Highly versatile broadband RF photonic fractional Hilbert transformer based on a Kerr soliton crystal microcombs

Mengxi Tan, Xingyuan Xu, Andreas Boes, Bill Corcoran, Jiayang Wu, Thach G. Nguyen, St Chu, Brent Little, Arnan Mitchell, Arthur J. Lowery, Roberto Morandotti, David J. Moss

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6 Citations (Scopus)


We demonstrate an RF photonic fractional Hilbert transformer based on an integrated Kerr micro-comb source featuring a record low free spectral range of 49 GHz, yielding 75 microcomb lines across the C-band. By programming and shaping the comb lines according to calculated tap weights, we demonstrate that the Hilbert transformer can achieve tunable bandwidths ranging from 1.2 to 15.3 GHz, variable center frequencies from baseband to 9.5 GHz, and arbitrary fractional orders. We experimentally characterize the RF amplitude and phase response of the tunable bandpass and lowpass Hilbert transformers with 90 and 45-degree phase shift. The experimental results show good agreement with theory, confirming the effectiveness of our approach as a powerful way to implement the standard as well as fractional Hilbert transformers with broad and variable processing bandwidths and centre frequencies, together with high reconfigurability and reduced size and complexity.

Original languageEnglish
Pages (from-to)7581-7587
Number of pages8
JournalJournal of Lightwave Technology
Issue number24
Publication statusPublished - 15 Dec 2021


  • all-optical signal processing
  • Bandwidth
  • Hilbert transform
  • integrated optics
  • Kerr frequency comb
  • Optical device fabrication
  • Optical fibers
  • Optical films
  • Optical ring resonators
  • Optical solitons
  • Radio frequency

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