ANALYSIS OF COHERENT AND INCOHERENT INTERACTIONS OF AMPLITUDE SHIFTEDSOLITONS IN OPTICAL FIBERS

Nonlinear interaction between pulses can severely reduce the bit-rate of an optical communication system. One way of reducing this interacti on is amplitude shifting of consequtive pulses. In the present work a detailed analytical and numerical investigation is made of the coheren t and incoherent interactions between two soliton pulses of unequal am plitudes. For the case of coherent interaction the obtained expression s for the pulse parameters in terms of initial phase and amplitude dif ferences give a clear and explicit prediction of the reduction of the interaction strength for unequal soliton amplitudes. A comparison with numerical simulation results shows good agreement. For the case of in coherent soliton interaction it is found that the dependence of the in teraction strength on the amplitude difference is weak.