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Proceedings Paper

Multiplexed FBG sensor recorded in multimode microstructured polymer optical fibre
Author(s): Ian P. Johnson; David J. Webb; Kyriacos Kalli; Maryanne C. J. Large; Alexander Argyros
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Paper Abstract

bre Bragg gratings have been inscribed in multimode microstructured polymer optical fibre (POF), with a core size of 50μm. The microstructured POF (mPOF) consists of a three ring hole structure and is made purely from poly(methyl methacrylate) (PMMA). In comparison to silica fibre, POF has a much smaller Young's modulus and a much greater breaking strain; additionally multimode fibre holds advantages of ease of handling and launching conditions. A linear strain sensitivity of 1.32 ± 0.01pm/με has been measured in the range 0 to 2% strain. The fibre drawing process leads to a degree of molecular alignment along the fibre axis. This alignment can be thermally annealed out; this can induce a permanent blue shift in the Bragg wavelength of a grating fabricated prior to annealing by up to 20 nm. Utilising this, wavelength demultiplexed gratings can be fabricated using a single phase mask. As an illustration of this we present for the first time wavelength division multiplexing of the spectral response of three Bragg gratings in POF within the C-band region. Complementing this work, a technique of splicing mPOF to step index silica fibre is described using UV curing optical adhesive, allowing characterisation of Bragg gratings fabricated in this fibre.

Paper Details

Date Published: 14 May 2010
PDF: 10 pages
Proc. SPIE 7714, Photonic Crystal Fibers IV, 77140D (14 May 2010); doi: 10.1117/12.854410
Show Author Affiliations
Ian P. Johnson, Aston Univ. (United Kingdom)
David J. Webb, Aston Univ. (United Kingdom)
Kyriacos Kalli, Cyprus Univ. of Technology (Cyprus)
Maryanne C. J. Large, The Univ. of Sydney (Australia)
Alexander Argyros, The Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 7714:
Photonic Crystal Fibers IV
Kyriacos Kalli; Waclaw Urbanczyk, Editor(s)

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