In this paper, a novel low-noise erbium-doped fiber amplifier(EDFA) is proposed,which is based on an optical interleaver whose input port is connected with the conventional erbium-doped fiber amplifier directly for noise reduction, and the even port is utilized to export the amplified signals.By utilizing the comb like reflection spectrum of the optical interleaver to suppress the amplifier spontaneous emission(ASE), the noise figure(NF) of the EDFA decreases to a large extend compared with conventional EDF...