1. Introduction
In recent years, the research of optical (bright, dark, and singular) solutions for nonlinear Schrödinger equations have played an important role in nonlinear optical media. The optical pulses in the optical solutions play a significant role in communication systems, optical fibers, and so on. Many authors have discussed the optical solutions for the nonlinear Schrödinger equation (NSE) when the nonlinear terms are Kerr law, power law, parabolic law, dual-power law, saturating law, exponential law, higher order polynomial law, and triple-power law (see [
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16,
17]). There are several previous studies which are of great interest in the optical solitons (see [
18,
19,
20,
21,
22]). Ma et al. [
23,
24] have discussed exact solutions to NSEs and Lump solutions to higher order rational dispersion relations. Additionally, Ma [
25] has provided better approximations to real physical nonlinear waves, which could exist in even linear wave models. Recently, Arshed [
3] studied the exact solution for perturbed Schrödinger equations by using the
expansion function method.
In this research, we use the rational solitary solution methods and q-deformed functions methods for the following nonlinear perturbed Schrödinger equation [
2,
3,
4,
7,
8,
9]:
where
represents the linear evolution phenomena,
is dispersion velocity,
is the nonlinear term coefficient,
is the temporal dispersion,
is the self-steepening perturbation term,
is the coefficient of nonlinear dispersion, and
is the power of nonlinear terms. We will ansatz the traveling wave transformation as
where
is the amplitude real function of the wave solution,
is the soliton velocity,
is the frequency of the soliton,
is the wave number, and the phase constant is
. Equation (2) leads to write Equation (1) as
and
Equations (3) and (4) are independent; consequently the soliton velocity is given by
and the constraint condition
2. Analysis of Rational Solitary Solutions Methods (RSSM)
They are many methods to solve nonlinear partial differential equations (NPDEs) such as transformed rational function (TRF) method [
26] and the multiple exp-function (MEF) method [
24,
25]. The RSSM is one of the important applications to the TRF method and MEF methods for solving the NPDEs. The transformation in Equation (2) is applied to transfer the NPDEs to NODEs. We suppose the solutions of the NODEs according to the RSSM have the shape
where the conditions on the two functions
and
take shapes:
and are constants and can be evaluated later, while . The nonlinear auxiliary conditions in Equation (8) can be solved as follows:
If
= 1, the hyperbolic solutions take the following form:
or
If
= −1, the rational periodic solutions take the following form:
or
The homogenous idea of the balance power is used to determine the end sum of the series in Equation (7). Insert Equation (7) with the auxiliary Equation (8) into the NODEs and deduce the system of algebraic equations from comparison between the coefficients of and . Resolve the aforesaid system of equations to and insert the results in the Equation (3) solution to get the solutions of the NPDEs.
Remark 1. The system in Equation (8) can be presented by a single of NODE and it has the same solutions (9)–(12) when .
2.1. Rational Soliton Solution to Nonlinear Perturbed Schrödinger Equations NPSEs with Kerr Law
The nonlinearity Kerr law PNSEs takes the form:
Equations (3) and (4) lead to write PNSEs in Equation (3) as follows
when the soliton velocity is given by
, the condition
, and put
in the nonlinear media to be integrable. Balancing
and
, we get the Equation (14), which can be written in the form:
where
satisfies the conditions in Equation (8) and
are arbitrary constants. The solution formula in Equation (15) is a solution to Equation (14) under the conditions of Equation (8) if and only if:
In this family the solution of PNSEs in Equation (13) take the form:
or
In this family, the solution of PNSEs in Equation (13) take the form:
or
2.2. Rational Soliton Solution to NPSEs with Power Law
The nonlinearity power law PNSEs take the form:
Equations (3) and (4) lead to write PNSEs in Equation (22) as follows:
when the soliton velocity is given by
and
From balance the highest power of
and
, we get
as rational number, and we take the transformation
The transformation in Equation (24) leads to obtain
From
and
, the solution of Equation (21) can be written in the form:
where
satisfies the conditions in Equation (8), and
are arbitrary constants. The solution formula in Equation (26) is a solution to Equation (25) under conditions (8) if and only if:
In this family the solution of PNSEs in Equation (22) takes the form:
or
In this family, the solution of PNSEs in Equation (22) take the form:
or
There are many different other solutions, but we leave it as a kind of convenience.
2.3. Rational Soliton Solution to NPSEs with Quadratic-Cubic Law
The nonlinearity quadratic law PNSEs take the form:
where
and
are constants. Equations (3) and (4) lead to write PNSEs in Equation (33) as follows:
When the soliton velocity is given by
, the condition
Balancing the power of
and
in the series solution in Equation (7) with the restriction in Equation (8), we have
and Equation (28) is integrable when
. Consequently, we set the solution in the following form:
where
satisfies the conditions in Equation (8), and
are arbitrary constants. The solution formula in Equation (35) is a solution to Equation (34) under conditions in Equation (8) if and only if:
In this family the solution of PNSEs in Equation (33) take the form:
or
In this family, the solution of PNSEs in Equation (33) takes the form:
or
There are many different other families, but we leave it as a kind of convenience to the readers.
2.4. Rational Soliton Solution to NPS’s with Anti-Cubic Law
The nonlinearity anti cubic law PNSEs takes the form:
where
,
and
are nonzero constants. Equations (3) and (4) lead to write PNSEs in Equation (34) as follows:
when the soliton velocity is given by
, the condition
From equating the power of terms
and We suppose
, we have
From Equations (44) and (43) we get:
Consequently, we set the solution of Equation (45) in the following form:
where
satisfies the conditions in Equation (8), and
are arbitrary constants. The solution formula in Equation (46) is a solution to Equation (45) under conditions of Equation (8) if and only if:
In this family, the solution of PNSEs in Equation (42) takes the form:
or
In this family, the solution of PNSEs in Equation (42) takes the form:
or
There are many different other families, but we leave it as a kind convenience to the readers.
3. Q-Deformed Hyperbolic Functions Method to NPSEs
Many authors have introduced the definition of q-deformed hyperbolic functions (see, for example, [
7,
12,
13,
14]). The q-deformed hyperbolic functions are defined by
and
There are many applications of q-deformed hyperbolic and trigonometric functions to NPDEs (see [
26]). In the q-deformed hyperbolic functions methods, we suppose the solution of NODEs in the following form:
3.1. Kerr Law
From Type 1, we suppose the solution to NPSEs in Equation (14) in the form in Equation (53). The formula in Equation (53) is a solution to Equation (14) when
, hence
Substituting Equation (57) into Equation (14) and setting the coefficients of , , to be zero, we acquire the system equations, which can be solved to get:
In this set, the solution to NPSEs in Equation (13) is
In this set, the solution to NPSEs in Equation (13) is
For the type 2. the solutions of the NPSEs in Equation (13) are given by:
3.2. Power Law
From Type 1, we suppose the solution to NPSEs in Equation (25) in the form in Equation (53). The formula in Equation (53) is a solution to Equation (25) when
, consequently we have:
Equation (65) is a solution to Equation (25) when
In this set, the solution to NPSEs in Equation (22) is
In this set, the solution to NPSEs in Equation (22) is
For the type 2. The solutions of the NPSEs in Equation (22) are given by:
where
and
where
.
3.3. Quadratic-Cubic Law
From Type 1, we suppose the solution to NPSEs in Equation (34) in the form in Equation (53). The formula in Equation (53) is a solution to Equation (34) when
, and Equation (34) is integrable when
. Suppose a solution of Equation (34) in the following form:
Equation (72) is a solution of Equation (34) when
In this set, the solution to NPSEs in Equation (33) is
In this set, the solution to NPSEs in Equation (33) is
In this set, the solution to NPSEs in Equation (33) is
For the type 2. The solutions of the NPSEs in Equation (33) are given by
where
and
.
where
and
.
where
and
.
3.4. Anti-Cubic Law
From Type 1, we suppose the solution to NPSEs in Equation (45) in the form in Equation (53). The formula in Equation (53) is a solution to Equation (45) when
. Suppose a solution of Equation (45) in the following form:
Equation (82) is a solution of Equation (45) when
In this set, the solution to NPSEs in Equation (45) is
In this set, the solution to NPSEs in Equation (42) is
In this set, the solution to NPSEs in Equation (42) is
For the type 2. The solutions of the NPSEs in Equation (42) are given by
where
,
and
.
where
,
and
where
,
and
,
and
.
4. Q-Deformed Trigonometric Functions Method
Many authors have defined the q-deformed trigonometric functions in [
7,
12,
13,
14,
26] as
and
In the q-deformed trigonometric functions methods, we suppose the solution of Equation (14) in the following form:
4.1. Kerr Law
From Type 3, we suppose the solution to NPSEs in Equation (14) in the form in Equation (92). The formula in Equation (92) is a solution to Equation (14) when
, hence
Substituting Equation (96) into Equation (14) and setting the coefficients of , , to be zero, we acquire the system equations which can be solved to have:
In this set, the solution to NPSEs in Equation (13) is
In this set, the solution to NPSEs in Equation (13) is
In this set, the solution to NPSEs in Equation (13) is
For the type 4. The solutions of the NPSEs in Equation (13) are given by:
where
and
.
where
and
.
where
and
.
4.2. Power Law
From Type 3, we suppose the solution to NPSEs in Equation (25) in the form in Equation (92). The formula in Equation (92) is a solution to Equation (25) when
; consequently we have:
Equation (106) is a solution to Equation (25) when
In this set, the solution to NPSEs in Equation (22) is
In this set, the solution to NPSEs in Equation (22) is
For the type 4. The solutions of the NPSEs in Equation (22) are given by:
where
and
where
4.3. Quadratic-Cubic Law
From Type 3, we suppose the solution to NPSEs in Equation (34) in the form in Equation (92). The formula in Equation (92) is a solution to Equation (34) when
, and Equation (34) is integral when
. Suppose a solution of Equation (34) in the following form:
Equation (113) is a solution of Equation (34) when
In this set, the solution to NPSEs in Equation (33) is
For the type 4. The solutions of the NPSEs in Equation (33) are given by:
where
and
4.4. Anti-Cubic Law
From Type 3, we suppose the solution to NPSEs in Equation (45) in the form in Equation (92). The formula in Equation (92) is a solution to Equation (45) when
. Suppose a solution of Equation (45) in the following form:
Equation (117) is a solution of Equation (45) when
In this set, the solution to NPSEs in Equation (42) is
In this set, the solution to NPSEs in Equation (42) is
In this set, the solution to NPSEs in Equation (42) is
For the type 4. The solutions of the NPSEs in Equation (42) are given by
where
,
and
where
, and
.
where
and
,
5. Behavior of Soliton Solutions
In this section we plot the two- and one-dimensional solutions when the parameters take some suitable values to determine the type of the optical solutions. We show the effect of the parameter q in the q-deformed functions in optical solutions. We plot the absolute value of the complex exact solution to discuss the amplitude of the soliton solutions. In
Figure 1, we plot the traveling wave solution (17) when the parameters take the values
and
. We get a singularity at
x = −1.4 when the velocity of solion is equal to 2 and the wave number is 4; consequently the soliton solution in Equation (17) is the singular soliton solution while in the
Figure 2, the soliton solutions in Equation (18) is periodic singular solution.
Figure 3 presents the exact solution of Equation (59) when
is the bright soliton equations while the exact Equation (80) in the
Figure 4 is dark soliton equations.
Figure 5 illustrates the periodic soliton Equation (119) when
.
6. Conclusions
In this paper, we applied some interesting algebraic methods to find a variety of explicit solutions to nonlinear perturbed Schrödinger equations when the nonlinear parts take different terms: nonlinear Kerr law, power law, quadratic-cubic law, and anti-cubic law. In this article, we construct the rational solitary solutions, q-deformed hyperbolic solutions, and q-deformed trigonometric solutions for one of the important equations in optical media which has many applications in optics and communications. Through our study that we conducted on the non-linear Schrödinger equation, it is clear that the proposed methods are effective methods in finding the soliton solutions. The drawings studied during this work illustrate the different optical solutions that have many applications in optics.
Funding
Taif University Researchers Supporting project number (TURSP-2020/16), Taif university, Taif, Saudi Arabia.
Acknowledgments
The author thanks Taif university researchers for supporting project number (TURSP-2020/16), Taif university, Taif, Saudi Arabia.
Conflicts of Interest
The authors declare no conflict of interest.
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