title: High sensitivity SMS fiber structure based refractometer--analysis and experiment.
abstract: We have investigated the influence of multimode fiber core (MMFC) diameters and lengths on the sensitivity of an SMS fiber based refractometer. We show that the MMFC diameter has significant influence on the refractive index (RI) sensitivity but the length does not. A refractometer with a lower MMFC diameter has a higher sensitivity. Experimental investigations achieved a maximum sensitivity of 1815 nm/ RIU (refractive index unit) for a refractive index range from 1.342 to 1.437 for a refractometer with a core diameter of 80 μm. The experimental results fit well with the numerical simulation results.
authors.affiliation: Photonics Research Centre, School of Electronic and Communications Engineering, Dublin Institute of Technology, Dublin, Ireland. qiang.wu@dit.ie
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wu
authors.forename: Yuliya
authors.initials: Y
authors.lastname: Semenova
authors.forename: Pengfei
authors.initials: P
authors.lastname: Wang
authors.forename: Gerald
authors.initials: G
authors.lastname: Farrell
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012680:Sensitivity and Specificity