The MBEFL can be continuously tuned over 22 nm from 1547 to 1569 nm by adjusting the BP wavelength.After increasing another section of optical fiber at the branch of ring cavity, we experimentally get the output spectrum with triple Brillouin frequency spacing. It indirectly verifies the possibility of the laser output with adjustable N (N=1,2,3, …) times Brillouin frequency spacing at the expense of the optical fibers and power.