A novel narrow linewidth, discretely tunable and stable fiber ring laser based on the matching of the transmission spectra
of two fiber Bragg grating Fabry-Perot (FBG-FP) filters is proposed in this paper. We studied the characteristics of this
sort of tunable fiber laser both theoretically and experimentally, and obtained eight discretely tunable lasing wavelengths
from 1552.24 nm to 1552.912 nm with an average 96 pm spacing, by pulling one of the FBG-FPs. The output of the
laser at the discrete wavelengths specified by the transmission maximum of the fixed FBG-FP is quite stable, and the
fluctuation of the output power is less than 0.1dB.