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We propose and experimentally demonstrate a microwave photonic intensitydifferentiator based on a Kerr optical comb generated by a compact integratedmicro-ring resonator (MRR). The on-chip Kerr optical comb, containing a largenumber of comb lines, serves as a high-performance multi-wavelength source forimplementing a transversal filter, which will greatly reduce the cost, size,and complexity of the system. Moreover, owing to the compactness of theintegrated MRR, frequency spacings of up to 200-GHz can be achieved, enabling apotential operation bandwidth of over 100 GHz. By programming and shapingindividual comb lines according to calculated tap weights, a reconfigurableintensity differentiator with variable differentiation orders can be realized.The operation principle is theoretically analyzed, and experimentaldemonstrations of first-, second-, and third-order differentiation functionsbased on this principle are presented. The radio frequency (RF) amplitude andphase responses of multi-order intensity differentiations are characterized,and system demonstrations of real-time differentiations for a Gaussian inputsignal are also performed. The experimental results show good agreement withtheory, confirming the effectiveness of our approach.

Photonic radio frequency and microwave intensity differentiator based on an optical frequency comb source in an integrated micro-ring resonator