A cascaded Raman fiber laser (RFL) based on standard mono mode silica fiber and fiber Bragg gratings is fabricated. Pumped by a Yb doped double clad fiber laser, output power of the second Stokes wave around 1176 nm is obtained. The maximal total output power of the RFL is up to 309 mW, and the slope efficiency of the 1176.8 nm output is about 51.5%. Pulses with a repetition rate of 2.9 μs are observed in the laser output when the pump power is near to the threshold. However, when the pump power reaches to a value high enough, stable continue wave output power is achieved.