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Underwater acoustic sensing by using cascaded-chirped long period fiber gratings

Hayato Takeyama, Satoshi Tanaka, Atsushi Wada, and Nobuaki Takahashi

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Abstract

Cascaded chirped long period fiber gratings (C-CLPG) are provided as sensing elements for use in intensity-based underwater acoustic fiber-optic sensors, in which C-CLPGs are inscribed in photosensitive fiber by means of point-by-point technique with UV radiation. For a demonstration, C-CLPGs are immersed in a water vessel and exerted by underwater acoustic waves. In the demonstration, higher sensitive underwater acoustic detection is obtained by employing a C-CLPG with the steeper channeled spectrum.

© 2018 The Author(s)

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