为了分析布喇格光纤激光器中光纤的温度分布特性，提出了布喇格光纤激光器中光纤的稳定热模型，通过热传输方程分析了其中的温度分布，并采用数值有限元法对布喇格光纤的温度分布和由此产生的热应力进行了数值研究,然后对热功率密度、光纤包层数和环境对流传热系数对光纤温度分布的影响进行了模拟计算。结果表明,表层温度远低于覆层材料的临界值300℃，而且纤芯和表面的温差大约10℃。研究结果有助于高功率布喇格光纤激光器的耐热设计。

In order to study the temperature property of the fiber in a Bragg fiber laser, the steady thermal model was presented. The temperature distribution was analyzed based on heat transfer equations. The temperature distribution and the thermally-induced stress in the fiber were simulated by means of numerical finite-element method. Effects of thermal power density, number of cladding layers and environmental convection coefficient on the temperature distribution were discussed. The results show that the temperature of coating is much lower than its critical temperature 300℃, and the temperature difference between the core and coating is only about 10℃. The result of analysis is helpful to the design of Bragg fiber lasers.