The IQS-6100 Erbium-Doped Fiber Amplifier (EDFA) is part of the IQS-500 Intelligent. Test System, EXFO s unmatched modular-concept test unit. The addition of an optical amplifier offers considerable flexibility to a WDM active component test setup. Use the EDFA to investigate non-linear effects such as four-wave mixing, or to calibrate and verify power meters, photodetectors and attenuators at high power levels.