Evanescent field refractive index sensor utilizing a narrow fiber Bragg grating and a tunable DBR laser

Adel Asseh; Simon Sandgren; Henrik Ahlfeldt; Bengt Sahlgren; Raoul Stubbe; Gunnar N.E. Edwall

doi:10.1117/12.260578

10 December 1996 Evanescent field refractive index sensor utilizing a narrow fiber Bragg grating and a tunable DBR laser

Adel Asseh, Simon Sandgren, Henrik Ahlfeldt, Bengt Sahlgren, Raoul Stubbe, Gunnar N.E. Edwall

Author Affiliations +

Proceedings Volume 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII; (1996) https://doi.org/10.1117/12.260578
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

We have demonstrated an evanescent field refractive index fiber sensor comprising a 42 mm Bragg grating in an etched fiber together with a tunable DBR laser. Characterization of different aqueous sucrose solutions resulted in a resolution of roughly 10 mM sucrose. The sensor in the presented form has a theoretical sensitivity of higher than 10^-5 refractive index units (riu) in a refractive index region close to the cladding index of the fiber. However, the technique allows for an even higher sensitivity than 10^-6 riu with a proper signal processing scheme.

Citation Download Citation

Adel Asseh, Simon Sandgren, Henrik Ahlfeldt, Bengt Sahlgren, Raoul Stubbe, and Gunnar N.E. Edwall "Evanescent field refractive index sensor utilizing a narrow fiber Bragg grating and a tunable DBR laser", Proc. SPIE 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII, (10 December 1996); https://doi.org/10.1117/12.260578

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