<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2021000400106</article-id>
<article-id pub-id-type="doi">10.31349/revmexfis.67.040705</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Modulation analysis and optical solitons of perturbed nonlinear Schrödinger equation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Houwe]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sabi&#8217;u]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Betchewe]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Inc]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
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<surname><![CDATA[Doka]]></surname>
<given-names><![CDATA[S. Y.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Maroua Faculty of Science Department of Physics]]></institution>
<addr-line><![CDATA[Maroua ]]></addr-line>
<country>Cameroon</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Northwest University Kano Faculty of sciences Department of Mathematics]]></institution>
<addr-line><![CDATA[Kano ]]></addr-line>
<country>Nigeria</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Firat University Science Faculty Department of Mathematics]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Turkey</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,China Medical University China Medical University Hospital Department of Medical Research]]></institution>
<addr-line><![CDATA[Taichung ]]></addr-line>
<country>Taiwan</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,the University of Ngaoundere Faculty of Science Department of Physics]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cameroon</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2021</year>
</pub-date>
<volume>67</volume>
<numero>4</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2021000400106&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2021000400106&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2021000400106&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We investigate modulation analysis and optical solitons of perturbed nonlinear Schrödinger equation (PNLSE). The PNLSE has terms of cubic nonlinearity and self-steepening and spatio-temporal dispersion (STD). Proposed model has been studied by [14, 15] without selfsteepening term. The presence of the STD can help to compensate the low GVD to the model. Bright and dark solitary waves, trigonometric, periodic and singular optical solitons are obtained by some expansion methods including exponential and sinh-Gordon. Obtained results will hold a significant place in the field of nonlinear optical fibers, where solitons are used to codify data.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Optical soliton]]></kwd>
<kwd lng="en"><![CDATA[perturbed nonlinear Schrödinger equation]]></kwd>
<kwd lng="en"><![CDATA[instability modulation]]></kwd>
</kwd-group>
</article-meta>
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