Multimodal interference based on large-core air-clad photonic crystal fibres for simultaneous measurement of multiparameters

Susana Silva; J. L. Santos; F. X. Malcata; Jens Kobelke; Kay Schuster; O. Frazão

doi:10.1117/12.885999

17 May 2011 Multimodal interference based on large-core air-clad photonic crystal fibres for simultaneous measurement of multiparameters

Susana Silva, J. L. Santos, F. X. Malcata, Jens Kobelke, Kay Schuster, O. Frazão

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Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77534A (2011) https://doi.org/10.1117/12.885999
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

This work describes a large-core air-clad photonic crystal fibre-based sensing structure that is sensitive to refractive index, temperature and strain. The sensing head is based on multimodal interference, and relies on a single mode - largecore air-clad photonic crystal fibre - single mode fibre configuration. Using two distinct large-core air-clad PCF geometries it is possible to obtain an optical spectrum with two dominant loss bands, at wavelengths that have different sensitivities to physical parameters. This characteristic is explored to demonstrate a sensing head that permits the straintemperature discrimination functionality. It is also shown the large-core air-clad photonic crystal fibre can be applied to implement a sensing head sensitive to the water refractive index changes induced by temperature variations.

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Susana Silva, J. L. Santos, F. X. Malcata, Jens Kobelke, Kay Schuster, and O. Frazão "Multimodal interference based on large-core air-clad photonic crystal fibres for simultaneous measurement of multiparameters", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77534A (17 May 2011); https://doi.org/10.1117/12.885999

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KEYWORDS

Refractive index

Head

Structural sensing

Water

Photonic crystal fibers

Single mode fibers

Temperature metrology

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