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Filter-free photonic microwave waveforms generation based on polarization-sensitive Mach–Zehnder modulator


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.

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This work was supported in part by the National Natural Science Foundation of China (NSFC, Grant: 61690195) and the Fund of State Key Laboratory of IPOC (IPOC2018ZT09).

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Correspondence to Jianxin Ma.

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Zhao, H., Ma, J. Filter-free photonic microwave waveforms generation based on polarization-sensitive Mach–Zehnder modulator. Photon Netw Commun 41, 222–230 (2021).

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  • Microwave photonics
  • Triangular waveform generation
  • Square waveform generation
  • Dual-polarization Mach–Zehnder modulator