Abstract
A simple and tunable photonic approach for frequency-doubled triangular waveform generation is proposed and experimentally demonstrated. The approach is based on an intensity modulator (IM) and a cascaded polarization division multiplexing Mach–Zehnder modulator (PDM-MZM). The IM and the upper arm of the PDM-MZM are driven by the same LO signal, with the former biased at the null point and the latter at the maximum transmission point. By adjusting the modulation index of the upper arm and the direct current (DC) bias of the lower arm of the PDM-MZM, the frequency-doubled full-duty-cycle triangular waveform can be generated. The proposed approach does not use any electrical phase shifter or optical filter, it is easy to implement and exhibits the advantages of good frequency tunability. An experiment is conducted to verify the approach. Triangular waveforms with different repetition rates of 8 GHz and 10 GHz are generated.
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