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<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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="oration" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Discrete and Continuous Models and Applied Computational Science</journal-id><journal-title-group><journal-title xml:lang="en">Discrete and Continuous Models and Applied Computational Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Discrete and Continuous Models and Applied Computational Science</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2658-4670</issn><issn publication-format="electronic">2658-7149</issn><publisher><publisher-name xml:lang="en">Peoples' Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">8327</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Conference Report, Theses of Report</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Analysis of Planar Graded-Index Optical Waveguides with Strong Asymmetry of a Refractive Index Proﬁle by the Beam Propagation Method</article-title><trans-title-group xml:lang="ru"><trans-title>Исследование плоских градиентных оптических волноводов с сильной асимметрией профиля показателя преломления методом распространяющегося пучка</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gorobets</surname><given-names>A P</given-names></name><name xml:lang="ru"><surname>Горобец</surname><given-names>Александр Петрович</given-names></name></name-alternatives><bio xml:lang="en">Department of Radiophysics</bio><bio xml:lang="ru">Кафедра радиофизики</bio><email>agorobets@sci.pfu.edu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples’ Friendship University of Russia</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2013-01-15" publication-format="electronic"><day>15</day><month>01</month><year>2013</year></pub-date><issue>1</issue><issue-title xml:lang="en">NO1 (2013)</issue-title><issue-title xml:lang="ru">№1 (2013)</issue-title><fpage>148</fpage><lpage>154</lpage><history><date date-type="received" iso-8601-date="2016-09-08"><day>08</day><month>09</month><year>2016</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2013, Горобец А.П.</copyright-statement><copyright-year>2013</copyright-year><copyright-holder xml:lang="ru">Горобец А.П.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/miph/article/view/8327">https://journals.rudn.ru/miph/article/view/8327</self-uri><abstract xml:lang="en">In the paper application of the beam propagation method (BPM) to investigation of wave processes in regular and nonregular graded-index waveguide structures with strongly asymmetric refractive index proﬁle is analyzed. On purpose to match the BPM requirement to smoothness of the refractive index proﬁle, the proﬁle with strong asymmetry, at the problem solution, is approximately exchanged by a symmetrical one. For exponential and Gaussian proﬁles of the refractive index the BPM calculations are compared to the strict and WKB solution respectively. Calculation of a wave pattern of a mode ﬁeld coupling into the substrate at the tapered edge of a waveguide with strongly asymmetric proﬁle is demonstrated.</abstract><trans-abstract xml:lang="ru">В статье анализируется возможность применения метода распространяющегося пучка (МРП) к исследованию волновых процессов в регулярных и нерегулярных градиентных волноводных структурах с сильно асимметричным профилем показателя преломления. С целью удовлетворить требованию МРП к плавности профиля показателя преломления профиль с сильной асимметрией при решении задачи приближенно заменен симметричным профилем. Для экспоненциального и гауссова профилей показателя преломления результаты вычислений с помощью МРП сравниваются со строгим и с ВКБ-решением соответственно. Продемонстрирован расчет волновой картины излучения моды в подложку на сужающемся крае волновода с сильно асимметричным профилем.</trans-abstract><kwd-group xml:lang="en"><kwd>graded-index optical waveguide</kwd><kwd>beam propagation method</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>градиентный оптический волновод</kwd><kwd>метод распространяющегося пучка</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Sodha M.S., Ghatak A. Neodnorodnye opticheskie volnovody. — M.: Svyaz, 1980. — In Russian.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Adams M. Vvedenie v teoriyu opticheskih volnovodov. — M.: Mir, 1984. — In Russian.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Danielsen P. 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