The gain flattening of EDFA is a key issue in DWDM system. The realization technology principle of EDFA gain flattening filter is introduced and its key technical parameters are compared. It is considered that chirped grating gain flattening filter is a better choice. Experiments show that by adding chirped grating gain flattening filter to high power EDFA, its gain flatness can be controlled within ±0.3dB.
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