Abstract

A photonic implementation of a practical broadband RF Hilbert transformer is demonstrated by using a four-tap transversal system. An almost ideal $90°$ phase shift with less than $3\mathrm{dB}$ of amplitude ripple has been achieved from 2.4 to $17.6\mathrm{GHz}$. 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.

© 2008 Optical Society of America

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