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A novel intensity-modulated fiber Bragg grating (FBG) sensor system employing fiber dispersion is presented. A RF signal is generated at a photodetector by two modulated optical signals reflected from a sensing and a reference FBG. Bragg wavelength shift of the sensing FBG changes intensity of the RF signal due to a fiber dispersion-induced phase change, with temperature effect being compensated automatically...
A novel fiber Bragg grating (FBG) sensor configuration using three broadband light sources of different wavelength bands for the interrogation of FBG sensors distributed over 75 km of fiber is proposed and demonstrated. Rayleigh backscattering was reduced and a 60-dB effective dynamic range was demonstrated.
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