Modal LPG-based Mach-Zehnder interferometer with controlled sensitivity for refractive index measurement

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

doi:10.1117/12.786093

16 May 2008 Modal LPG-based Mach-Zehnder interferometer with controlled sensitivity for refractive index measurement

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

Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 700448 (2008) https://doi.org/10.1117/12.786093
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

In this work, an LPG-based Mach-Zehnder interferometer was evaluated as a sensing structure for environmental refractive index measurement. To interrogate this sensing device, coherence addressing and pseudo-heterodyne processing were used. The impact of stretching, bending and twisting the interferometer on the sensitivity to refractive index changes r was studied. It is shown that, due to the antisymmetric nature of cladding modes in arc-induced LPGs, it is possible to tune the system sensitivity by simple mechanical action.

Citation Download Citation

P. Caldas, P. A. S. Jorge, F. Araújo, L. A. Ferreira, G. Rego, and J. L. Santos "Modal LPG-based Mach-Zehnder interferometer with controlled sensitivity for refractive index measurement", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 700448 (16 May 2008); https://doi.org/10.1117/12.786093

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