Theoretic characteristics of Er3+-Yb3+ co-doped phosphate glass waveguide amplifier are studied by resolving rate-propagation equations with overlapping integral method. Considering the effect of the up-conversion and ASE, the amplifier gain and ASE spectrum are obtained. The relations between the amplifier gain and several parameters are analyzed, such as the waveguide length, pump power, up-conversion coefficient, propagation loss and so on. The experiment result agrees well with the numerical result.
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