Bi-tapered fiber sensor using visible to near infrared light

The spectral transmission properties of a bi-tapered optical fiber sensor are studied at wavelengths from 720 nm to 920 nm. The wavelengths of interest were generated using a fiber-based, supercontinuum light source that we constructed. The sensitivity of our fiber sensor was examined with water-glycerol mixture using different weight concentrations of glycerol. The wavelength sensitivity is boosted by an order of magnitude above our earlier design with reproducible results. We use the phase analysis of the data and also report a novel and strong correlation with the signal's Fourier amplitude.