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S-band Tm3+/Yb3+ codoped tellurite fiber amplifier pumped by a 980nm laser diode is proposed and modeled taking into consideration of the energy transfer process from Yb3+ to Tm3+ and the laser cavity inside a codoped fiber amplifier. S-band spectral gains for the codoped fiber amplifiers are investigated. The results show that considerable gain improvement can be achieved by constructing 1050 nm laser cavity inside the amplifier. (c) 2006 Optical Society of America.