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<p>In this paper, we have presented a simple scheme to generate multi-frequency dual-chirp microwave waveform with increased time-bandwidth product (TBWP) based on two cascaded polarization modulators. In this scheme, the optical frequency comb (OFC) with four lines, generated by RF signal modulating the lightwave via an optical polarization modulator (PolM), is modulated by a parabolic signal via a second PolM to introduce the parabolic phase difference between the tones. After heterodyne beating in balanced photodetector, the parabolic phase-shifted OFC is converted to three-band dual-chirp microwave waveform. In order to increase the TBWP, the parabolic signal is divided into multi-segments and phase encoded to multiply both the bandwidth and temporal duration of the generated dual-chirp microwave waveform, respectively. The simulation results show that dual-chirp microwave waveforms with frequency-bandwidth of 10–3.2&#xa0;GHz, 20–3.2&#xa0;GHz, and 30–3.2&#xa0;GHz, covering X, K, and Ka bands, are generated simultaneously. The generated waveform has the TBWP of 5133 approximately. Their auto-correlation results manifest high peak-to-sidelobe ratio and good pulse compression capabilities. These agree well with our theoretical prediction. The generated multi-frequency dual-chirp microwave waveforms with high-frequency, large bandwidth, and large TBWP, are expected to be used in multi-band radar system to improve its range resolution and detection range.</p>

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Photonic approach to multi-band dual-chirp microwave waveform generation with improved time-bandwidth product

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Hongshi Zhao,
  • Jialing Yang,
  • Zengping Zhang

摘要

In this paper, we have presented a simple scheme to generate multi-frequency dual-chirp microwave waveform with increased time-bandwidth product (TBWP) based on two cascaded polarization modulators. In this scheme, the optical frequency comb (OFC) with four lines, generated by RF signal modulating the lightwave via an optical polarization modulator (PolM), is modulated by a parabolic signal via a second PolM to introduce the parabolic phase difference between the tones. After heterodyne beating in balanced photodetector, the parabolic phase-shifted OFC is converted to three-band dual-chirp microwave waveform. In order to increase the TBWP, the parabolic signal is divided into multi-segments and phase encoded to multiply both the bandwidth and temporal duration of the generated dual-chirp microwave waveform, respectively. The simulation results show that dual-chirp microwave waveforms with frequency-bandwidth of 10–3.2 GHz, 20–3.2 GHz, and 30–3.2 GHz, covering X, K, and Ka bands, are generated simultaneously. The generated waveform has the TBWP of 5133 approximately. Their auto-correlation results manifest high peak-to-sidelobe ratio and good pulse compression capabilities. These agree well with our theoretical prediction. The generated multi-frequency dual-chirp microwave waveforms with high-frequency, large bandwidth, and large TBWP, are expected to be used in multi-band radar system to improve its range resolution and detection range.