Abstract
We propose a novel scheme to implement tunable multi-tap complex coefficient filters based on optical single sideband modulation and narrow band optical filtering. A four tap filter is experimentally demonstrated to highlight the enhanced tuning performance provided by complex coefficients. Optical processing is performed by the use of a cascade of four phase-shifted fiber Bragg gratings specifically fabricated for this purpose.
Highlights
Much research has been recently devoted to overcome the inherent limitations of positive-coefficients incoherent microwave photonics filters developing schemes to provide negative and full complex-coefficient filters [1,2,3,4,5,6,7,8,9]
As it was shown above, the low frequency operation of the RF phase-shifter is limited by the linewidth of the phase-shifted fiber Bragg gratings (PS-FBG) notch, which in this case is around 5 GHz
A novel technique based on optical single-sideband (OSSB) modulation and PS-FBGs for the implementation of complex-coefficient microwave photonic filters has been demonstrated
Summary
Much research has been recently devoted to overcome the inherent limitations of positive-coefficients incoherent microwave photonics filters developing schemes to provide negative and full complex-coefficient filters [1,2,3,4,5,6,7,8,9]. We have recently introduced an all-optical implementation of a two-tap complex-coefficient microwave photonic filter working under incoherent operation [6]. We have generalized this scheme to built multi-tap complex coefficient filters demonstrating that the technique can be scaled [8]. These are complex schemes because they require additional devices to generate the optical waves involved and rather high optical powers to pump the nonlinear interaction
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