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.

本文提出了一种基于双极化马赫曾德尔调制器（DPol-MZM）的光子微波波形生成方案，该调制器在不进行光学滤波的情况下具有中等调制深度。在该方案中，两个子MZM分别由基频和三倍频信号驱动，以沿两个正交偏振方向执行光载波抑制调制。由于音调的极化正交性，光电检测后的光电流中没有交叉跳动项。通过改变调制指数和直流偏置来调整谐波功率比，以获得时间三角波和方波。重复频率为5时具有完整占空比的倍频三角波和方波