INFLUENCE OF THE RAMAN-EFFECT ON SOLITONS IN OPTICAL FIBERS

Solitons in optical fibers in presence of Raman effect can form quasi- stationary asymmetric pulses. Radiation of energy away from the solito ns always exists but this can be ignored over a range of soliton param eters. We show numerically that arbitrary initial conditions converge to these soliton profiles. Another form of quasi-stationary solutions rue bound stales of pairs of these solitons. Although they are unstabl e, the bound states can propagate long distances without changes in th eir profile. We have also investigated numerically collisions of solit ons in presence of Raman effect.