Abstract
This paper integrates dispersive optical solitons in special optical metamaterials with a time dependent coefficient. We obtained some optical solitons of the aforementioned equation. It is shown that the examined dependent coefficients are affected by the velocity of the wave. The first integral method (FIM) and ansatz method are applied to reach the optical soliton solutions of the one-dimensional nonlinear Schrödinger’s equation (NLSE) with time dependent coefficients.
1 Introduction
The dynamics of optical solitons propagating through optical fibers for trans-continental and trans-oceanic distances is governed by the nonlinear Schrödinger’s equation (NLSE). This NLSE is derived from Maxwell’s equation in electromagnetic by the aid of multiple-scale perturbation analysis. The NLSE appears, in the literature of optical solitons, with several forms of nonlinearity that depends on the context where it is studied. The best known mathematical modeling of optical systems generally is expressed by types of NLSE. The details of NLSE are given in the studies on nonlinear optics [1–8].
It is crucial to reach general solutions of these corresponding nonlinear equations. Thus, the general solutions of these equations provide much information about the character and the structure of the equations for researchers. Many effective methods have been improved to provide much information for physicians and engineers. Some of these methods are Tanh [9], G′/G-expansion [10], Jacobi elliptic function [11], functional variable [12], Hirota bilinear [13], exp-function [14], and first integral methods [15]. All of these methods are effective methods for acquiring traveling wave solutions for NPDE.
The FIM initially has been presented to the literature by solving the Burgers-KdV equation by Feng [15]. This method has been successfully implemented to NPDE and some fractional differential equations, which are a new type of equations. In recent years, many studies on this method have been made. Raslan [16] has used this method for the Fisher equation. Tascan and Bekir [17] have used this method for the Cahn-Allen equation. Abbasbandy and Shirzadi [18] have investigated the Benjamin BonaMohany equation by this method. Jafari et al. [19] and Hosseini et al. [20] have researched w.r.t. the Biswas–Milovic equation, the KP equation, and so on [21–24].
For this paper, we present the governing equation for metamaterials in Section 2. The FIM is described and applied in Section 3. In order to construct the combined soliton solutions, an ansatz approach is applied in Section 4. Lastly, we give some conclusions in the last section.
2 Governing equation
Soliton pulse propagation properties in complex materials with simultaneous negative real dielectric permittivity and magnetic permeability, also known as double negative materials, have attracted much attention in recent research. These types of materials are not found in nature, but rather need to be fabricated through material processed engineering. Therefore, these materials are called metamaterials [25]. In recent years, the model equation that describes the propagation of solitons and other waves through these metamaterial waveguides has been studied by many researchers. One of these studies is by Ebadi and co-workers: the tanh function method [26, 27]. We have used the aforementioned equation with additional terms that account for the metamaterials as
where a, b, α, λ, μ, and φj are the group velocity dispersion, Kerr law nonlinearity, coefficient of intermodal dispersion, coefficient of self-steepening, nonlinear dispersion, and real-valued constants that account for specific metamaterials which were introduced earlier and reported in [26].
3 The first integral method
The principal structures of the FIM are as follows:
Step 1. Taking into account the usual NPDE as:
then Equation (2) transforms the ODE as
such that ξ = x ∓ ct and H′ = ∂H(ξ)/∂ξ.
Step 2. The following can be taken in ODE (3):
Step 3. A new independent variable is produced by
which produces a new system of ODEs:
Step 4. In accordance with the qualitative theory of ODEs [28], if it is possible to find the integrals for system (6), the solutions of system (6) can be obtained immediately. On account of the particular independent plane system, there does not exist any approximation that can guide how to reach its first integrals. The Division Theorem (DT) [29] presented us an idea how to reach the first integrals.
3.1 Application
Equation (1) turns into the following ODEs by using the wave variable h = H(ξ) ei[−κx+wt], where ξ = β(x - vt). The real and imaginary parts yield the following pair of relations
If we differentiate (7) once by ξ, we get
Then by equating the right side of(9) to
In (10) and (11), Hξξ can be replaced in (8) instead of
Then with another transformation Hξ = G, we have
In accordance with the FIM, it is supposed that H (ξ) and G (ξ) are non-trivial solutions of Equation (13) and
where ai(H), (i = 0, 1, 2,... , r) are polynomials of H and ar(H)/ = 0. Equation (12) is the first integral for system (13), owing to the DT, there exists g(H) + f(H)G in C[H, G] as:
Here, we only consider r = 1 in Equation (15).
If we equate the coefficients of Gi(i = 0, 1, 2,... , r) of Equation (15) for r = 1, we have
Since ai(H)(i = 0, 1) is a polynomial of H, a1(H) is a constant and h(H) = 0 from (16). For convenience, let a1(H) = 1, and equalizing the degrees of g(H) and a0(H) we conclude the degree of g(H) is equal to one. Then, we assume that g(H) = A1 + 2A2H, and we obtain the following from Equations (17) and (18):
Replacing a0(H), a1(H) and g(H) in Equation (18), to separate the common factors of the same terms, then equating the coefficients of H i to zero, we have the following case:
Putting (20) into (14), we have
If we solve the Equations (21), we have the following dark soliton solution
and the original solution of Equation (2) is
4. The Ansatz approach
We use an ansatz approach to seek other types of soliton solutions of Equation (1).
First, Equation (12) will be integrated to reach the combined bright-dark [30] soliton solution of Equation (1). So we will seek a solution of the following form
where θ0 and θ1 are amplitudesof the bright and dark solitons, respectively.
By substituting (22) into (12) and setting the coeffi-cients of each term of sechi [ξ] tanhj [ξ] (i, j = 0, 1, 2) to zero we get the following relations:
From (25) the combined bright-dark soliton solution of Equation (1) is obtained:
Second, Equation (12) will be integrated to reach the combined-dark soliton solution of Equation (1). So we will seek a solution of the following form
where θ0 and θ1 (θ0 > 0, θ1 > 0) are the amplitudes of the dark and bright solitons, respectively.
By substituting (27) into (12) and setting the coeffi-cients of each term of sechi [ξ] tanhj [ξ] (i, j = 0, 1, 2) to zero we get the following relations:
From (28) it is the combined-dark soliton solution of Equation (1) is obtained:
Third, Equation (12) will be integrated to reach the combined-bright soliton solution of Equation (1). So we will seek a solution of the following form
where θ0 and θ1 (θ0 > 0, θ1 > 0) are the amplitudes of the dark and bright solitons, respectively.
By substituting (30) into (12) and setting the coeffi-cients of each term of sechi [ξ] tanhj [ξ] (i, j = 0, 1, 2) to zero we get the following relations as (28) and the combinedbright soliton solution of Equation (1) is obtained:
5. Conclusion
We used the FIM and antsatz approaches for acquiring several new exact solutions of the one-dimensional NLSE with time dependent coefficients. We have acquired different types of exact solutions which are dark, combined-bright, and combined-dark optical solitons. These obtained solutions are new according to our research of the literature. It has been shown that the velocity function w(t) is related to the group velocity term a(t) in (28). Consequently, the FIM and ansatz approaches are crucial ones to construct different types of the exact solutions of the NPDE and systems.
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- Droplet spreading and permeating on the hybrid-wettability porous substrates: a lattice Boltzmann method study
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- POD-Galerkin Model for Incompressible Single-Phase Flow in Porous Media
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Effect of the Pore Size Distribution on the Displacement Efficiency of Multiphase Flow in Porous Media
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Numerical heat transfer analysis of transcritical hydrocarbon fuel flow in a tube partially filled with porous media
- Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
- Experimental Investigation on Oil Enhancement Mechanism of Hot Water Injection in tight reservoirs
- Special Issue on Research Frontier on Molecular Reaction Dynamics
- Role of intramolecular hydrogen bonding in the excited-state intramolecular double proton transfer (ESIDPT) of calix[4]arene: A TDDFT study
- Special Issue on Research Frontier on Molecular Reaction Dynamics
- Hydrogen-bonding study of photoexcited 4-nitro-1,8-naphthalimide in hydrogen-donating solvents
- Special Issue on Research Frontier on Molecular Reaction Dynamics
- The Interaction between Graphene and Oxygen Atom
- Special Issue on Research Frontier on Molecular Reaction Dynamics
- Kinetics of the austenitization in the Fe-Mo-C ternary alloys during continuous heating
- Special Issue: Functional Advanced and Nanomaterials
- Colloidal synthesis of Culn0.75Ga0.25Se2 nanoparticles and their photovoltaic performance
- Special Issue: Functional Advanced and Nanomaterials
- Positioning and aligning CNTs by external magnetic field to assist localised epoxy cure
- Special Issue: Functional Advanced and Nanomaterials
- Quasi-planar elemental clusters in pair interactions approximation
- Special Issue: Functional Advanced and Nanomaterials
- Variable Viscosity Effects on Time Dependent Magnetic Nanofluid Flow past a Stretchable Rotating Plate