The EMCORE MAFA 5000 Series of Erbium Doped Fiber Amplifiers (μEDFA) are ideal building blocks for OEM systems integration where there is a requirement to amplify a 1550 nm signal for a broad range of applications including CATV systems, RF/microwave fiber optic links, sensing and control systems, and more. The MAFA 5000 series EDFA gain blocks provide input and output optical isolation for stable, low noise operation. The input and output optical signals are detected for monitoring and control. The input optical signal is amplified with active gain control for a constant output power level or with active output power control for constant gain mode operation.