Abstract
This paper has proposed a photonic microwave waveforms generation scheme based on a dual-polarization Mach–Zehnder modulator (DPol-MZM) at moderate modulation depth without optical filtering. In the scheme, two sub-MZMs are driven by a fundamental frequency and a frequency tripled signal, respectively, to perform the optical carrier suppression modulation along two orthogonal polarization directions. Due to the polarization orthogonality of the tones, there is no cross-beating term in the photocurrent after photodetection. The harmonics power ratio is adjusted by varying the modulation indices and DC biases to obtain the temporal triangular and square waveforms. Frequency-doubled triangular and square waveforms with full duty cycle at repetition rates of 5, 10 and 20 GHz are successfully generated with optimized modulation indices and demonstrated by the simulation.
Published Version
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