## Abstract

A numerical model of a ${\mathrm{Pr}}^{3+}$-doped low-phonon-energy fiber pumped with 488, 980, and 1480 nm lasers is presented to explore the possibility for simultaneous 1300, 1490, and $1600\text{\hspace{0.17em}}\mathrm{nm}$ band amplification for the first time, to the best of my knowledge. The rate and power propagation equations of the model are solved numerically and the dependence of the gains at the three bands on pump power and input signal power are calculated. The results predict that, with 488, 980, and 1480 nm pump power of 100, 12, and 1.5 mW, and with ${\mathrm{Pr}}^{3+}$ concentrations of $1.2\times {10}^{25}\text{\hspace{0.17em} ions}/{\mathrm{m}}^{3}$, the signals around 1300, 1490, and $1600\text{\hspace{0.17em}}\mathrm{nm}$ can be equally amplified with a gain of $21.0\mathrm{dB}$ in the active fiber with a length of $6.0\text{\hspace{0.17em}}\mathrm{m}$.

© 2008 Optical Society of America

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