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Computer vision-based method of pre-alignment of a channel optical waveguide and a lensed fiber
P.V. Karnaushkin 1,2, M.S. Sklyarenko 1

1 Perm State National Research University, 614990, Perm, Russia, Bukireva st. 15;
2 Perm Federal Research Center, Ural Branch, Russian Academy of Sciences, 614990, Perm, Russia, Lenin st. 13a

 PDF, 2024 kB

DOI: 10.18287/2412-6179-CO-919

Pages: 71-82.

Full text of article: Russian language.

Abstract:
The work is devoted to a technique of pre-alignment of a lensed fiber and a channel waveguide of a photonic integrated circuit using computer vision methods. The design and main units of a machine vision system with illumination of the adjusted objects in reflected light are described. The technique includes detection of the spatial position of the end face of the photonic integrated circuit, fixed at an angle of 90 ± 1° to the horizontal axis of the frame, detection of the coordinates of the end face of the lensed fiber, and the subsequent correction of the position of the lensed fiber using a manipulator system. We propose a method of searching and selecting a single line corresponding to the end face of a photonic integrated circuit using a Hough transform; methods for grouping discontinuous contours of the lensed fiber and true contour determination. These methods are based on a priori knowledge of the lens geometry. Also, we describe options for suppressing noise and overcoming various defects in images. It has been shown experimentally that the error of angle determination of a lensed fiber depends on the distance between the lens and the end face of the photonic integrated circuit. The presented technique makes it possible to determine the longitudinal and angular displacements between the fiber lens and the end face of the photonic integrated circuit with errors less than 4 μm and 0.05°, respectively.

Keywords:
photonic integrated circuit, waveguide, lensed fiber, machine vision, alignment.

Citation:
Karnaushkin PV, Sklyarenko MS. Computer vision-based method of pre-alignment of a channel optical waveguide and a lensed fiber. Computer Optics 2022; 46(1): 71-82. DOI: 10.18287/2412-6179-CO-919.

Acknowledgements:
The work was conducted as part the project "Design and development of production technology of a miniature general-purpose resonant optical gyroscope" (Contract No. 2/549/2020 of 23.07.2020) within the “Program of state support for leading companies involved in the development and introduction of products, services and platforms aimed at digitization of key sectors of the economy and social sphere”.

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