Few-mode fiber multi-parameter sensor with distributed temperature and strain discrimination

Abstract

We propose a unique few-mode fiber (FMF)-based multi-parameter optical-fiber sensor for distributed measurement of temperature and strain. We launch a pump and a probe signal through specific linearly polarized modes into a FMF, and monitor the Brillouin frequency shift (BFS) in each mode. By analyzing the temperature and strain coefficients of the BFS of the two lowest order (${\mathrm{LP}}_{01}$, ${\mathrm{LP}}_{11}$) modes, discrimination of temperature and strain are successfully demonstrated, with an accuracy of 1.2°C and $21.9\mathrm{\mu \epsilon }$.

© 2015 Optical Society of America

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