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Highly sensitive fiber-optic refractometer with an over-offset tilted fiber Bragg grating configuration is proposed based on strong cladding-core recoupling. Reflection with two well-defined bands performs an improved refractive index measurement combining with power self-calibration property.
Tilted fiber Bragg gratings have been demonstrated to be accurate refractometers. Because they require spectral measurements on several tens of nanometers, demodulation techniques reported so far are not suited for quasi-distributed refractive index sensing using TFBGs cascaded along a single optical fiber. We demonstrate here that a commercial OTDR can be used to multiplex identical TFBGs refractometers...
A novel technique for simultaneous measurement of refractive index and temperature based on power level detection of a weakly tilted fiber Bragg grating (TFBG) is proposed and experimentally demonstrated. Surrounding refractive index (RI) and temperature can be unambiguously determined by the TFBG transmitted and reflected power, respectively, avoiding complex wavelength interrogation. An accuracy...
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