Abstract
A finite impulse-response microwave photonic filter is typically achieved based
on spectrum-shaped optical frequency combs and a dispersive element. We propose an
analytical model to describe the amplitude responses of the sidelobes. The model shows
that the sidelobe suppression ratio is limited by the spectrum structure of the optical
combs. By taking Gaussian-profiled combs as an example, it is both theoretically and
experimentally proved that the suppression ratio can be improved by optimizing the
spectral power range, which is defined as the ratio of the maximum tap weight to the
minimum tap weight.
© 2016 Chinese Laser Press
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