EDFA amplifier card is an optical amplifier module for the long-distance transmission system of digital optical fiber communication with dispersion devices. The core device uses a high reliability Pump laser, and adopts a unique APC (automatic power control) and ATC (automatic temperature control) circuit, which makes the output power stable and reliable. Professional design of GFF (gain flattening filter), with excellent optical path design, flatness and noise are optimized optimally.