A single-wavelength Brillouin laser is demonstrated by using a 3-m-long erbium doped fiber (EDF) in a ring cavity.The EDF is used to provide both nonlinear and linear gains to generate a stimulated Brillouin scattering (SBS)and to amplify the generated SBS,respectively.The Brillouin erbium fiber laser (BEFL) operates at 1561.5 nm,where the operating wavelength is up-shifted by 0.08nm from the Brillouin pump.The operation wavelength is also tunable within 1560.6-1562.6nm.The BEFL also shows a self-pulsing characteristic with repetition of 66.7kHz when the BP is set around the threshold pump power of 13 m W.Compared to the conventional Brillouin fiber laser with a long cavity length,the proposed BEFL exhibits a significantly lower amplitude of pulse.This laser has many potential applications,such as in optical communication and sensors.