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Volume 11
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10.3390/photonics11040357
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Article

Microwave Photonics Broadband Doppler Velocity Simulator with High Spurious Suppression Ratio by Using Serrodyne Modulation

by
Zhe Liu
1,2,
Dayong Wang
1,2,
Weimin Zhu
3,
Jing Zhang
1,2,
Yunxin Wang
1,2,*,
Jinchuan Yao
1,2 and
Yu Zhang
1,2
1
School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
2
Beijing Engineering Research Center of Precision Measurement Technology and Instruments, Beijing University of Technology, Beijing 100124, China
3
Henan Institute of Metrology, Zhengzhou 450000, China
*
Author to whom correspondence should be addressed.
Photonics 2024, 11(4), 357; https://doi.org/10.3390/photonics11040357
Submission received: 7 March 2024 / Revised: 4 April 2024 / Accepted: 7 April 2024 / Published: 12 April 2024
(This article belongs to the Section Optoelectronics and Optical Materials)
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Abstract

A Doppler velocity simulation method based on serrodyne modulation is proposed to achieve the frequency shift from hundred hertz to megahertz. One sub-phase modulation (PM) in a dual-parallel dual-drive Mach–Zehnder modulator loads a sawtooth signal to achieve a small frequency shift of the optical carrier. The other three sub-PMs implement carrier-suppressed double-band modulation of the RF signal. The RF signal is directly coupled from the receiving antenna to the modulator’s RF port without any electrical devices like a 90° hybrid, which ensures a broad operational bandwidth of the system. After filtering out one of the RF modulation sidebands by an optical filter, Doppler frequency shifting (DFS) is realized through frequency beating. The half-wave voltage of modulators rapidly decreases at low frequency shifts, leading to an increase in spurious signals. In order to improve the spurious suppression ratio (SSR) of DFS, a digital pre-distortion compensation based on the measured half-wave voltage is implemented in the frequency domain. Experimental results show that SSRs are larger than 35 dB when frequency shifts range from 0.1 kHz to 1 MHz. The RF operation bandwidth covers 2–40 GHz. The effectiveness of a Doppler velocity simulator is evaluated, and the simulation velocity error is less than 0.06 km/h. The proposed method has potential applications in both broadband electronic warfare and traffic metering applications.
Keywords: Doppler velocity simulation; microwave photonic frequency shift; serrodyne modulation Doppler velocity simulation; microwave photonic frequency shift; serrodyne modulation

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MDPI and ACS Style

Liu, Z.; Wang, D.; Zhu, W.; Zhang, J.; Wang, Y.; Yao, J.; Zhang, Y. Microwave Photonics Broadband Doppler Velocity Simulator with High Spurious Suppression Ratio by Using Serrodyne Modulation. Photonics 2024, 11, 357. https://doi.org/10.3390/photonics11040357

AMA Style

Liu Z, Wang D, Zhu W, Zhang J, Wang Y, Yao J, Zhang Y. Microwave Photonics Broadband Doppler Velocity Simulator with High Spurious Suppression Ratio by Using Serrodyne Modulation. Photonics. 2024; 11(4):357. https://doi.org/10.3390/photonics11040357

Chicago/Turabian Style

Liu, Zhe, Dayong Wang, Weimin Zhu, Jing Zhang, Yunxin Wang, Jinchuan Yao, and Yu Zhang. 2024. "Microwave Photonics Broadband Doppler Velocity Simulator with High Spurious Suppression Ratio by Using Serrodyne Modulation" Photonics 11, no. 4: 357. https://doi.org/10.3390/photonics11040357

APA Style

Liu, Z., Wang, D., Zhu, W., Zhang, J., Wang, Y., Yao, J., & Zhang, Y. (2024). Microwave Photonics Broadband Doppler Velocity Simulator with High Spurious Suppression Ratio by Using Serrodyne Modulation. Photonics, 11(4), 357. https://doi.org/10.3390/photonics11040357

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