Numerical modelling and experimental investigation of double-cladding erbium–ytterbium-doped fibre amplifiers
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- Sorbello, G., Taccheo, S. & Laporta, P. Optical and Quantum Electronics (2001) 33: 599. doi:10.1023/A:1011081225269
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A comprehensive model for characterising double-cladding erbium–ytterbium-doped fibre amplifiers (EYDFAs) is proposed and experimentally verified for the first time to our knowledge. The model is based on rate and propagation equations in a homogeneous two-level active medium and takes into account the modified pump absorption arising from the double-cladding structure and the presence of ytterbium ions. The influence of the cladding pumping scheme on the multimode pump absorption, radial population inversion and the amplified spontaneous emission are also modelled. The numerical mode is capable to predict amplifier gain, output spectra, gain saturation and amplifier noise. The model has been fully validated in a large number of operating conditions and a fairly good agreement is obtained between the experimental data and the numerical simulations over a wide range of input parameters.