Suppression of stimulated Brillouin scattering effect using nonlinear phase modulation

Achieving maximum optical amplifier or repeater spacing in fiber-optic transmission system is compromised by the input power limit due to stimulated Brillouin scattering (SBS). In digital transmission, SBS causes bit error rate degradation. In this paper, we have established analytical model for spectral broadening due to self-phase- and cross-phase modulation and using this broadening, SBS effect is significantly suppressed by raising the SBS threshold power level. The spectral width of propagating signal broadens due to nonlinear phase modulation which ultimately increases the SBS threshold power and results transfer of relatively high optical power as well as longer span length without backscattering.