Fibre Bragg gratings have been UV inscribed in multimode microstructured polymer optical fibre in both the 1550nm and 800nm spectral regions. Thermally annealing the fibre at 80°C has been shown to shrink the fibre length and as a result a permanent negative Bragg wavelength shift is observed. The blue shift can be tuned between 0-16nm in the 1550nm spectral region and 0-6nm in the 800nm spectral region, depending on the duration the heat is applied before a saturation level is reached and the fibre stops shrinking in the region of 2 hours. Exploiting this, wavelength division multiplexed sensors have been UV inscribed in both the 1550nm and 800nm regions using a single phase mask for each wavelength region. The 800nm sensor takes advantage of the lower attenuation of poly (methyl methacrylate) of 2dB/m compared to 100dB/m at 1550nm.
|Conference||21st International Conference on Optical Fiber Sensors|
|Period||15/05/11 → 19/05/11|
Johnson, I.P.; Webb, David J. and Kalli, Kyriacos, Utilisation of thermal annealing to record multiplexed FBG sensors in multimode microstructured polymer optical fibre. IN: 21st International Conference on Optical Fiber Sensors (OFS21). Ottawa (CA), 15-19 May 2011. Wojtek J. Bock; Jacques Albert; Xiaoyi Bao (eds.), 327, (2011). Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
- Fibre Bragg gratings
- UV inscribed
- multimode microstructured polymer optical fibre
- thermally annealing
- fibre length
- permanent negative Bragg wavelength shift
- wavelength division multiplexed sensors
- single phase mask
- wavelength region
- lower attenuation
- poly (methyl methacrylate)