Based on introducing the principle of wavelength tuning of FBG

a kind of ring Er-Doped Fiber Laser(EDFL) whose wavelength was tuned by FBG was designed. The output lasing wavelength between 1 547.7 nm and 1 556.5 nm can be tuned continuously within the temperature range from 20 to 170 ℃. The tuning linearity is up to 99.96%

the 3 dB linewidth is less than 0.05 nm and the 20 dB linewidth is less than 0.08 nm. While the side mode suppression ratio(SMSR) is more than 52 dB

the output power of EDFL is up to 21.2 mW. Experimental results show that the tunable EDFL has the advantages of wide bandwidth

high power

narrow linewidth and compatibility to fiber element.