Abstract
A novel sensor is proposed and demonstrated for simultaneous measurement of refractive index (RI) and temperature by splicing a 9.5mm claddingless fiber to a 20.3mm polarization-maintaining fiber in a Sagnac loop. Only two extinct dips are observable from 1400nm to 1700nm in the transmission spectrum of the sensor. One dip induced by Sagnac interference of the Sagnac loop is located near 1520nm, while the other one near 1630nm is the result of multimode interference of the single mode-multimode-polarization maintaining fiber (SMP) structure. Since the dip induced by Sagnac interference is immune to RI, temperature can be solely measured and the RI information can be extracted from the wavelength shift of the other dip with temperature effect compensated. Thanks to the high temperature-sensitivity of Sagnac loop and the high RI sensitivity of the SMP structure, a temperature-sensitivity of 1.929nm/°C is achieved and an average RI-sensitivity reaches up to 235.3nm/RIU.
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