Abstract
Discriminative measurement of strain and temperature distribution is experimentally demonstrated by optical time-domain reflectometry of Brillouin dynamic grating (BDG-OTDR) in an elliptical core two-mode fiber (e-core TMF). The acoustic waves generated by the amplified spontaneous Brillouin scattering of LP 01 mode in x-polarization are used to reflect the LP 11 mode in x- and y-polarizations. Distribution maps of intermodal birefringence between the LP01 and LP11 modes with two different polarizations are measured to separate strain and temperature induced spectral shift of the BDG in a 95 m e-core TMF with 2.0 m spatial resolution. The strain and temperature sensitivities are measured to be −0.082 MHz/μe and 6.8 MHz/°C for the pair of LP 01 x-LP 11 x modes, and −0.095 MHz/μe and 3.9 MHz/°C for the pair of LP 01 x-LP 11 x modes, respectively.
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