Photonic-assisted generation of chirp microwave waveforms with switchable bands and immunity of dispersion-induced power fading

Xiao Liu; Yunxin Wang; Jing Zhang; Yu Zhang

doi:10.1117/12.3023563

18 March 2024 Photonic-assisted generation of chirp microwave waveforms with switchable bands and immunity of dispersion-induced power fading

Xiao Liu, Yunxin Wang, Jing Zhang, Yu Zhang

Author Affiliations +

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 1310447 (2024) https://doi.org/10.1117/12.3023563
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

Linearly frequency modulated (LFM) microwave signals have received extensive attention due to their powerful target detection capability. A photonic-assisted chirp microwave waveform generation scheme with switchable bands is proposed based on a dual-polarization dual-parallel Mach-Zehnder modulator (DP-DPMZM). A radio frequency (RF) signal and a baseband linearly frequency modulated (LFM) signal are applied on DPMZM_X and DPMZM_Y, respectively. For the generation of LFM signal at one band, both DPMZM_X and DPMZM_Y are biased to achieve carrier suppressed single sideband modulation (CS-SSB). When changing the phase shift between the two RF signals and the bias voltages applied on the DPMZM_X, the +2^nd-order sideband and optical carrier are obtained at X polarization state. Meanwhile, DPMZM_Y is biased to achieve single sideband (SSB) modulation at Y polarization state. Owing to the polarization property of optical signal, the optical carrier can be cancelled, thus a LFM signal at another band can be generated. An experiment is conducted to validate the proposed scheme. Experimental results show that down-chirped LFM signals at X-band and K-band are obtained. Since the SSB modulation is adopted for the system, the dispersion-induced power fading can be eliminated. The proposed scheme has wide applications in multi-target and long-distance detection in radar systems.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xiao Liu, Yunxin Wang, Jing Zhang, and Yu Zhang "Photonic-assisted generation of chirp microwave waveforms with switchable bands and immunity of dispersion-induced power fading", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 1310447 (18 March 2024); https://doi.org/10.1117/12.3023563

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KEYWORDS

Signal generators

Polarization

Modulation

Phase shifts

Single sideband modulation

X band

Modulation frequency

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