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Opt Lett. 2008 Jan 15;33(2):98-100.

Wideband RF photonic in-phase and quadrature-phase generation.

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Microelectronics and Materials Technology Center, School of Electrical and Computer Engineering, RMIT University, GPO BOX 2476V, Melbourne, 3001, Victoria, Australia.


A photonic implementation of a practical broadband RF Hilbert transformer is demonstrated by using a four-tap transversal system. An almost ideal 90 degrees phase shift with less than 3 dB of amplitude ripple has been achieved from 2.4 to 17.6 GHz. An efficient method to realize both transformed (quadrature-phase) and reference (in-phase) signal has been achieved by using a coarse wavelength division multiplexing coupler. Extension of the transformer bandwidth and further improvements of its implementation are discussed.

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