Abstract
We report for the first time a unique multi-parameter optical fiber sensor based on the stimulated scattering of higher order acoustic modes of Orbital Angular Momentum (OAM) guiding fiber. Both optical modes and acoustic modes guided within the core region of OAM fiber are characterized and demonstrated theoretically and experimentally. Simulation analysis shows that the multi-peak feature in the Brillouin gain spectrum (BGS) of OAM fiber is attributed to the couplings among the guided optical modes and higher-order acoustic modes. The frequency shifts of first two Brillouin peaks are successfully monitored to discriminate the temperature and strain with an accuracy of 0.21oC and 4.6μe.
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