We discuss the internal structure of microcavities in single-mode and multi-mode acrylate- and polyimide-clad optical fibers due to fusion occurring as a plasma spark propagates through the core. The calculated plasma propagation speed was 61 +/- 2 cm/s. The structure of the microcavities was studied from the end and side surfaces of the fibers, and the microcavities had sizes of 2.7 +/- 0.5 mu m and 5.6 +/- 0.7 mu m, respectively, when viewed from each of these two directions. The ultimate strengths of damaged and undamaged single-mode fibers were determined via two-point bending and the axial tension method. It was experimentally determined that following the damage to the core, the flexure strength of fibers with each type of protective coating decreased by 5%-8%, while the tensile strength of the fibers with polyimide coating decreased by 72%-83%, and the tensile strength of the fibers with acrylate coating decreased by 26%-30%. (C) 2021 Optica Publishing Group
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