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DOI: 10.17586/1023-5086-2021-88-10-65-77
УДК: 535.015
Analyzing the optical modes and vortex signals in an optical fiber by means of side illumination
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Publication in Journal of Optical Technology
Виноградова И.Л., Салихов А.И., Мешков И.К., Гизатулин А.Р., Султанов А.Х., Багманов В.Х. Анализ оптических мод и вихревых сигналов в оптоволокне методом бокового просвечивания // Оптический журнал. 2021. Т. 88. № 10. С. 65–77. http://doi.org/10.17586/1023-5086-2021-88-10-65-77
Vinogradova I.L., Salikhov A.I., Meshkov I.K., Gizatulin A.R., Sultanov A.Kh., Bagmanov V.Kh. Analyzing the optical modes and vortex signals in an optical fiber by means of side illumination [in Russian] // Opticheskii Zhurnal. 2021. V. 88. № 10. P. 65–77. http://doi.org/10.17586/1023-5086-2021-88-10-65-77
I. L. Vinogradova, A. I. Salikhov, I. K. Meshkov, A. R. Gizatulin, A. Kh. Sultanov, and V. Kh. Bagmanov, "Analyzing the optical modes and vortex signals in an optical fiber by means of side illumination," Journal of Optical Technology. 88(10), 597-605 (2021). https://doi.org/10.1364/JOT.88.000597
This article discusses a new method for instrumentally (experimentally) finding the mode-distribution parameters of an optical signal propagating along an optical fiber. The proposed method is based on illuminating the optical fiber from the side, followed by investigating the image for the linear and nonlinear (with the Kerr component) cases and then recalculating the mode parameters using the proposed technique. Unlike known methods of analyzing mode distributions that operate only with end irradiation of the optical fiber and are implemented only at definite points of a line with an intermittent signal transmitted along it, the proposed method does not assume breakage of the optical line and can be used at any point along it. The measurement layout is based on the well-known experimental apparatus, intended to obtain the refractive-index profile of an optical fiber. In addition to the known layout, it is proposed to make measurements at various angular positions of the optical fiber of interest and at various longitudinal positions along it. The proposed method can be implemented when the signal that propagates along the optical fiber is characterized by increased intensity, and this makes it possible to record the nonlinear (Kerr) component of the main refractive-index profile.
mode compositions in optical fiber, nonlinear refractivity variation, refractive-index profile, mode weight coefficients, side illuminating of the optical fiber
Acknowledgements:This study was carried out with the help of a grant of the Ministry of Science and Higher Education of the Russian Federation as part of the work on State Assignment of FSBEI HE USATU No. FEUE-2020-0007 on the topic “Theoretical foundations of modeling and semantic analysis of the processes of transformation of vortex electromagnetic fields in infocommunication systems.”
OCIS codes: 060.2300, 060.2330
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