By controlling the transmitted resonant wavelength of a Fabry-Perot filter, stable single frequency laser output which corresponding to one of the reflected wavelength of a five fiber Bragg grating wavelength division multiplexing (WDM) array acted as selective reflector was obtained and with slope efficiency of ～0.09. Experiment demonstrated that the lasing threshold is related to the grating′s reflectivity and the gain of the erbium-doped fiber at the working wavelength. Continuous tuning within the range of 1530 nm to 1575 nm was achieved with the grating array replaced by a board band reflective mirror.