Abstract
We demonstrate a photonic RF integrator based on an integrated
soliton crystal micro-comb source. By multicasting and progressively
delaying the input RF signal using a transversal structure, the input RF
signal is integrated discretely. Up to 81 wavelengths are provided by
the microcomb source, which enable a large integration time window of
~6.8 ns, together with a time resolution as fast as
~84 ps. We perform signal integration of a diverse range
of input RF signals including Gaussian pulses with varying time widths,
dual pulses with varying time intervals and a square waveform. The
experimental results show good agreement with theory. These results
verify our microcomb-based integrator as a competitive approach for RF
signal integration with high performance and potentially lower cost and
footprint.