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Proceedings Paper

Effect of fiber tapering in LPG-based Mach-Zehnder modal interferometers for refractive-index sensing
Author(s): P. Caldas; P. A. S. Jorge; F. Araújo; L. A. Ferreira; G. Rego; J. L. Santos
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Paper Abstract

In this work, an LPG-based Mach-Zehnder modal interferometer with a tapered fiber section between the two LPGs is studied as a sensing structure for measuring environmental refractive index. To interrogate this sensing device, coherence addressing and pseudo-heterodyne processing were used. A fiber taper was made between the two LPGs to improve and tailor the sensitivity of the sensor. Experimental results show that the sensitivity to external refractive index increases with the length of the taper and that the sensitivity enhancement is stronger for lower order cladding modes.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750349 (5 October 2009); doi: 10.1117/12.834951
Show Author Affiliations
P. Caldas, INESC Porto (Portugal)
Univ. do Porto (Portugal)
Escola Superior de Tecnologia e Gestão de Viana do Castelo (Portugal)
P. A. S. Jorge, INESC Porto (Portugal)
F. Araújo, INESC Porto (Portugal)
L. A. Ferreira, INESC Porto (Portugal)
G. Rego, INESC Porto (Portugal)
Escola Superior de Tecnologia e Gestão de Viana do Castelo (Portugal)
J. L. Santos, INESC Porto (Portugal)
Univ. do Porto (Portugal)


Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors

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