Broadband microwave signal reception based on optical down-conversion and coherent demodulation

Lijun Luo; Weiqiang Lyu; Bao Sun; Zhiyao Zhang; Yong Liu

doi:10.1117/12.3007702

24 November 2023 Broadband microwave signal reception based on optical down-conversion and coherent demodulation

Lijun Luo, Weiqiang Lyu, Bao Sun, Zhiyao Zhang, Yong Liu

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129352Y (2023) https://doi.org/10.1117/12.3007702
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

Microwave photonics offers a promising solution to the increasing demand for high-frequency and broadband signals in battlefield communications. We propose a method for receiving broadband microwave signals with image-reject processing. The approach involves two main processes: signal reception and image-reject processing. In signal reception, the input broadband signal with a frequency span from DC to 40 GHz is multicast to three-tone signal optical carriers using a Mach-Zehnder modulator (MZM) biased at its minimum transmission bias point (MITB). Then, by using a three-tone local oscillator (LO) optical carriers to align with the corresponding modulation sidebands of the signal optical carriers, the input signal at any center frequency and with a bandwidth of 10 GHz can be demodulated after one capture. Hence, the full bandwidth of 40 GHz can be received by capturing the signal four times. In image-reject processing, the modulation sidebands of the signal carriers and the corresponding LO carriers are injected into an optical coherent receiver to achieve IQ demodulation. The generated in-phase (I) and quadrature (Q) signals are digitized and processed to suppress image interference. A numerical simulation is carried out to validate the proposed scheme. The simulation result indicates that the proposed scheme is capable of receiving broadband signals with a bandwidth of 40 GHz and its instantaneous bandwidth is equal to 10 GHz. Besides, the sensitivity and the dynamic range of the proposed system are equal to -85 dBm and 109.9 dB·Hz2/3, respectively. The proposed scheme is promising for enhancing the receive bandwidth and the sensitivity in electromagnetic spectrum sensing applications.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lijun Luo, Weiqiang Lyu, Bao Sun, Zhiyao Zhang, and Yong Liu "Broadband microwave signal reception based on optical down-conversion and coherent demodulation", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129352Y (24 November 2023); https://doi.org/10.1117/12.3007702

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KEYWORDS

Microwave radiation

Image processing

Signal processing

Demodulation

Modulation

Optical coherence

Microwave photonics

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