Abstract: The erbium doped fiber amplifier (EDFA) gain flattening filters were fabricated by writing chirped fiber Bragg gratings on hydrogen-lo aded standard fiber with chirped phase mask and a properly designed program cont rolled scanning exposure system. The gain variation in an EDFA is within ±0.3 dB over bandwidth of 30 nm. The gain flattening filters based on chirped fiber B ragg gratings can be designed and fabricated according to the different ASE spec trum of EDFA.

Key words: chirped fiber Bragg grating, erbium doped fiber amplifi er, gain flattening filter, gain flattening variation