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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">ntv</journal-id><journal-title-group><journal-title xml:lang="ru">Научно-технический вестник информационных технологий, механики и оптики</journal-title><trans-title-group xml:lang="en"><trans-title>Scientific and Technical Journal of Information Technologies, Mechanics and Optics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-1494</issn><issn pub-type="epub">2500-0373</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2226-1494-2024-24-4-538-547</article-id><article-id custom-type="elpub" pub-id-type="custom">ntv-67</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>ОПТИЧЕСКИЕ СИСТЕМЫ И ТЕХНОЛОГИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>OPTICAL ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Исследование пироэлектрического эффекта и создание модифицированной конструкции фазового модулятора на основе ниобата лития</article-title><trans-title-group xml:lang="en"><trans-title>Study of pyroelectric effect and creation of modified design of phase modulator based on lithium niobate</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6898-3400</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шулепова</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shulepova</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шулепова Алена Викторовна — инженер</p><p>Санкт-Петербург, 197101</p></bio><bio xml:lang="en"><p>Alena V. Shulepova — Engineer</p><p>Saint Petersburg, 197101</p></bio><email xlink:type="simple">79213040490@ya.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2168-8046</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шулепов</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Shulepov</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шулепов Владимир Андреевич — кандидат технических наук, начальник группы</p><p>Санкт-Петербург, 197101</p></bio><bio xml:lang="en"><p>Vladimir A. Shulepov — PhD, Head of the Group</p><p>Saint Petersburg, 197101</p></bio><email xlink:type="simple">shulepov_vladimir@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7151-9235</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Стригалев</surname><given-names>В. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Strigalev</surname><given-names>V. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Стригалев Владимир Евгеньевич — кандидат физико-математических наук, доцент, профессор, старший научный сотрудник</p><p>Санкт-Петербург, 197101</p></bio><bio xml:lang="en"><p>Vladimir E. Strigalev — PhD (Physics &amp; Mathematics), Associate Professor, Professor, Senior Researcher</p><p>Saint Petersburg, 197101</p></bio><email xlink:type="simple">vstrglv@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Университет ИТМО</institution><country>Россия</country></aff><aff xml:lang="en"><institution>ITMO University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>11</day><month>12</month><year>2024</year></pub-date><volume>24</volume><issue>4</issue><fpage>538</fpage><lpage>547</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Шулепова А.В., Шулепов В.А., Стригалев В.Е., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Шулепова А.В., Шулепов В.А., Стригалев В.Е.</copyright-holder><copyright-holder xml:lang="en">Shulepova A.V., Shulepov V.A., Strigalev V.E.</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://ntv.elpub.ru/jour/article/view/67">https://ntv.elpub.ru/jour/article/view/67</self-uri><abstract><sec><title>Введение</title><p>Введение. В работе рассмотрено явление пироэлектрического эффекта и показано его влияние на возникновение дополнительного фазового сдвига проходящей световой волны в волноводной структуре фотонных интегральных схем, сформированных на подложке кристалла ниобата лития X-среза. Метод. Измерения проводились интерферометрическим способом в схеме волоконно-оптического интерферометра Маха–Цендера с использованием модуляции излучения в опорном плече, позволяющего выполнять непрерывное измерение фазы в плече с исследуемым образцом. Проведен расчет временных параметров каждого из элементов экспериментальной схемы для определения времени релаксации пироэлектрических зарядов.</p></sec><sec><title>Основные результаты</title><p>Основные результаты. Выполнен анализ влияния пироэлектрического дрейфа фазы, его величины и временных характеристик релаксации зарядов, вызывающих дрейф. Предложена модель и исследована конструкция фазового модулятора на основе кристалла ниобата лития с дополнительными обратно Z-ориентированными пластинами, расположенными на электродах модулятора. Обсуждение. Предложенный способ решения проблемы способен компенсировать пироэлектрическое поле и, как следствие, уменьшить паразитный сдвиг фазы.</p></sec></abstract><trans-abstract xml:lang="en"><p>The study explores the phenomenon of the pyroelectric effect and demonstrates its influence on the emergence of an additional phase shift of the passing light wave in waveguide structures of photonic integrated circuits formed on a lithium niobate crystal X-cut substrate. Measurements were carried out using interferometric methods in a Mach-Zehnder fiber-optic interferometer configuration with radiation modulation in the reference arm allowing for continuous phase measurement in the arm with the sample under study. The calculation of the temporal parameters of each element of the experimental setup was performed to determine the relaxation times of pyroelectric charges. An analysis of the contribution of pyroelectric phase drift, its magnitude, and the temporal characteristics of charge relaxation causing the drift was conducted. A model was proposed and the design of a phase modulator based on a lithium niobate crystal with additional back Z-oriented plates located on the modulator electrodes was investigated. The proposed solution method is capable of compensating for the pyroelectric field and, as a result, reducing parasitic phase shift.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>ниобат лития</kwd><kwd>фазовый модулятор</kwd><kwd>пироэлектрический эффект</kwd><kwd>пироэлектрическое поле</kwd></kwd-group><kwd-group xml:lang="en"><kwd>lithium niobate</kwd><kwd>phase modulator</kwd><kwd>pyroelectric effect</kwd><kwd>pyroelectric field</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания Министерства науки и высшего образования Российской Федерации (проект № FSER-2024-0006).</funding-statement><funding-statement xml:lang="en">The research was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (project No. FSER-2024-0006).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Ильичев И.В., Тогузов Н.В., Шамрай А.В. 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