BURST MODE RARE EARTH-DOPED FIBER AMPLIFIER

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[PROBLEMS] To provide a rare earth-doped fiber the transient response of which is suppressed and an optical packet communication optical amplifier which has a good characteristic even if traffic is low. [MEANS FOR SOLVING PROBLEMS] An optical packet communication optical amplifier comprises a first rare earth-doped fiber (EDFA) having an active region the diameter of which ranges from 3.4 μm to 10 μm, an intermediate gain flattening filter, and a second EDFA. The first EDFA is shorter than the second EDFA. The intensities of the wavelength channels of the intermediate gain flattening filter are regulated so that the light intensities of the wavelength channels transmitted through the second EDFA may be equal to one another.