microsphere. The simulation model takes into account the main transitions among the erbium energy levels, the amplified spontaneous emission and the most important secondary transitions pertaining to the ion-ion interactions. The taper angle of the optical fiber and the fiber-microsphere gap have been designed to efficiently inject into the microsphere both the pump and the signal beams and to improve their spatial overlapping with the rare earth doped region. In order to reduce the computational time, a detailed investigation of the amplifier performance has been carried out by changing the number of sectors in which the doped area is partitioned. The simulation results highlight that this scheme could be useful to develop high efficiency and compact mid-infrared amplifiers.
已开发出一种基于耦合模理论并求解速率方程的专用三维数值模型，用于分析、设计和优化一种通过使用锥形光纤和掺铒硫系微球获得的光放大器。该仿真模型考虑了铒能级之间的主要跃迁、放大的自发辐射以及与离子 - 离子相互作用相关的最重要的二级跃迁。设计了光纤的锥角和光纤 - 微球间隙，以便有效地将泵浦光和信号光束注入微球，并改善它们与稀土掺杂区域的空间重叠。为了减少计算时间，通过改变掺杂区域划分的扇区数量，对放大器性能进行了详细研究。仿真结果表明，该方案对于开发高效且紧凑的中红外放大器可能是有用的。
