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Proceedings Paper

Fiber Bragg gratings in microstructured optical fibers for stress monitoring
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Paper Abstract

Combining the functionalities of fiber Bragg gratings (FBGs) and microstructured optical fibers (MOFs) offers promising technological perspectives in the field of optical fiber sensors. Indeed, MOFs could overcome some of the limitations of FBGs in conventional fibers for sensor applications. The added value of MOFs stems from the ability to design an optical fiber in which an FBG acts as a sensor with a selective sensitivity, e.g. a sensor that is sensitive to directional strain but not to temperature. For this purpose we use a MOF with a phase modal birefringence on the order of 8×10-3. A FBG in this MOF yields two Bragg peak wavelengths, with a wavelength separation that depends on the phase modal birefringence of the MOF. We characterize these FBGs for transversal loads on a bare fiber and compare the results with simulated sensitivities. Then, we embed the sensor in a composite coupon and measure the response of the Bragg peak wavelengths as a function of the applied transversal pressure on the composite material. This allows drawing conclusions on the advantages of FBGs in MOFs for sensing applications.

Paper Details

Date Published: 19 May 2009
PDF: 8 pages
Proc. SPIE 7357, Photonic Crystal Fibers III, 73570I (19 May 2009); doi: 10.1117/12.820441
Show Author Affiliations
Thomas Geernaert, Vrije Univ. Brussel (Belgium)
Geert Luyckx, Univ. Gent (Belgium)
Eli Voet, Univ. Gent (Belgium)
Tomasz Nasilowski, Vrije Univ. Brussel (Belgium)
Karima Chah, Vrije Univ. Brussel (Belgium)
Martin Becker, IPHT Jena (Germany)
Hartmut Bartelt, IPHT Jena (Germany)
Waclaw Urbanczyk, Wroclaw Univ. of Technology (Poland)
Jan Wójcik, Maria Curie-Sklodowska Univ. (Poland)
Wim De Waele, Univ. Gent (Belgium)
Joris Degrieck, Univ. Gent (Belgium)
Francis Berghmans, Vrije Univ. Brussel (Belgium)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)

Published in SPIE Proceedings Vol. 7357:
Photonic Crystal Fibers III
Kyriacos Kalli, Editor(s)

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