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The nonlinear oscillation model using the Van der Pol equation was able to phenomenologically explain the formation of periodic cavities, the cavity shape, and the regularity of the cavity pattern in the core layer as a result of the relaxation oscillation and cavity compression and/or deformation. We assumed the relationships between the parameters of the population dynamics of interacting self-oscillators using the Kuramoto model and the fiber fuse propagation, and found an equation describing the power dependence of the periodic cavity interval. The experimentally determined cavity intervals at Pth · P0 · 5W satisfied this equation. Furthermore, the experimental cavity intervals at P0 È 6W can be explained by considering the power dependence of the propagation velocity of the fiber fuse and the constant period of the Van der Pol oscillator. [ABSTRACT FROM AUTHOR]

The evolution of both the core melting and fiber fuse phenomena in a single-mode fiber-optic connector was studied theoretically. Carbon black was chosen as a light-absorbent material. A thin absorbent layer with a thickness of 1 µm order was assumed to be formed between the fiber end faces in the connector. When a high-power laser operating at 1.48 or 1.55 µM was input into the connector, the temperature on the fiber core surface increased owing to heat conduction fromthe light-absorbent material. The heat flow process of the core, which caused the core to melt or the fiber fuse phenomenon, was theoretically calculated with the explicit finite-difference method. The results indicated that initial attenuation of less than 0.5 dB was desirable to prevent core fusion in the connectors when the input 1.48 µm laser power was 1W. It was found that a core temperature of more than 4000K was necessary to generate and maintain a fiber fuse. [ABSTRACT FROM AUTHOR]