An all optical gain clamped and flattened fiber amplifier is reported. This technique is applicable for WDM networks with dynamic gain equalization of high gain, high power EDFAs. The dynamic range reaches 23 dB (-40~-17 dBm) for a constant 33 dB gain, while the -1 dB gain bandwidth is 14 nm (1547~1561 nm). The output signal power is 16 dBm.