Fig. 1. Diagram of experimental setup of optical fiber temperature sensor

Fig. 2. Output results of laser. (a) Output spectra under different pump powers; (b) output power characteristic curve; (c) reflection and transmission spectra of the FBG; (d) output spectra under different pump powers with left end as output end

Fig. 3. Laser output spectrum recorded every 240 s under 300 mW pump power

Fig. 4. Output spectra measured at different temperatures. (a) Heating; (b) cooling

Fig. 5. Central wavelength of sensor as a function of temperature