These changes will weaken the ability of the fiber to limit the light field, which is beneficial to the leakage of the light field energy and interact with the analyte, thereby improving the detection capability.Therefore, thequadraticpolynomialfittingcurve of Fig. 4 shows that the maximum sensitivity at 1.43 is 32,434nm/RIU.Amaximumresolutionof3.08×10−6 RIU can be obtained by assuming the spectrometer resolution of Δλ = 0.1 nm.