Based on a two stage fiber, Erbium doped fiber amplifiers (EDFAs) pumped by 980 nm and 1480 nm laser diodes (LD) are investigated. Experimental comparisons of gain, noise figure and output power between the intermediate isolator configuration and the loop coupling configuration are discussed. A small signal gain of 42.8 dB of EDFA has been obtained for the loop coupling configuration. The minimum noise figure and maximum output power at wavelength of 1553.5 nm are 4.4 dB and 15.2 dBm, respectively.