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Abstract

This paper proposes a radio-over-fiber system which employs a frequency multiplier scheme to generate optical millimetre wave (MMW) based on external modulation performed using two cascaded Mach-Zehnder modulators. By adjusting the direct current bias voltages of intensity modulator, modulation voltage and phase, the frequency quadrupling optical MMW signal is generated. The performance of the scheme is verified by transmitting the signal along the fiber over a distance of 40 km in terms of bit error rate (BER) performance and received power. The eye diagram is wide open and BER values are low for a data rate of 2.5 Gbps.