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Integrated Kerr microcombs are emerging as a powerful tool as sources ofmultiple wavelength channels for photonic RF and microwave signal processingmainly in the context of transversal filters. They offer a compact devicefootprint, very high versatility, large numbers of wavelengths, and wideNyquist bands. Here, we review recent progress on Kerr microcomb-based photonicRF and microwave reconfigurable filters, based both on transversal filtermethods and on RF to optical bandwidth scaling. We compare and contrast resultsachieved with wide comb spacing combs (200GHz) with more finely spaced (49GHz)microcombs. The strong potential of optical micro-combs for RF photonicsapplications in terms of functions and integrability is also discussed.

Comparison of photonic transversal RF spectral filters based on different optical microcombs