Pérez Herrera, Rosa AnaSoares, LilianaNovais, SusanaFrazão, OrlandoSilva, Susana2023-11-162023-11-162023Pérez Herrera, R. A., Soares, L., Novais, S., Frazão, O., & Silva, S. (2023). Erbium-doped fiber ring cavity for the measurement of refractive index variations. En M. Wuilpart & C. Caucheteur (Eds.), European Workshop on Optical Fibre Sensors (EWOFS 2023) (p. 20). SPIE. https://doi.org/10.1117/12.2678101978-1-5106-6500-210.1117/12.2678101https://academica-e.unavarra.es/handle/2454/46760In this work, an erbium-doped fiber ring cavity based on a 3dB optical coupler for refractive index measurements is presented and experimentally verified. This interrogation system, based on a 1 x 2 optical coupler, uses one of these output ports to increase the reflected optical power by means of a fiber Bragg Grating (FBG), used as a reflector. Moreover, the other output port is used as a refractive index sensing head. A spectral analysis of this interrogator system as well as a fiber cavity ring refractive index sensor characterization are carried out. Finally, an experimental comparison of the refractive index sensor range when the 3dB coupler is replace by a 1x3 one is also presented.application/pdfengCopyright 2023 Society of Photo Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, or modification of the contents of the publication are prohibited.Amplified spontaneous emissionErbium-doped fiberRefractive index measurementsinfo:eu-repo/semantics/conferenceObject2023-11-16info:eu-repo/semantics/openAccess