Research for temperature distribution characteristics of the fiber in a Bragg fiber laser

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.