Effect of fiber tapering in LPG-based Mach-Zehnder modal interferometers for refractive-index sensing

P. Caldas; P. A. S. Jorge; F. Araújo; L. A. Ferreira; G. Rego; J. L. Santos

doi:10.1117/12.834951

5 October 2009 Effect of fiber tapering in LPG-based Mach-Zehnder modal interferometers for refractive-index sensing

P. Caldas, P. A. S. Jorge, F. Araújo, L. A. Ferreira, G. Rego, J. L. Santos

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 750349 (2009) https://doi.org/10.1117/12.834951
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

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.

Citation Download Citation

P. Caldas, P. A. S. Jorge, F. Araújo, L. A. Ferreira, G. Rego, and J. L. Santos "Effect of fiber tapering in LPG-based Mach-Zehnder modal interferometers for refractive-index sensing", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 750349 (5 October 2009); https://doi.org/10.1117/12.834951

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