Coherent collision between photorefractive screening-photovoltaic bright spatial solitons

In order to understand the interaction between two or multiple screening-photovoltaic bright spatial solitons,the interaction was numerically simulated. Both in-phase solitons attract each other and soliton fusions do occur at a certain interaction length,which increases monotonously with their initial separation. While in the case of out-of-phase,both the solitons repel each other with a force decreasing monotonously with the initial separation. When the relative phase between the solitons falls within the ranges of(0,π)and(-π,0),energy transfers in reverse direction. When the multiple solitons are in-phase,they will attract each other and the inner ones will fuse together gradually. When the relative initial phase between any two adjacent solitons is π/2,energy transfers among them. When the colliding solitons are out of phase,they propagate stably. The result indicate that the change of interaction between both solitons controlled by relative phase can be applied in all optical switch,and that the interaction result of multiple spatial solitons may be useful for the formation of soliton array and waveguide array.