We disconnect between the marked points A and B at the ring cavity shown in Fig.1(a). Then we experimentally connect another 25.2 km SMF to the setup by linking the ports 1 and 3 of cir4 to the point A and B respectively.Three Stokes lines with triple Brillouin frequency spacing are observed under a fixed 980 nm pump power of 110 mW and 5 dBm BP powers in Fig.4.