title: Microwave photonic quadrature filter based on an all-optical programmable Hilbert transformer.
abstract: A microwave photonic quadrature filter, new to our knowledge, based on an all-optical Hilbert transformer is presented. It is based on mapping of a Hilbert transform transfer function between the optical and electrical domains, using a programmable Fourier-domain optical processor and high-speed photodiodes. The technique enables the realization of an extremely wide operating bandwidth, tunable programmable bandwidth, and a highly precise amplitude and phase response. Experimental results demonstrate a microwave quadrature filter from 10 to 20 GHz, which achieves an amplitude imbalance of less than ±0.23 dB and a phase imbalance of less than ±0.5°.
authors.affiliation: School of Electrical and Information Engineering, Institute of Photonics and Optical Science, The University of Sydney, Sydney, New South Wales 2006, Australia. thomas.huang@sydney.edu.au
authors.forename: Thomas X H
authors.initials: TX
authors.lastname: Huang
authors.forename: Xiaoke
authors.initials: X
authors.lastname: Yi
authors.forename: Robert A
authors.initials: RA
authors.lastname: Minasian