Dependence of Brillouin frequency shift on water absorption ratio in polymer optical fibers

Kazunari Minakawa, Kotaro Koike, Neisei Hayashi, Yasuhiro Koike, Yosuke Mizuno, Kentaro Nakamura

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3 Citations (Scopus)


We studied the dependence of the Brillouin frequency shift (BFS) on the water-absorption ratio in poly(methyl methacrylate)-based polymer optical fibers (POFs) to clarify the effect of the humidity on POF-based Brillouin sensors. The BFS, deduced indirectly using an ultrasonic pulse-echo technique, decreased monotonically as the water absorption ratio increased, mainly because of the decrease in the Young's modulus. For the same water absorption ratio, the BFS change was larger at a higher temperature. The maximal BFS changes (absolute values) at 40, 60, and 80 °C were 158, 285, and 510 MHz, respectively (corresponding to the temperature changes of ∼9 °C, ∼16 °C, and ∼30 °C). Thus, some countermeasure against the humidity is indispensable in implementing strain/temperature sensors based on Brillouin scattering in POFs, especially at a higher temperature. On the other hand, Brillouin-based distributed humidity sensors might be developed by exploiting the BFS dependence on water absorption in POFs.

Original languageEnglish
Article number223102
JournalJournal of Applied Physics
Issue number22
Publication statusPublished - 2016 Jun 14

ASJC Scopus subject areas

  • General Physics and Astronomy


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