This article focuses on analyzing the effects that occur in the downlink of XGS-PON architecture at 10Gbps speed, implementing two different Raman fiber amplifiers (RFA), in order to determine the appropriate amplifier configuration, considering the performance of the optical system can be significantly degraded by the power penalties in presence of non-linear phenomena, such as self-phase modulation (SPM). This type of amplifier is considered the future of optical communications, due to its high power handling to achieve great distances required by the new generation architectures proposed by FSAN.