Abstract
ABSTRACT The design of an optical amplifier based on an Er 3+ -doped chalcogenide microsphere evanescently coupled with a tapered optical fiber is illustrated. The physical phenomena as the main transitions among the erbium energy levels, the amplified spontaneous emission and the most important secondary transitions, pertaining to the ionion interactions, have been modeled in a 3D numerical code. The model is based on the coupled mode theory and the rate equations. The device has been designed and optimized by varying the fiber-microsphere gap, the thickness of erbium doped region, the fiber taper angle, the erbium concentration, the pump and signal powers. The simulation results highlight that the amplification system here proposed could be a good candidate to obtain a highly efficient and compact amplifier in mid-infrared wavelength range. Keywords: Microsphere, amplifier, tapered fiber, chalcogenide glasses 1. INTRODUCTION Recently, spherical microresonators are generating an increasi ng interest for their potential applications, essentially due to their unique characteristics
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