Analysis of radiation scattering by periodic structure of micro cavities in a multimode optical waveguide

Petukhova A.Y., Perminov, A.V., Konin, Y.A., Naparin M.A.

For Russian citation (Opticheskii Zhurnal):

Петухова А.Ю., Перминов А.В., Конин Ю.А., Напарин М.А. Анализ рассеяния излучения периодической структурой микрополостей в многомодовом оптическом волноводе // Оптический журнал. 2025. Т. 92. № 11. С. 3–13. http://doi.org/10.17586/1023-5086-2025-92-11-3-13

Petukhova A.Yu., Perminov A.V., Konin Yu.A., Naparin M.A. Analysis of radiation scattering by a periodic structure of microcavities in a multimode optical waveguide [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 11. P. 3–13. http://doi.org/10.17586/1023-5086-2025-92-11-3-13

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Optical radiation scattered by a periodic micro cavity structure formed in a planar optical waveguide simulating a 62.5/125 μm multimode fiber. Aim of study. Obtaining the distribution of the optical radiation scattered power from a periodic structure of bullet-shaped microcavities on the lateral surface of a flat waveguide based on mathematical modeling, creating a method for assessing the scattering elements efficiency and obtaining the values of the microcavity structure geometric parameters at which the greatest uniformity of scattered radiation is achieved. Method. Mathematical modelling of scattering on a periodic radiation structure was performed in the COMSOL Multyphysics package. The model assumes the possibility of varying the size and mutual arrangement of micro cavities. Main results. Power distributions of scattered radiation with a wavelength of 1310 nm from the side surface of the waveguide were obtained. It is shown that the size and relative location of microcavities significantly affect the power distribution of scattered radiation. A method for estimating the uniformity of the distribution of scattered power along the waveguide is proposed. Practical significance. The results are applicable to a multimode optical fiber with a periodic structure of microcavities that scatters laser radiation. Such a fiber can be used as a source of radiation for medical purposes. Periodic structures can be applied as a sensing element for fiber optic sensors. The results are applicable for the development of diffusers with the most uniform scattered radiation pattern.

Keywords:

optical waveguide, periodic structure of micro cavities, radiation scattering, multimode fiber, bullet-shaped micro cavities

Acknowledgements:

the research was supported by the grant of the Russian Science Foundation № 23-21-00169

OCIS codes: 290.0290, 010.1310

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