In the past decades, interests in exploiting Orbital Angular Momentum (OAM) as a new degree of freedom for encoding the information in optical communication channels have been enhanced. Research results show that OAM modulation can increase the data transmission capacity of next generation networks. All-optical wavelength conversion and amplification of OAM carriers provide the possibility of using them in commercial communication systems based on Wavelength Division Multiplexing (WDM) technique. In this paper, nonlinear Stimulated Raman Scattering (SRS) interaction and its effect on wavelength conversion and amplification of pulses carrying OAM have been studied. The results prove the conservation of OAM during the wavelength conversion that leads to conservation of modulated information.