All-optical Switching In New Nonlinear X-junctions

We found numerically all-optical switching in novel nonlinear X-junctions, where one branch is made from Kerr like material, while the others from linear one. The output port of the signal light can be switched by the power of control light. The unbalance of nonlinearity between branches causes all-optical switching. Fig. 1 shows the nonlinear X-junction we proposed. It consists of four single-mode branches with different width. The branch-3 had Kerr like nonlinearity. The signal light is launched to the branch-2 and control light to the branch-1.