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We demonstrate photonic RF phase encoding based on an integrated
micro-comb source. By assembling single-cycle Gaussian pulse replicas using a
transversal filtering structure, phase encoded waveforms can be generated by
programming the weights of the wavelength channels. This approach eliminates
the need for RF signal generators for RF carrier generation or arbitrary waveform generators for
phase encoded signal generation. A large number of wavelengths—up to 60—were provided by
the microcomb source, yielding a high pulse compression ratio of 30. Reconfigurable
phase encoding rates ranging from 2 to 6 Gb/s were achieved by
adjusting the length of each phase code. This work demonstrates the significant potentials
of this microcomb-based approach to achieve high-speed RF photonic phase
encoding with low cost and footprint.