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We demonstrate a photonic RF Hilbert transformer for broadband microwavein-phase and quadrature-phase generation based on an integrated frequencyoptical comb, generated using a nonlinear microring resonator based on a CMOScompatible, high-index contrast, doped-silica glass platform. The high qualityand large frequency spacing of the comb enables filters with up to 20 taps,allowing us to demonstrate a quadrature filter with more than a 5-octave (3 dB)bandwidth and an almost uniform phase response.

Hilbert Transform based Quadrature Hybrid RF Photonic Coupler via a Micro-Resonator Optical Frequency Comb Source