Dr. Yu Zhang Profile

Dr. Yu Zhang

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Proceedings Article | 18 March 2024 Paper

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

Proceedings Volume 13104, 1310447 (2024) https://doi.org/10.1117/12.3023563

KEYWORDS: Signal generators, Polarization, Single sideband modulation, Phase shifts, Modulation, X band, Modulation frequency

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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.

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