Abstract

A fiber-optic refractometer based on the multimode interference in the singlemode-multimode-singlemode fiber structure is demonstrated. The refractive index dependence of the shift of re-imaging resonant wavelength of the proposed sensor is investigated. It shows that the proposed sensor has a measurement resolution of 5.4×10<sup>-5</sup> refractive index unit (RIU) for the changes of refractive indices from 1.336 to 1.372. The proposed sensor has a great potential for biological and chemical applications.

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