We demonstrate a photonic RF Hilbert transformer for broadband microwave in-phase and quadrature-phase generation based on an integrated frequency optical comb, generated using a nonlinear microring resonator based on a CMOS compatible, high-index contrast, doped-silica glass platform. The high quality and 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.
@article{arxiv.1512.01741,
title = {Hilbert Transform based Quadrature Hybrid RF Photonic Coupler via a Micro-Resonator Optical Frequency Comb Source},
author = {Thach G. Nguyen and Mehrdad Shoeiby and Sai T. Chu and Brent E. Little and Roberto Morandotti and Arnan Mitchell and David J. Moss},
journal= {arXiv preprint arXiv:1512.01741},
year = {2015}
}