Abstract
The impact of Mach-Zehnder modulator (MZM) chirp on carrier suppressed double sideband (CS-DSB) radio over fiber (RoF) link is analyzed and simulated. Finite extinction ratio and drive signal unbalanced ratio of nonideal MZM are considered, power variation of targeted microwave signal and harmonic suppression are calculated and evaluated. The results show that drive signal unbalanced ratio could be optimized to minimize the power variation owing to the finite extinction ratio in the CS-DSB RoF link. However, harmonic suppress ratio declined rapidly with the decrease of extinction ratio, although the unbalanced ratio could also be adjusted to improve the harmonic suppression. For a nonideal modulator with low extinction ratio, unbalanced ratio could be optimized to overcome power penalty caused by finite extinction ration, while an additional filter is required to suppress the unwanted harmonic components in the CS-DSB RoF link.
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