Abstract

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 $5.4\times {10}^{-5}$ for refractive indices from 1.33 to 1.45 and of $3.3\times {10}^{-5}$ for refractive indices from 1.38 to 1.45 through the choice of an appropriate length of the multimode fiber core section.

© 2006 Optical Society of America

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