Fibre 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.
|Title of host publication||Photonic Crystal Fibers IV|
|Editors||Kyriacos Kalli, Waclaw Urbanczyk|
|Place of Publication||Bellingham, WA (US)|
|Number of pages||10|
|Publication status||Published - 14 May 2010|
|Event||Photonic Crystal Fibres IV - Brussels - Photonics Europe|
Duration: 14 Apr 2010 → 16 Apr 2010
|Conference||Photonic Crystal Fibres IV|
|City||Brussels - Photonics Europe|
|Period||14/04/10 → 16/04/10|
Bibliographical noteIan 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).
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