A novel erbium doped fiber ring laser utilizing amplified spontaneous emission (ASE) as a secondary pump source so that it can operate in L band stably was demonstrated. The output wavelength can be tuned in a wide range of 45 nm, from 1560 nm to 1605 nm, by changing the status of a polarization controller in the cavity. The relationship between the output power and the splitting ratio of the output coupler is also studied in this paper.