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Inline fibre-optic refractometry using index-sensitive resonance positions in single-mode fibre-to-planar-polymer-waveguide couplers

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3 Author(s)
Johnstone, W. ; Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK ; Fawcett, G. ; Yim, L.W.K.

The investigation of a refractometer principle based on index-sensitive resonant wavelength shifts in a fibre-to-planar-waveguide coupler is reported. Device fabrication, involving spin deposition and curing of a polymer onto a side-polished single-mode optical fibre, is relatively straightforward. Three devices of differing polymer waveguide thickness were fabricated and tested, and in all cases there was excellent agreement between experiment and a simple model of operation. The results demonstrated that index resolution down to about 10-5 is realistic. In addition, an active transducer, based on electro-optic polymers for closed-loop operation, was proposed and investigated

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Optoelectronics, IEE Proceedings -  (Volume:141 ,  Issue: 5 )