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A method is presented for the construction of W shaped-W shaped solitons and W-shaped soliton combined with other types of solitons to coupled nonlinear partial differential equations (NLPDEs). This method is applied to investigate the propagation of new progressive solitons in magneto-optical waveguides that carry the quadratic-cubic nonlinearity described by a coupled system of nonlinear Schr o ¨ dinger equations. These waveguides have a great advantage since they control solitons' clutter effects and thus assure their smooth propagation across intercontinental distances. Many approaches to investigating the exact solitons and other solutions to nonlinear models are often very powerful and very efficient to deal with single NLPDEs, however they do not always have the same success when applied to coupled NLPDEs. This difficulty is due to the existence of interaction terms in the coupled equations. For this reason, it is not always an easy task to derive exact solutions to these coupled equations. To overcome this difficulty, several authors have attempted to solve coupled equations by making the assumption that the solution in one line is proportional to the solution in another line, leading to an excessive imposition of constraints. This leads to the reduction of coupled equations to a single one. By doing so, they denature the physical phenomena described by the original coupled NLPDEs. We propose here a method that gives a better perspective in handling the analytical investigation of coupled NLPDEs. The novelty lies on the fact that it not only allows the propagation of different types of solutions in two lines to be conducted in just one move, but it also retrieves the propagation of same types of solutions in the two lines. For this latter case, the solutions come naturally with less constraints.The criteria for these solutions to exist are also exhibited in the form of parameter constraints. [ABSTRACT FROM AUTHOR]

In this work, we recover progressive soliton solutions in magneto-optic waveguides having the parabolic-nonlocal law of refractive index. An improved F-expansion approach retrieves solutions in terms of coupled c n − s n , c n − d n , and d n − s n Jacobi elliptic functions. Subsequently, in the limiting approach, when the modulus of ellipticity approaches unity, progressive soliton solutions are retrieved. Under some special parameter values that controlled the existence of these solutions, some representative wave structures are graphically displayed in Figs. 1-6. [ABSTRACT FROM AUTHOR]

To evaluate nonreciprocal phase characteristics of a magneto-optic channel waveguide, the formulation of a finite-element method based on a scalar wave approximation is discussed here for the first time. This problem is ascribed to the problem of solving a nonlinear eigenvalue equation. However, a simple iterative method is proposed here for solving the nonlinear eigenvalue equation. The validity and usefulness of the present method are demonstrated in analyzing magneto-optic rib wave- guides and magneto-optic ridge waveguides. A discussion to increase a nonreciprocal phase shift in those wave- guides also is given. [ABSTRACT FROM AUTHOR]

This paper secures bright, singular and combo optical solitons in magneto-optic waveguides with quadratic-cubic nonlinearity. Subsequently, the multiplier approach reveals three conserved quantities that are computed with the aid of the bright soliton solutions recovered from traveling wave hypothesis. [ABSTRACT FROM AUTHOR]

This paper secures bright and singular perturbed optical solitons in magneto-optic waveguides, having parabolic form of nonlinearity, with traveling wave hypothesis. The conservation laws are subsequently obtained by the multiplier approach and the three conserved quantities are finally listed. [ABSTRACT FROM AUTHOR]