Abstract
A scheme to generate ultra-wideband (UWB) pulses is presented and demonstrated. The key characteristic is that two paralleled Mach–Zehnder modulators are employed. The two Mach–Zehnder modulators are biased at full point and null point, respectively. By adjusting time delay difference between the output optical pulses at two Mach–Zehnder modulators, the UWB pulses can be generated. Firstly, theoretical analysis of this method is done; then, we verify the approach by simulation with commercial software. The results show that three category UWB pulses can be obtained as follows: Gaussian doublet pulse, negative Gaussian monocycle pulse and positive Gaussian monocycle pulse. The RF spectrum fulfill Federal Communication Commission (FCC) requirement.
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