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Microwave photonic quadrature filter based on an all-optical programmable Hilbert transformer

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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 20GHz, which achieves an amplitude imbalance of less than ±0.23dB and a phase imbalance of less than ±0.5°.

© 2011 Optical Society of America

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