"Temperature dependent modelling of cladding–pumped Er3+–Yb3+–codoped fiber amplifiers for space applications" by Luciano Mescia

Seminar by Luciano Mescia, Politecnico di Bari - Department of Electrical and Information Engineering

Abstract

In recent years, the space industry has shown an increasing interest for Er3+–doped fiber amplifiers (EDFAs) and  lasers to address new satellite architectures and sub-system applications. In the contest of space optical communications the fiber amplifier should be able to provide a stable output signal power of several watt over a long-term space missions. Due to the various nonlinearity impairments the high power requirement is difficult to satisfy by using EDFA. Moreover, in the space radiation environment the long-term EDFA characteristics will be deteriorated by RIA. Accurate theoretical and numerical modelling of EDFAs is an invaluable tool i) to meet the increasingly needs of different space applications, ii) to evaluate the suitable amplifier configuration for controlling unwanted degradation mechanism due to the fiber exposition to ionizing radiation (electrons, protons, X-rays, g-rays), iii) to correctly predict the amplifier performance in terms of efficiency and power scaling capability. Starting from these considerations, a comprehensive numerical model combining the 3-D non-homogeneous heat conduction equation with Maxwell’s and nonlinear rate equations is illustrated. The most relevant active phenomena, 3-D thermal lensing, temperature dependence of emission and absorption cross sections and complex 3-D thermal sources are modelled. Many examples will be illustrated with the aim to demonstrate the feasibility of the model to provide  reliable qualitative and quantitative predictions for the design and optimization of the amplifier performance in a large
variety of configurations.

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