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Opt Lett. 2011 Nov 15;36(22):4440-2. doi: 10.1364/OL.36.004440.

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

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  • 1School of Electrical and Information Engineering, Institute of Photonics and Optical Science, The University of Sydney, Sydney, New South Wales 2006, Australia.


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°.

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