Tradeoff on gain-flatness and gain-stabilization of erbium doped fiber amplifier with FBGs

It is a challenge to get gain-stabilization and gain-flatness of erbium doped fiber amplifier (EDFA) in C-band, simultaneously. In this article, we establish a gain-clamped EDFA model based uniform fiber grating-pair and optimize the reflectivity of grating by the designed targets. The tradeoff between stabilization and flatness can be obtained when an ideal reflectivity is adopted. The numerical results show that the gain-stabilization is controlled in ±0.1dB and gain-flatness is less than ±1.41dB in the range from 1535nm to 1565nm.