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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">Photonics Russia</journal-id><journal-title-group><journal-title xml:lang="en">Photonics Russia</journal-title><trans-title-group xml:lang="ru"><trans-title>Фотоника</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1993-7296</issn><issn publication-format="electronic">2686-844X</issn><publisher><publisher-name xml:lang="en">Technosphera JSC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">642244</article-id><article-id pub-id-type="doi">10.22184/1993-7296.FRos.2024.18.6.470.484</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>Волоконно-оптические устройства и технологии</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">Methods for Measuring Return Loss in Fiber Optic Lines and Components</article-title><trans-title-group xml:lang="ru"><trans-title>Методы измерения обратных потерь в волоконно-оптических линиях и компонентах</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-5118-6368</contrib-id><name-alternatives><name xml:lang="en"><surname>Bychkov</surname><given-names>S. B.</given-names></name><name xml:lang="ru"><surname>Бычков</surname><given-names>С. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>junior research scientist</p></bio><bio xml:lang="ru"><p>м. н. с.</p></bio><email>photonics@technosphera.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pogonyshev</surname><given-names>A. O.</given-names></name><name xml:lang="ru"><surname>Погонышев</surname><given-names>А. О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>junior research scientist</p></bio><bio xml:lang="ru"><p>м. н. с.</p></bio><email>photonics@technosphera.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tikhomirov</surname><given-names>S. V.</given-names></name><name xml:lang="ru"><surname>Тихомиров</surname><given-names>С. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. of Science (Eng.), postgraduate teacher</p></bio><bio xml:lang="ru"><p>д. т. н., преподаватель аспирантуры</p></bio><email>photonics@technosphera.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sumkin</surname><given-names>V. R.</given-names></name><name xml:lang="ru"><surname>Сумкин</surname><given-names>В. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>general director</p></bio><bio xml:lang="ru"><p>генеральный директор</p></bio><email>photonics@technosphera.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Federal State Budgetary Institution “All-Russian Scientific Research Institute of Optical and Physical Measurements” (FGBU “VNIIOFI”)</institution></aff><aff><institution xml:lang="ru">«ВНИИОФИ»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">LLC “Research and Development Enterprise “Measuring Communication Technology” (“Izmeritelnaya Tekhnika Svyazi”) (NPP “ITS”)</institution></aff><aff><institution xml:lang="ru">«НПП «Измерительная техника связи»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-11-25" publication-format="electronic"><day>25</day><month>11</month><year>2024</year></pub-date><volume>18</volume><issue>6</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>470</fpage><lpage>484</lpage><history><date date-type="received" iso-8601-date="2024-11-26"><day>26</day><month>11</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-11-26"><day>26</day><month>11</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Bychkov S.B., Pogonyshev A.O., Tikhomirov S.V., Sumkin V.R.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Бычков С.Б., Погонышев А.О., Тихомиров С.В., Сумкин В.Р.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Bychkov S.B., Pogonyshev A.O., Tikhomirov S.V., Sumkin V.R.</copyright-holder><copyright-holder xml:lang="ru">Бычков С.Б., Погонышев А.О., Тихомиров С.В., Сумкин В.Р.</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/1993-7296/article/view/642244">https://journals.eco-vector.com/1993-7296/article/view/642244</self-uri><abstract xml:lang="en"><p>This article discusses 3 methods for measuring of optic return loss (ORL) in fiber optic systems being used in modern measuring instruments: continuous wave method (CW), time domain reflectometry (OTDR) and frequency domain reflectometry (OFDR). The authors perform a comparative analysis of these methods, and consider the advantages and limitations of these methods.</p></abstract><trans-abstract xml:lang="ru"><p>В статье рассматриваются 3 метода измерения величины обратных потерь (ORL) в волоконно-оптических системах, применяемые в современных измерительных приборах – метод измерений на непрерывном излучении (CW), метод рефлектометрии во временной области (OTDR) и метод рефлектометрии в частотной области (OFDR). Проводится сравнительный анализ этих методов, рассматриваются преимущества и ограничения.</p></trans-abstract><kwd-group xml:lang="en"><kwd>measurements</kwd><kwd>optical return loss</kwd><kwd>ORL</kwd><kwd>reflectometry</kwd><kwd>OTDR</kwd><kwd>OFDR</kwd><kwd>metrological support</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>измерение</kwd><kwd>оптические обратные потери</kwd><kwd>ORL</kwd><kwd>рефлектометрия</kwd><kwd>OTDR</kwd><kwd>OFDR</kwd><kwd>метрологическое обеспечение</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Listvin A. V., Listvin V. N. Fiber optics reflectometry. Moscow. 2005; IBSN 5-902367-03-04. (In Russ.) Листвин А. В., Листвин В. Н. Рефлектометрия оптических волокон. - Москва, ЛЕСАРТ, 2005. 208 c; IBSN 5-902367-03-04.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Soller B. J., Gifford D. K., Wolfe M. S., Froggatt M. E. Optical Backscatter Reflectometry (OBR). 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