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Opt Lett. 2003 Aug 15;28(16):1415-7.

Microwave photonic filters with negative coefficients based on phase inversion in an electro-optic modulator.

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Grupo de Comunicaciones Opticas, Departamento de Comunicaciones and IMCO2 Research Institute, Universidad Polit├ęcnica de Valencia, Camino de Vera s/n. 46021, Valencia, Spain.


We report on a novel technical approach to the implementation of photonic rf filters that is based on the pi phase inversion that a rf modulating signal suffers in an electro-optic Mach-Zehnder modulator, which depends on whether the positive or the negative linear slope of the signal's modulation transfer function is employed. Experimental evidence is provided of the implementation of filters with negative coefficients that shows excellent agreement with results predicted by the theory.


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