Abstract

Chalcogenide fibers are currently being used widely in nonlinear optical signal processing, as they exhibit ultrahigh nonlinearity. Here, we propose a sensor based on stimulated Brillouin scattering for simultaneous temperature and strain measurement in a dual-core tapered ${{\rm As}_2}{{\rm Se}_3}$-polymethyl methacrylate fiber using a Brillouin optical time-domain analysis system. Different Brillouin frequency responses under temperature and strain variations and the separation of Brillouin frequency shifts (BFSs) in two principal polarization axes are demonstrated experimentally over a 50-cm-long tapered dual-core hybrid microfiber. The temperature coefficients are ${-}{3.8272}\;{\rm MHz/}^\circ {\rm C}$ and ${-}{3.3302}\;{\rm MHz/}^\circ {\rm C}$, and the strain coefficients are ${-}0.06143 \;{\rm MHz}/{\unicode{x00B5}\unicode{x03B5}}$ and ${-}0.03463 \;{\rm MHz}/{\unicode{x00B5}\unicode{x03B5}}$. Due to the different temperature and strain dependences of Brillouin frequency peaks in two polarizations, temperature and strain resolutions of 1°C and $33\;{\unicode{x00B5}\unicode{x03B5}}$ are realized, respectively. Numerical simulations are also reported to account for the BFS difference in two polarization axes.

© 2020 Optical Society of America

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