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Proceedings Paper

Investigations on birefringence effects in polymer optical fiber Bragg gratings
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Paper Abstract

Step-index polymer optical fiber Bragg gratings (POFBGs) and microstructured polymer optical fiber Bragg gratings (mPOFBGs) present several attractive features, especially for sensing purposes. In comparison to FBGs written in silica fibers, they are more sensitive to temperature and pressure because of the larger thermo-optic coefficient and smaller Young’s modulus of polymer materials. (M)POFBGs are most often photowritten in poly(methylmethacrylate) (PMMA) materials using a continuous-wave 325 nm HeCd laser. For the first time to the best of our knowledge, we study photoinduced birefringence effects in (m)POFBGs. To achieve this, highly reflective gratings were inscribed with the phase mask technique. They were then monitored in transmission with polarized light. For this, (m)POF sections a few cm in length containing the gratings were glued to angled silica fibers. Polarization dependent loss (PDL) and differential group delay (DGD) were computed from the Jones matrix eigenanalysis using an optical vector analyser. Maximum values exceeding several dB and a few picoseconds were obtained for the PDL and DGD, respectively. The response to lateral force was finally investigated. As it induces birefringence in addition to the photo-induced one, an increase of the PDL and DGD values were noticed.

Paper Details

Date Published: 2 May 2014
PDF: 6 pages
Proc. SPIE 9128, Micro-structured and Specialty Optical Fibres III, 91280Q (2 May 2014); doi: 10.1117/12.2054025
Show Author Affiliations
X. Hu, Univ. de Mons (Belgium)
D. Sáez-Rodríguez, Aston Univ. (United Kingdom)
O. Bang, Technical Univ. of Denmark (Denmark)
D. J. Webb, Aston Univ. (United Kingdom)
C. Caucheteur, Univ. de Mons (Belgium)


Published in SPIE Proceedings Vol. 9128:
Micro-structured and Specialty Optical Fibres III
Kyriacos Kalli; Alexis Mendez, Editor(s)

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