AbstractWe have developed a theoretical model that analytically predicts the nonlinear phase shift, which is due to Stimulated Brillouin Scattering (SBS) in two different types of optical fibers, a Standard Single-mode fiber (SMF) and a conventional Dispersion Compensating (DCF) fibre. Theoretical analysis based on the SBS effect yields a good description of the nonlinear phase shift of the output pump and Stokes wave characteristics in a strong saturation regime. A comparison of the two optical fibers is presented. With input pump power of 16 dBm, optical fiber length 11 km at the power ratio of 0.05, the predicted nonlinear phase shift of the output pump power and the Stokes power of SMF and DCF are about 79.58° and 97.92°, respectively. The nonlinear phase shift of the output pump power and of the Stokes power is higher when 11 km (6.7 km) DCF fiber length is used, as compared to the SMF of the same length. The nonlinear phase shift to the output pump power (the Stokes power) of DCF was less (more) than 8% (5%) for SMF at maximum input pump power.