Erbium-doped fiber amplifier (EDFA) is an optical repeater device that is used to boost the intensity of optical signals being carried through a fiber optic communications system. It is used in the telecommunications field and in various types of research fields. The EDFA carries from port 4 to 32 with power range from 16V to 19V per port. It has low noise co-efficient of about 0dbm input is lower than 4.5db and low CSO deterioration of less than -70dbc.It covers high stability and high reliability of MTBF > 100,000 hours.