INFLUENCE OF RAMAN-SCATTERING ON THE CROSS-PHASE MODULATION IN OPTICAL FIBERS

The effect of Raman scattering on co-propagation of two short optical pulses is considered. The intra pulse Raman scattering causes the self -frequency shift of each pulse. The effect of the inter pulse Raman sc attering is to enhance the frequency shift while the stimulated Raman scattering (SRS) term suppresses (enhances) the frequency shift if the center frequency difference between the optical pulses falls to the r ight (left) of the Raman gain peak. An expression for the frequency sh ift as a function of the propagation distance is obtained.