Hybrid WDM-TDM Fiber Bragg Grating Sensor Based on Wavelength Slicing

In this paper we propose and implement the simultaneous interrogation of high and low reflectance fiber Bragg grating (FBG) sensors in both the wavelength and the time domain by utilizing a single conventional broadband laser source. Our results have confirmed the ability of the wavelength domain section of the proposed scheme to resolve the cross strain and temperature measurements of 300 µe and 50°C. Consecutively the time domain section of the setup showed the full ability to cover up the temperature measurement range of 75°C with excellent linearity