Multiplexed FBG sensor recorded in multimode microstructured polymer optical fibre

Ian P. Johnson, David J. Webb, Kyriacos Kalli, Maryanne C.J. Large, Alexander Argyros

Research output: Chapter in Book/Published conference outputConference publication


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.
Original languageEnglish
Title of host publicationPhotonic Crystal Fibers IV
EditorsKyriacos Kalli, Waclaw Urbanczyk
Place of PublicationBellingham, WA (US)
Number of pages10
ISBN (Print)978-0-819-48187-0
Publication statusPublished - 14 May 2010
EventPhotonic Crystal Fibres IV - Brussels - Photonics Europe
Duration: 14 Apr 201016 Apr 2010

Publication series

NameSPIE Proceedings
ISSN (Print)0277-786X
ISSN (Electronic)2410-9045


ConferencePhotonic Crystal Fibres IV
CityBrussels - Photonics Europe

Bibliographical note

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).

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