Multi-point refractometry using tilted fiber Bragg gratings interrogated by a time-domain technique

C. Caucheteur; M. Wuilpart; P. Mégret; J. Albert

doi:10.1117/12.835417

5 October 2009 Multi-point refractometry using tilted fiber Bragg gratings interrogated by a time-domain technique

C. Caucheteur, M. Wuilpart, P. Mégret, J. Albert

Author Affiliations +

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75036M (2009) https://doi.org/10.1117/12.835417
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

Tilted fiber Bragg gratings (TFBGs) have been demonstrated to be accurate refractometers. Because they require spectral measurements over several tens of nanometers, most demodulation techniques reported so far are not suited for quasi-distributed refractive index sensing with TFBGs cascaded along an optical fiber. In a recent work, we demonstrated that an optical time domain reflectometer (OTDR) can be used to multiplex identical TFBGs refractometers. Based on this principle, we present here a quasi-distributed refractive index sensor with improved dynamic range where a long-period grating stops the TFBGs Bragg reflections going back to the OTDR.

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C. Caucheteur, M. Wuilpart, P. Mégret, and J. Albert "Multi-point refractometry using tilted fiber Bragg gratings interrogated by a time-domain technique", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75036M (5 October 2009); https://doi.org/10.1117/12.835417

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