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Abstract <p>Mathematical models are considered for the design of laser input–output ports enabling efficient optical mode transfer between optical fibers and waveguide channels of a photonic integrated circuit via a diffraction grating. Optimal geometric parameters of diffraction gratings are determined to minimize optical losses when using laser radiation at the wavelength of 1550 nm. The calculations were performed for “diffraction grating”–“planar optical waveguide” systems formed within a titanium dioxide cladding layer with high refractive index contrast on the surface of thin-film lithium niobate, considering varying thicknesses of the TiO<sub>2</sub> and LiNbO<sub>3</sub> layers.</p>

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Design of Diffraction Gratings for Efficient Input–Output Interfaces in Thin-Film Lithium Niobate Photonic Integrated Circuits

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • G. A. Lemeshevskaya,
  • P. V. Volkov,
  • D. E. Nikolichev,
  • A. I. Bobrov,
  • A. V. Nezhdanov,
  • L. M. Vinogradova,
  • O. S. Vyazankin,
  • E. I. Yurtova,
  • K. V. Sidorenko,
  • N. V. Malekhonova,
  • A. B. Chigineva

摘要

Abstract

Mathematical models are considered for the design of laser input–output ports enabling efficient optical mode transfer between optical fibers and waveguide channels of a photonic integrated circuit via a diffraction grating. Optimal geometric parameters of diffraction gratings are determined to minimize optical losses when using laser radiation at the wavelength of 1550 nm. The calculations were performed for “diffraction grating”–“planar optical waveguide” systems formed within a titanium dioxide cladding layer with high refractive index contrast on the surface of thin-film lithium niobate, considering varying thicknesses of the TiO2 and LiNbO3 layers.