Abstract
Inthiswork,amodelforanalyzingthegaincharacteristicsofheavilyEr 3+ /Yb 3+ co-doped compactfiber amplifier is presented. Four-level rate equations andfinite-difference beam propagation method are applied to simulate the optical field evolution along the active fiber. Based on this model, the influences of ion concentration, fiber length and pump power on the gain characteristics of Er 3+ /Yb 3+ co-doped phosphate glass fiber amplifiers are the- oretically investigated. Numerical results show that for a fiber length of 3.6cm the internal gain can reach 27.2dB with NEr = 2.6 × 10 26 ions/m 3 and NYb = 1.2 × 10 27 ions/m 3 when pumped with 224mW at 980nm. The gain per centimeter is 7.56dB/cm. The results can provide useful information to optimize the gain performance of these compact fiber
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