OTDR based on Brillouin dynamic grating in an e-core two-mode fiber for simultaneous measurement of strain and temperature distribution

Yong Hyun Kim; Kwang Yong Song

doi:10.1117/12.2267466

23 April 2017 OTDR based on Brillouin dynamic grating in an e-core two-mode fiber for simultaneous measurement of strain and temperature distribution

Yong Hyun Kim, Kwang Yong Song

Author Affiliations +

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103230S (2017) https://doi.org/10.1117/12.2267466
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

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 LP₀₁ mode in x-polarization are used to reflect the LP₁₁ 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 ecore TMF with 2.0 m spatial resolution. The strain and temperature sensitivities are measured to be ‒0.082 MHz/με and 6.8 MHz/°C for the pair of LP₀₁ ^y-LP₁₁ ^x modes, and ‒0.095 MHz/με and 3.9 MHz/°C for the pair of LP₀₁^x-LP₁₁ ^xmodes, respectively.

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Yong Hyun Kim and Kwang Yong Song "OTDR based on Brillouin dynamic grating in an e-core two-mode fiber for simultaneous measurement of strain and temperature distribution", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103230S (23 April 2017); https://doi.org/10.1117/12.2267466

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