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Precise correction of integrated optical power splitters based on lithium niobate substrates by photorefractive effect local excitation

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Abstract

A method for precise adjustment of the power splitting ratio for integrated optical splitters fabricated on lithium niobate substrates is proposed. The method is based on a local refractive index change caused by the photorefractive effect under external illumination of certain areas of waveguide power splitters. A fiber optic probe was used for precise positioning of an external illumination spot. Predictable tuning of the splitting ratio for two basic splitter configurations (directional couplers and y-branches) was demonstrated. Precise adjustment of the power splitting ratio in a relatively narrow range (2%) led to a significant growth in the Mach–Zehnder modulator extinction ratio (as high as 17 dB, from 30 to 47 dB). The proposed method is simple and can prove to be a very promising additive technique for improvement of lithium niobate integrated optical schemes.

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Acknowledgements

The work was supported by the Russian Science Foundation, Project  19-19-00511.

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Authors and Affiliations

  1. Ioffe Institute, Politekhnicheskaya 26, St. Petersburg, 194021, Russia

    Mikhail Parfenov, Alexander Tronev, Igor Ilichev, Petr Agruzov & Aleksandr Shamrai

  2. Peter the Great St. Petersburg Polytechnic University, Politekhnicheskaya 29, St. Petersburg, 195251, Russia

    Mikhail Parfenov

  3. ITMO University, Kronverkskiy pr. 49, St. Petersburg, 197101, Russia

    Alexander Tronev

Authors
  1. Mikhail Parfenov
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  2. Alexander Tronev
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  3. Igor Ilichev
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Correspondence to Mikhail Parfenov.

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Parfenov, M., Tronev, A., Ilichev, I. et al. Precise correction of integrated optical power splitters based on lithium niobate substrates by photorefractive effect local excitation. Appl. Phys. B 126, 93 (2020). https://doi.org/10.1007/s00340-020-07440-5

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