Gain Tilting Filter (VGTF) provides Wavelength Division Multiplexing (WDM)
gain equalization and tilting for optical amplifiers with either a tilted
or a parabolic profile. The Dynamic Gain Flattening Filter (DGFF), based
on a harmonic filter design, dynamically smoothes out any non-linearity
in optical amplifier gain curves and allows power equalization for DWDM
systems at a lower resolution.