Simulation of fiber fuse phenomenon in photonic crystal fibers

The unsteady-state thermal conduction process in several photonic crystal fibers (PCFs) was studied theoretically by the explicit finite-difference method using the thermochemical SiOx production model. The threshold power Pth for fiber fuse propagation in these PCFs was one order of magnitude higher than that for conventional single-mode optical fibers (SMFs). These results agreed with the experimental results. Pth of the triangular-lattice PCF was 69 W, and the resistance of this PCF to high-power irradiation was superior to that of SMF. The threshold power density for the honeycomb-structure PCF and/or triangular-lattice PCF was about 45 times larger than that of conventional SMFs.