Refractive index sensing using a multimode interference-based fiber sensor in a cavity ring-down system

Susana Silva; Orlando Frazão

doi:10.1117/12.2263437

23 April 2017 Refractive index sensing using a multimode interference-based fiber sensor in a cavity ring-down system

Susana Silva, Orlando Frazão

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103232M (2017) https://doi.org/10.1117/12.2263437
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

This work presents a multimode interference-based fiber sensor in a cavity ring-down system for sensing temperature-induced refractive index (RI) changes of water. The sensing head is based in multimodal interference (MMI) and it was placed inside the fiber loop cavity of the CRD system. A modulated laser source was used to send pulses down into the fiber loop cavity and an erbium-doped fiber amplifier (EDFA) was placed in the fiber ring to provide an observable signal with a reasonable decay time. The behavior of the sensing head to temperature was studied due to its intrinsic sensitivity to said parameter — a sensitivity of -1.6×10^-9 μs/°C was attained. This allowed eliminating the temperature component from RI measurement of water and a linear sensitivity of 580 μs/RIU in the RI range of 1.324–1.331 was obtained.

Citation Download Citation

Susana Silva and Orlando Frazão "Refractive index sensing using a multimode interference-based fiber sensor in a cavity ring-down system", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103232M (23 April 2017); https://doi.org/10.1117/12.2263437

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KEYWORDS

Fiber optics sensors

Head

Water

Sensing systems

Brain-machine interfaces

Refractive index

Multimode fibers

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