THE DISTRIBUTED-FEEDBACK OF COUNTER-PROPAGATING WAVES IN A PERIODICALLY MODULATED MEDIUM WITH RELAXING CUBIC NONLINEARITY

An interaction of two counter-propagating waves in a periodically modu lated medium with relaxing cubic nonlinearity is considered. On the ba sis of analytical solutions of the equations under the weak distribute d feedback (DFB) approximation, we show that an increase in the reflec tivity of 'nonlinear' DFB-structures takes place due to phase mismatch ing between the radiation and the light-induced grating. We carry out a numerical simulation of the obtained equations for arbitrary values of the coupling coefficient, Bragg detuning and incident pulse intensi ty. We also analysed the dynamics of the regular temporal modulation o f initially continuous wave radiation caused by the 'nonlinear' gratin g.