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International Journal of Optics
Volume 2012, Article ID 808679, 5 pages
Research Article

Modeling of Mid-IR Amplifier Based on an Erbium-Doped Chalcogenide Microsphere

Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, Via E. Orabona, 4-70125 Bari, Italy

Received 2 March 2012; Accepted 30 May 2012

Academic Editor: Francesco Prudenzano

Copyright © 2012 P. Bia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An optical amplifier based on a tapered fiber and an Er3+-doped chalcogenide microsphere is designed and optimized. A dedicated 3D numerical model, which exploits the coupled mode theory and the rate equations, is used. The main transitions among the erbium energy levels, the amplified spontaneous emission, and the most important secondary transitions pertaining to the ion-ion interactions have been considered. Both the pump and signal beams are efficiently injected and obtained by a suitable design of the taper angle and the fiber-microsphere gap. Moreover, a good overlapping between the optical signals and the rare-earth-doped region is also obtained. In order to evaluate the amplifier performance in reduced computational time, the doped area is partitioned in sectors. The obtained simulation results highlight that a high-efficiency midinfrared amplification can be obtained by using a quite small microsphere.