The evolution of a fiber-fuse phenomenon in a single-mode optical fiber was studied theoretically. To clarify both the silica-glass\ndensification and cavity formation, which have been observed in fiber fuse propagation, we investigated a nonlinear oscillation\nmodel using the Van Der Pol equation. This model was able to phenomenologically explain both the densification of the core\nmaterial and the formation of periodic cavities in the core layer as a result of a relaxation oscillation.
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