Abstract: In one embodiment, a system includes a signal generator operable to generate a control waveform, an optical splitter operable to split light among first and second optical paths, and a detector in optical communication with the first optical path and operable to provide reference for the control waveform generation of the signal generator via the light of the first optical path. The system also includes an optical switch operable to attenuate a portion of the light of the second optical path based on the generated control waveform to detect a dynamic range signal.