Distributed multi-parameter sensor based on Brillouin scattering in an etched few-mode multi-core fiber

Sheng, Donghe; Han, Zhe; Qiao, Zanyang; Dong, Tianpei; Wang, Chenxi; Tian, Huiping

doi:10.1016/j.optcom.2023.130085

Cited by 2 publications

(1 citation statement)

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“…Few-mode fibers (FMFs) are used in distributed temperature measurements as a new type of optical fiber that is different from ordinary single-mode fibers. Because FMFs have large core diameters, high SBS thresholds, and transmits a limited number of orthogonal modes [13,14], it can achieve the sensing of parameters such as temperature, strain, and bending, and can overcoming the problem of multiparameter cross-sensitivity, with potential for simultaneous multiparameter measurements [15][16][17][18], which has received widespread attention from researchers [19][20][21]. When light waves are coupled in FMFs, different Brillouin scattering spectra (BGSs) will be formed for the optical signals in the different modes, which react differently to changes in the measurement parameters.…”

Section: Introductionmentioning

confidence: 99%

Performance Enhancement in a Few-Mode Rayleigh-Brillouin Optical Time Domain Analysis System Using Pulse Coding and LMD Algorithm

Zhang,

Li,

Wang

et al. 2024

Photonics

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Rayleigh Brillouin optical time domain analysis (BOTDA) uses the backscattered Rayleigh light generated in the fiber as the probe light, which has a lower detection light intensity compared to the BOTDA technique. As a result, its temperature-sensing technology suffers from a low signal-to-noise ratio (SNR) and severe sensing unreliability due to the influence of the low probe signal and high noise level. The pulse coding and LMD denoising method are applied to enhance the performance of the Brillouin frequency shift detection and temperature measurement. In this study, the mechanism of Rayleigh BOTDA based on a few-mode fiber (FMF) is investigated, the principles of the Golay code and local mean decomposition (LMD) algorithm are analyzed, and the experimental setup of the Rayleigh BOTDA system using an FMF is constructed to analyze the performance of the sensing system. Compared with a single pulse of 50 ns, the 32-bit Golay coding with a pulse width of 10 ns improves the spatial resolution to 1 m. Further enhanced by the LMD algorithm, the SNR and temperature measurement accuracy are increased by 5.5 dB and 1.05 °C, respectively. Finally, a spatial resolution of 1.12 m and a temperature measurement accuracy of 2.85 °C are achieved using a two-mode fiber with a length of 1 km.

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