Thirring Solitons in the presence of dispersion
  The effect of dispersion or diffraction on zero-velocity solitons is studied for the generalized massive Thirring model describing a nonlinear optical fiber with grating or parallel-coupled planar waveguides with misaligned axes. The Thirring solitons existing at zero dispersion/diffraction are shown numerically to be separated by a finite gap from three isolated soliton branches. Inside the gap, there is an infinity of multi-soliton branches. Thus, the Thirring solitons are structurally unstable. In another parameter region (far from the Thirring limit), solitons exist everywhere. 
Alan R Champneys (1) Boris A Malomed (2) Mark J friedman (3) ((1)   University of Bristol, (2) Tel Aviv University, (3) Univ...