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Distributed Measurement Based on Tapered FBG with OFDR

This paper presents a new approach of simultaneous measurement of temperature and strain using tapered fiber Bragg grating (TFBG) based on optical frequency-domain reflectomery (OFDR). This combination allows us to detect the peak wavelength and spectral width of the TFBG by distributed measuring the reflection peak at each location of the TFBG with high spatial resolution. The spectral width of the grating depends uniquely on the applied strain and is temperature independent. According to this characterization, the strain temperature cross-sensitivity issues can be solved. A measurement error of ±2°C and ±10με was achieved in the experimental verification.