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A novel all-fiber refractometer sensor is proposed, which is based on multimode interference in the multimode fiber core section sandwiched between two single-mode fibers. A wide-angle beam propagation method in the cylindrical coordinate is employed as the modeling tool for simulation and design of the proposed refractometer sensor. The design for a refractometer is presented that shows that the refractometer would have an estimated resolution of 5.4×10−5 for refractive indices from 1.33 to 1.45 and of 3.3×10−5 for refractive indices from 1.38 to 1.45 through the choice of an appropriate length of the multimode fiber core section.
Wang, Q., Farrell, G. (2006) All-Fiber Multimode-Interference-Based-Refractometer Sensor:Proposal and Design. Optics Letters, Vol.31 (3), 2006, pp.317-319. doi:10.1364/OL.31.000317