Title :
Inline fibre-optic refractometry using index-sensitive resonance positions in single-mode fibre-to-planar-polymer-waveguide couplers
Author :
Johnstone, W. ; Fawcett, G. ; Yim, L.W.K.
Author_Institution :
Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK
fDate :
10/1/1994 12:00:00 AM
Abstract :
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
Keywords :
fibre optic sensors; integrated optics; optical couplers; optical fibre theory; optical fibres; optical waveguides; refractive index measurement; sensitivity; active transducer; closed-loop operation; curing; device fabrication; electro-optic polymers; fibre-to-planar-waveguide coupler; index resolution; index-sensitive resonance positions; index-sensitive resonant wavelength shifts; inline fibre-optic refractometry; polymer; polymer waveguide thickness; refractometer principle; side-polished single-mode optical fibre; single-mode fibre-to-planar-polymer-waveguide couplers; spin deposition;
Journal_Title :
Optoelectronics, IEE Proceedings -
DOI :
10.1049/ip-opt:19941337