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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="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Journal of Communications Technology and Electronics</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Communications Technology and Electronics</journal-title><trans-title-group xml:lang="ru"><trans-title>Радиотехника и электроника</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0033-8494</issn><issn publication-format="electronic">3034-5901</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">682385</article-id><article-id pub-id-type="doi">10.31857/S0033849424120022</article-id><article-id pub-id-type="edn">HNGGBK</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ELECTRODYNAMICS AND RADIO WAVE PROPAGATION</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ЭЛЕКТРОДИНАМИКА И РАСПРОСТРАНЕНИЕ РАДИОВОЛН</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Surface electromagnetic fields of cladding modes of coreless optical fibers</article-title><trans-title-group xml:lang="ru"><trans-title>Поверхностные электромагнитные поля оболочечных мод бессердцевинных волоконных световодов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Abel’mas</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Абельмас</surname><given-names>М. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>abelmax1998@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanov</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Иванов</surname><given-names>О. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Ulyanovsk Branch<italic> </italic></p></bio><bio xml:lang="ru"><p>Ульяновский филиал </p></bio><email>abelmax1998@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ulyanovsk State Technical University</institution></aff><aff><institution xml:lang="ru">Ульяновский государственный технический университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Kotelnikov Institute of Radio Engineering and Electronics RAS</institution></aff><aff><institution xml:lang="ru">Институт радиотехники и электроники им. В.А. Котельникова РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2024</year></pub-date><volume>69</volume><issue>12</issue><fpage>1150</fpage><lpage>1161</lpage><history><date date-type="received" iso-8601-date="2025-06-03"><day>03</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://innoscience.ru/0033-8494/article/view/682385">https://innoscience.ru/0033-8494/article/view/682385</self-uri><abstract xml:lang="en"><p>The exact hybrid modes of a coreless optical fiber are calculated. Spatial distributions of electromagnetic fields near the cladding surface are obtained. A comparison of radial, azimuthal, and longitudinal field components near the cladding surface is performed for the hybrid exact modes and approximate linearly polarized (<italic>LP</italic>) modes. The polarization characteristics of the modes are studied taking into account the longitudinal field component depending on the type of hybrid modes and mode numbers. The combination of hybrid modes forms modes similar to <italic>LP</italic> modes, which have an almost uniform linear polarization inside the fiber far from the cladding surface. It is shown that under the cladding surface the polarization of <italic>LP</italic>-like modes is also linear, but significantly non-uniform in azimuthal angle with a deviation of the polarization angle by up to 21<sup>о</sup> from the main direction of mode polarization. In addition, the role of the longitudinal field component near the cladding surface increases significantly, where its value can exceed the values of the transverse components.</p></abstract><trans-abstract xml:lang="ru"><p>Рассчитаны точные гибридные моды бессердцевинного оптического волокна. Получены пространственные распределения электромагнитных полей вблизи поверхности оболочки. Проведено сравнение радиальных, азимутальных и продольных компонент поля вблизи поверхности оболочки для гибридных точных мод и приближенных линейно-поляризованных (<italic>LP</italic>) мод. Исследованы поляризационные характеристики мод с учетом продольной компоненты поля в зависимости от типа гибридных мод и модовых чисел. Комбинация гибридных мод формирует моды, подобные <italic>LP</italic>-модам, имеющие почти однородную линейную поляризацию внутри волокна вдали от поверхности оболочки. Показано, что под поверхностью оболочки поляризация <italic>LP</italic>-подобных мод также линейна, однако существенно неоднородна по азимутальному углу с отклонением угла поляризации на величину до 21<sup>о</sup> от основного направления поляризации моды. Кроме того, значительно возрастает роль продольной компоненты поля вблизи поверхности оболочки, где ее величина может превышать величины поперечных компонент.</p></trans-abstract><kwd-group xml:lang="en"><kwd>optical fiber</kwd><kwd>fiber mode</kwd><kwd>cladding mode</kwd><kwd>surface field</kwd><kwd>hybrid modes</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>оптическое волокно</kwd><kwd>волоконная мода</kwd><kwd>оболочечная мода</kwd><kwd>поверхностное поле</kwd><kwd>гибридные моды</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of the Russian Federation</institution></institution-wrap></funding-source></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Волоконно-оптические датчики / Под ред. Э. Удда. 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