hi all,
EDFAs have a wavelength-dependent gain; i.e., some wavelengths are amplified more than others. A gain flattening filter restores all wavelengths to approximately the same intensity.
a practical example can be an linear chirped fiber grating(LcFBG) not operating in saturation mode…where every wavelength is replected as per our need.we can tune the chirp or length of FBG as per our need.
with regards