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The Variable 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.