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Proceedings Article

Multiplexed FBG sensor recorded in multimode microstructured polymer optical fibre

[+] Author Affiliations
Ian P. Johnson, David J. Webb

Aston Univ. (United Kingdom)

Kyriacos Kalli

Cyprus Univ. of Technology (Cyprus)

Maryanne C. J. Large, Alexander Argyros

The Univ. of Sydney (Australia)

Proc. SPIE 7714, Photonic Crystal Fibers IV, 77140D (May 14, 2010); doi:10.1117/12.854410
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From Conference Volume 7714

  • Photonic Crystal Fibers IV
  • Kyriacos Kalli; Waclaw Urbanczyk
  • Brussels, Belgium | April 12, 2010

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.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Ian P. Johnson ; David J. Webb ; Kyriacos Kalli ; Maryanne C. J. Large and Alexander Argyros
"Multiplexed FBG sensor recorded in multimode microstructured polymer optical fibre", Proc. SPIE 7714, Photonic Crystal Fibers IV, 77140D (May 14, 2010); doi:10.1117/12.854410; http://dx.doi.org/10.1117/12.854410


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