We investigate a novel technique to generate the transmission signal in digital-microwave link applications. This technique is based on a photonic device that achieves both electrical modulation (QAM, PSK, ASK) and harmonic upconversion of the microwave carrier. Simulation results are provided for a seventh-harmonic 38.5-GHz transmission of a 2.5-Gbps signal through a 1-km fiber span. The impact of fiber chromatic-dispersion on the link bandwidth is also analyzed.
P. Candelas, J. M. Fuster, J. Marti, and J. C. Roig, "Optically Generated Electrical-Modulation Formats in Digital-Microwave Link Applications," J. Lightwave Technol. 21, 496- (2003)