The unsteady-state thermal conduction process in several photonic crystal fibers (PCFs) was studied theoretically by the explicit finite-difference method using the thermochemical SiO_x production model. The threshold power $P_{\mathit{th}}$ 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. $P_{\mathit{th}}$ 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.

理论上，采用热化学SiO _x产生模型，通过显式有限差分法研究了几种光子晶体光纤（PCF）中的非稳态热传导过程。阈值功率$P_{\mathit{日}}$在这些PCF中，光纤熔丝的传播比传统的单模光纤（SMF）高一个数量级。这些结果与实验结果一致。$P_{\mathit{日}}$三角晶格PCF的最大功率为69 W，并且该PCF对大功率辐射的抵抗力优于SMF。蜂窝结构PCF和/或三角形晶格PCF的阈值功率密度大约是传统SMF的45倍。