Accurate Estimation of Brillouin Frequency Shift in Brillouin Optical Correlation Domain Analysis

Kalepu, Yaswanth; Somepalli, Bhargav; Khankhoje, Uday K.; Venkitesh, Deepa; Srinivasan, Balaji

doi:10.1109/jlt.2019.2941499

Cited by 4 publications

References 17 publications

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Brillouin optical correlation domain analysis based on a phase-chaos laser

Niu,

Wang,

Chen

et al. 2024

Adv. Photon. Nexus

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The physical mechanism of gain motivation is the main theoretical bottleneck that restricts the signalto-noise ratio (SNR) and results in a mono-merit implementation for the existing stimulated Brillouin scatteringbased fiber sensors. A phase-chaos laser (PCL) is proposed and introduced in the Brillouin optical correlation domain analysis (BOCDA) scheme to promote the SNR and achieve a high-accuracy measurement. The PCL characteristics are presented, and a theoretical model of chaos gain accumulation and extraction is perfected. Then, the simulation results reveal that the SNR is improved by 5.56 dB, and the signal-to-background noise ratio (SBR) of the Brillouin gain spectrum (BGS) is promoted by 8.28 dB with a 100-km sensing distance. Further, the PCL is experimentally generated. In the proof-of-concept experiment, the accuracy of the Brillouin frequency shift is upgraded to AE0.64 MHz, and the SBR of BGS is improved by 10.77 dB. The PCL provides a new research direction for optical chaos, and the PCL-BOCDA showcases a promising future for optimal-merit-coupling sensing and its application.

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