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We demonstrate a photonic radio frequency (RF) transversal filter based on anintegrated optical micro-comb source featuring a record low free spectral rangeof 49 GHz yielding 80 micro-comb lines across the C-band. This record-highnumber of taps, or wavelengths for the transversal filter results insignificantly increased performance including a QRF factor more than four timeshigher than previous results. Further, by employing both positive and negativetaps, an improved out-of-band rejection of up to 48.9 dB is demonstrated usingGaussian apodization, together with a tunable centre frequency covering the RFspectra range, with a widely tunable 3-dB bandwidth and versatile dynamicallyadjustable filter shapes. Our experimental results match well with theory,showing that our transversal filter is a competitive solution to implementadvanced adaptive RF filters with broad operational bandwidths, high frequencyselectivity, high reconfigurability, and potentially reduced cost andfootprint. This approach is promising for applications in modern radar andcommunications systems.

High performance photonic microwave filters based on a 50GHz optical soliton crystal Kerr micro-comb