We have proposed and demonstrated a double-pass ytterbium-doped fiber amplifier using an optical circulator and a fiber Bragg grating as reflector. When the signal has passed through the ytterbium-doped fiber once, it reflects off a 0.2-nm passive fiber Bragg grating filter. This reduces amplified spontaneous emission (ASE) noise from the first pass. The input signal light is amplified both forward and backward through ytterbium-doped fiber. With this double-pass configuration, 1053.15-nm unsaturated signal gain of 28 dB, gain coefficient of 1.1 dB/mW, and noise figure of less than 4 dB are achieved at 977-nm pump power of 68 mW. It is also found that this double-pass configure provides enhancing gain coefficient and improving noise figure by comparison with single-pass configuration. We have proposed and demonstrated a double-pass ytterbium-doped fiber amplifier using an optical circulator and a fiber Bragg grating as reflector. When the signal has passed through the ytterbium-doped fiber once, it reflects off a 0.2-nm passive fiber Bragg grating This doubled-pass emission (ASE) noise from the first pass. The input signal light is amplified both forward and backward through the ytterbium-doped fiber. With this double-pass configuration, the 1053.15-nm unsaturated signal gain of 28 dB, gain coefficient of 1.1 dB / mW, and noise figure of less than 4 dB are achieved at 977-nm pump power of 68 mW. It is also found that double-pass configure provides enhancing coefficient and improving noise figure by comparison with single- pass configuration.