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Opt Lett. 2006 Feb 1;31(3):317-9.

All-fiber multimode-interference-based refractometer sensor: proposal and design.

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Applied Optoelectronics Centre, School of Electronics and Communications Engineering, Dublin Institute of Technology, Ireland.


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 x 10(-5) for refractive indices from 1.33 to 1.45 and of 3.3 x 10(-5) for refractive indices from 1.38 to 1.45 through the choice of an appropriate length of the multimode fiber core section.

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