This study fabricated an ultra-high refractive index sensor based on tapered no-core fiber involving a simple inexpensive process. A splice section of no-core fiber in the middle of single mode fiber was tapered to small diameters. The sensor was sensitive to the surrounding refractive index with a large measurement range of 1.3330–1.4437. The refractive index sensitivity differed with varying wavelengths, with a value of 41916 nm/RIU at approximately 1550 nm. It yielded a low temperature sensitivity of 8.1 pm/°C that can be ignored compared with the refractive index sensitivity. The proposed fiber optic refractive index sensor can be used in many fields such as medicine and biochemical applications.
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