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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">tuzsut</journal-id><journal-title-group><journal-title xml:lang="ru">Труды учебных заведений связи</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of Telecommunication Universities</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1813-324X</issn><issn pub-type="epub">2712-8830</issn><publisher><publisher-name>СПбГУТ</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">tuzsut-27</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="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>ИССЛЕДОВАНИЕ ВЛИЯНИЯ ОТКЛОНЕНИЯ ГЕОМЕТРИИ ПРОМЫШЛЕННЫХ ОБРАЗЦОВ МАЛОМОДОВЫХ ОПТИЧЕСКИХ ВОЛОКОНОТ ОПТИМАЛЬНОЙ ФОРМЫ НА ДЕГРАДАЦИЮ СПЕКТРАЛЬНОЙ ХАРАКТЕРИСТИКИ ДИФФЕРЕНЦИАЛЬНОЙ МОДОВОЙ ЗАДЕРЖКИ</article-title><trans-title-group xml:lang="en"><trans-title>RESEARCH OF REAL FEW-MODE OPTICAL FIBER GEOMETRY DEVIATION FROM THE OPTIMAL FORM INFLUENCE ON DIFFERENTIAL MODE DELAY SPECTRAL CHARACTERISTICS DEGRADATION</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Андреев</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Andreev</surname><given-names>V. ..</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бурдин</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Bourdine</surname><given-names>A. ..</given-names></name></name-alternatives><email xlink:type="simple">bourdine@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бурдин</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Burdin</surname><given-names>V. ..</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Поволжский государственный университет телекоммуникаций и информатики<country>Россия</country></aff><aff xml:lang="en">Povolzhskiy State University of Telecommunication &amp; Informatics<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>07</day><month>04</month><year>2021</year></pub-date><volume>4</volume><issue>2</issue><fpage>18</fpage><lpage>25</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Андреев В.А., Бурдин А.В., Бурдин В.А., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Андреев В.А., Бурдин А.В., Бурдин В.А.</copyright-holder><copyright-holder xml:lang="en">Andreev V..., Bourdine A..., Burdin V...</copyright-holder><license 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://tuzs.sut.ru/jour/article/view/27">https://tuzs.sut.ru/jour/article/view/27</self-uri><abstract><p>В работе представлены результаты теоретического исследования влияния отклонения геометрии промышленных образцов маломодовых оптических волокон от оптимальной формы на деградацию спектральной характеристики дифференциальной модовой задержки. Рассматривались несимметричные некруглые кварцевые 16-модовые оптические волокна 42/125 с уменьшенной за счет предварительно оптимизированной специализированной формы градиентного профиля показателя преломления дифференциальной модовой задержки в "С"-диапазоне длин волн с внесенными локальными флуктуациями показателя преломления. Эллиптичность сердцевины и вариации профиля задавались на основе анализа протоколов измерения профилей показателя преломления промышленных образцов многомодовых оптических волокон 50/125 кат. ОМ2 и ОМ2+/ОМ3.</p></abstract><trans-abstract xml:lang="en"><p>This work presents some results of theoretical research of few-mode optical fiber geometry deviation from the optimal form influence on differential mode delay spectral characteristics degradation. We considered non-symmetrical non-circular 16-mode optical fibers 42/125 with reduced differential mode delay over “C”-band provided by special refractive index profile form. Optimized profile form was distorted by local refractive index fluctuations. Core ellipticity and profile distortions were set via parameters been got by reports of real commercially available multimode optical fibers 50/125 Cat. OM2 and OM2+/OM3 refractive index profile measurements.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>маломодовые оптические волокна</kwd><kwd>маломодовый режим передачи оптического сигнала</kwd><kwd>дифференциальная модовая задержка</kwd><kwd>несимметричные оптические волокна</kwd><kwd>профиль показателя преломления</kwd></kwd-group><kwd-group xml:lang="en"><kwd>few-mode optical fibers</kwd><kwd>few-mode regime of optical signal transmission</kwd><kwd>differential mode delay</kwd><kwd>non-symmetrical optical fibers</kwd><kwd>refractive index profile</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">Kubota H., Morioka T. 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