Collision of Akhmediev Breathers in Nonlinear Fiber Optics

Recently nonlinear fiber optics has revealed the existence of ``breathers,'' a new form of solitons with periodic oscillations on a finite background. But, how do such breathers, when they appear at the same time, interact with each other? A new experiment demonstrates that two such breathers, when their initial shapes and propagations are properly controlled, can collide to make a new giant ``rogue'' wave.