H. J. B. de Oliveira, T. H. C. De Barros, Allamys A. D. Da Silva, J. F. do Nascimento, J. Martins-Filho
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Refractive Index Sensor based on Hetero-core fiber Interrogated by a Laser/photodetector at 1550 nm
We present an investigation of a hetero-core fiber optic refractive index sensor that performs measurements under the 1550 nm wavelength for chemical and biological applications. The structure is formed by a no-core fiber (N CF) spliced to a multimode optical fiber at each of its ends, forming a Multimode / No-core fiber / Multimode (MNM) structure, where the NCF fiber is the sensing part of the structure. The simple and low-cost interrogation scheme uses a laser and a photodetector. The sensor is able to measure refractive index variations with a resolution of $9.93\times 10^{-5}$ RIU.
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