High signal-to-noise ratio microwave signal generation based 
on SBS assisted optical heterodyne technology

doi:10.3969/j.issn.1007-5461.2025.05.009

Abstract

Abstract: In this work, the generation of high signal-to-noise ratio (SNR) single-frequency microwave signal without noise sidebands is demonstrated based on the interaction of integrated all-fiber lasers. The microwave signals are generated by the interference between a narrow linewidth Brillouin pump light from a single-frequency laser and the Stokes light generated by it. Firstly, the linewidths of the Stokes lights are compressed to ~ 43 Hz based on the stimulated Brillouin scattering (SBS) effect, which ensures that the frequency noise is as low as possible. And then, the relative intensity noise (RIN) of the firstorder Stokes light is reduced by 21 dB/Hz based on the noise dynamics principle in cascaded SBS effect. By simultaneously reducing the frequency noise and the intensity noise of the coherent signals, the noise sidebands of microwave signals are completely suppressed. As result, the SNR of the microwave signal is improved from 48 dB to 84 dB at the first-order Brillouin frequency shift of 9.415 GHz. Meanwhile, a microwave signal with a SNR of 70 dB is generated at the second-order Brillouin frequency shift of 18.827 GHz. This kind of microwave signals with narrow linewidth and high SNR can provide higher detection resolution and higher transmission efficiency for applications on radar, satellite communication and so on.

Key words: laser techniques, fiber lasers, microwave photonics, optical heterodyne technology, noise suppression

CLC Number:

TN248.1

LUO Qiaoxia, ZHAO Zhongbin, HU Tianhao, ZHOU Yong, ZHENG Ziqi, GAO Weiqing . High signal-to-noise ratio microwave signal generation based on SBS assisted optical heterodyne technology[J]. Chinese Journal of Quantum Electronics, 2025, 42(5): 677-685.

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High signal-to-noise ratio microwave signal generation based on SBS assisted optical heterodyne technology

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