Fig. 1. Schematic diagram of the experimental setup of the RFL. PM, power meter.

Fig. 2. Output power versus pump power for rt of 4%, 25%, and 50%, respectively.

Fig. 3. Output spectra of the RFL measured at different times; (a)–(c) correspond to rt=4%, (d)–(f) correspond to rt=50%. The pump power is 67.7 mW.

Fig. 4. Output spectra of the stable and single mode emission when heating different locations of the FBG array. In the experiment, rt=4% and the pump power is 67.7 mW.

Fig. 5. Output spectra of the stable and single mode emission when heating different locations of the FBG array. In the experiment, rt=50% and the pump power is 67.7 mW.

Fig. 6. Peak wavelength and peak power of the selected modes versus time. In the experiment, rt=4% and the pump power is 67.7 mW.

Fig. 7. Peak wavelength and peak power of the selected modes versus time. In the experiment, rt=4% and the pump power is 67.7 mW.

Fig. 8. Peak wavelength of the stable and single mode emission versus control location for rt of 4% and 50%, respectively.