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Opt Lett. 2008 Jun 15;33(12):1294-6.

Generation of pure electrical quadrature amplitude modulation with photonic vector modulator.

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  • 1Valencia Nanophotonics Technology Center, Universidad Polit├ęcnica de Valencia, Valencia, Spain.


A photonic vector modulator architecture for generating pure quadrature amplitude modulation (QAM) signals is presented. An electrical quadrature-modulated signal at microwave-millimeter-wave frequencies is generated from its corresponding baseband in-phase (I) and quadrature (Q) components. In the proposed scheme, no electrical devices apart from the electrical tone oscillator are needed in the generation process. In addition, the purity of the generated signal is increased, and the hardware requirements are reduced when compared with previously proposed architectures so a highly compact low-cost architecture can be implemented. A pure 1.25 Gbit/s 4-QAM signal has been experimentally generated at a 42 GHz carrier frequency.

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