Approximate analytical description for the nonlinear   -symmetric coupled-mode equations

In this paper, we present an approximate analytical description of the solutions dynamics of nonlinear   -symmetric coupled-mode equations which can be used to realize the nonlinear   -symmetric optical configuration. By the multiple-scale analysis, we construct the asymptotic solutions of the coupled-mode equations. In the   -symmetry unbroken region, there is a good agreement between the asymptotic solutions and exact numerical …