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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2220-8054-2023-14-2-158-163</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-122</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group></article-categories><title-group><article-title>Corrugated non-stationary optical fiber</article-title><trans-title-group xml:lang="ru"><trans-title>Гофрированное нестационарное оптическое волокно</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6484-1226</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ахмаджанов</surname><given-names>Т.</given-names></name><name name-style="western" xml:lang="en"><surname>Akhmadjanov</surname><given-names>T.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Университетская 4, 100174, г. Ташкент</p></bio><bio xml:lang="en"><p>Turgunali Akhmadjanov – Faculty of Physics, Department of Photonics</p><p>University, str.4, 100174, Tashkent</p></bio><email xlink:type="simple">t.akhmadjanov@nuu.uz</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7128-4598</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рахимов</surname><given-names>Э. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Rakhimov</surname><given-names>E. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>улица Чингиза Айтматова, 2Б, 100014, г. Ташкент</p></bio><bio xml:lang="en"><p>Ergashali Yu. Rakhimov</p><p>Chingiz Aitmatov str. 2B, 100014, Tashkent</p></bio><email xlink:type="simple">eyurakhimov@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный университет Узбекистана, физический факультет, кафедра фотоники</institution></aff><aff xml:lang="en"><institution>National University of Uzbekistan</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Национальный научно-исследовательский институт возобновляемых источников энергии при Министерстве энергетики Республики Узбекистан</institution></aff><aff xml:lang="en"><institution>National Scientific Research Institute of Renewable Energy Sources</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>03</day><month>06</month><year>2025</year></pub-date><volume>14</volume><issue>2</issue><fpage>158</fpage><lpage>163</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Akhmadjanov T., Rakhimov E.Y., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Ахмаджанов Т., Рахимов Э.Ю.</copyright-holder><copyright-holder xml:lang="en">Akhmadjanov T., Rakhimov E.Y.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://nanojournal.ifmo.ru/jour/article/view/122">https://nanojournal.ifmo.ru/jour/article/view/122</self-uri><abstract><p>Using numerical methods, we study the fractal properties of the optical paths difference for rays propagating in a model of a homogeneous optical fiber with periodically curved (corrugated) wall and other wall periodically oscillating according to the sine law. Also the angle of entry of the rays into the optical fiber and their coordinates in the exit plane is investigated.</p></abstract><trans-abstract xml:lang="ru"><p>С помощью численных методов исследованы фрактальные свойства разности оптических ходов лучей, распространяющихся в модели оптического волокна c одна стенкой, периодически гофрированная и одна стенкой, периодически колеблющаяся по закону синусоиды, а также угол входа лучей в оптическое волокно и зависимость этого угла от их координат в плоскости выхода.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>численный анализ</kwd><kwd>динамика</kwd><kwd>оптическое волокно</kwd><kwd>гофрировка</kwd><kwd>фазовое изображение</kwd><kwd>оптическая разность путей</kwd><kwd>фрактальность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>numerical analysis</kwd><kwd>dynamics</kwd><kwd>optical fiber</kwd><kwd>corrugation</kwd><kwd>phase image</kwd><kwd>optical path difference</kwd><kwd>fractal property</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Medwin H., Clay C.S. 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