Abstract
A method is presented by which analytically solvable N-coupled nonlinear Schrödinger and coupled quadratic equations are found for which the nonlinear coupling parameters of the equations can take up wide ranges of values and cover many regions. Specific results for N = 2 and 3 are presented. These results have potentially useful applications to problems in nonlinear optics and the dynamics of multispecies Bose-Einstein condensates.