A novel Er3+/Yb3+ co-doped fiber ring laser, which utilizes amplified spontaneous emission (ASE) as a secondary pump source so that it can operate in L-band, is demonstrated. Using a high-birefringence fiber loop mirror (HiBi-FLM) as the wavelength filter, which contains two-section high-birefringence fiber and two polarization controllers (PC), and by setting the polarization controllers properly, the reflection spectrum of the loop mirror can be adjusted to let the laser operate in only one mode, and the output wavelength can be tuned in a wide range of 60 nm, from 1559.2 nm to 1619.4 nm. The stability of the laser is very good, and the output power of the laser at different wavelengths can also be flatten within 0.7 dB. Under the maximum pump power of 3594.5 mW, the absorbed pump power by the fiber is measured to be 2737.37 mW and the maximum output power obtained is 300 mW, the slop efficiency is 11%. The laser emits a line with a 3-dB band width of 0.18 nm, and the side mode suppression ratio is greater than 38 dB.