Abstract
We investigated theoretically and experimentally a microwave/millimetre-wave optical harmonic upconverter based on a single Mach–Zehnder electro-optical modulator (MZ-EOM). Biasing at quadrature and non-linear operating points as well as comparison with the traditional cascaded approach is considered. This optical mixing technique provides a lower optical insertion loss at a lower cost than the traditional cascaded optical modulator mixing approach as well as similar conversion loss and isolation performance. A BER of less than 10-9 is achieved using this single MZ-EOM upconversion scheme in the quadrature and minimum transmission bias points for a 50 km single mode fibre transmission of a 34 Mbits/s PRBS signal, demonstrating that this approach is suitable for broadband applications in the millimetre-wave band.
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