Dispersive wave emission in dual concentric core fiber: the role of   soliton-soliton collisions
  Soliton-soliton collisions have a crucial role in enhancing the spectrum of dispersive waves in optical fibers and collisions among in-phase solitons lead to a dramatic enhancement of the dispersive wave power, as well as to its significant spectral reshaping. We obtained a simple analytical model to estimate the spectral position, width and amplitude of the dispersive waves induced by a collision of two in-phase solitons. We tested our theory in the case of a dual concentric core microstructured fiber. 
Alessandro Tonello, Daniele Modotto, Katarzyna Krupa, Alexis   Labruy\`ere, Badr Shalaby, Vincent Couderc, Alain Barth\'el\'...
physics.optics