The University of South Australia (UniSA), established in 1991, is the largest university in South Australia, dedicated to improving economic and societal circumstances through industry-focused education and world-class research. It is recognized as one of the best young universities globally for its excellence, teaching approach, and strong graduate employability. NEC Labs America works with the University of South Australia on advanced video analytics, object tracking, and anomaly detection in complex surveillance systems. Please read about our latest news and collaborative publications with the University of South Australia.

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Multi-parameter distributed fiber sensing with higherorder optical and acoustic modes

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We propose a novel multi-parameter sensing technique based on a Brillouin optical time domain reflectometry in the elliptical-core few-mode fiber, using higher-order optical and acoustic modes. Multiple Brillouin peaks are observed for the backscattering of both the LP01 mode and LP11 mode. We characterize the temperature and strain coefficients for various optical–acoustic mode pairs. By selecting the proper combination of modes pairs, the performance of multi-parameter sensing can be optimized. Distributed sensing of temperature and strain is demonstrated over a 0.5-km elliptical-core few-mode fiber, with the discriminative uncertainty of 0.28°C and 5.81 ?? for temperature and strain, respectively.

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