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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 20 — Sep. 26, 2011
  • pp: 18842–18860

Opto-acoustic behavior of coated fiber Bragg gratings

Massimo Moccia, Marco Pisco, Antonello Cutolo, Vincenzo Galdi, Pierantonio Bevilacqua, and Andrea Cusano  »View Author Affiliations

Optics Express, Vol. 19, Issue 20, pp. 18842-18860 (2011)

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In this paper, we present the study of the acousto-optic behavior of underwater-acoustic sensors constituted by fiber Bragg gratings (FBGs) coated by ring-shaped overlays. Via full-wave numerical simulations, we study the complex opto-acousto-mechanical interaction among an incident acoustic wave traveling in water, the optical fiber surrounded by the ring shaped coating, and the FBG inscribed the fiber, focusing on the frequency range 0.5-30 kHz of interest for SONAR applications. Our results fully characterize the mechanical behavior of an acoustically driven coated FBG, and highlight the key role played by the coating in enhancing significantly its sensitivity by comparison with a standard uncoated configuration. Furthermore, the hydrophone sensitivity spectrum exhibits characteristic resonances, which strongly improve the sensitivity with respect to its background (i.e., away from resonances) level. Via a three-dimensional modal analysis, we verify that the composite cylindrical structure of the sensor acts as an acoustic resonator tuned at the frequencies of its longitudinal vibration modes. In order to evaluate the sensor performance, we also carry out a comprehensive parametric analysis by varying the geometrical and mechanical properties of the coating, whose results also provide a useful design tool for performance optimization and/or tailoring for specific SONAR applications. Finally, a preliminary validation of the proposed numerical analysis has been carried out through experimental data obtained using polymeric coated FBGs sensors revealing a good agreement and prediction capability.

© 2011 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.1040) Optical devices : Acousto-optical devices
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:

Original Manuscript: June 30, 2011
Revised Manuscript: August 18, 2011
Manuscript Accepted: August 22, 2011
Published: September 13, 2011

Massimo Moccia, Marco Pisco, Antonello Cutolo, Vincenzo Galdi, Pierantonio Bevilacqua, and Andrea Cusano, "Opto-acoustic behavior of coated fiber Bragg gratings," Opt. Express 19, 18842-18860 (2011)

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