中文摘要：

基于热粘弹流变理论,利用时温等效原理,建立熔融光纤玻璃在非均匀温度场条件下的热粘弹数值模型。通过在拉锥过程中不断修正、调整单元特性与边界条件,对耦合器熔融拉锥流变制造过程进行热力耦合数值分析。获得工艺参数如熔融温度、拉锥速度等对流变制造过程的影响。结果显示：拉锥速度与光纤内部的最大等效应力成正比,熔融温度对器件流变制造过程的影响极大,温度变化5℃可导致最大等效应力变化30%。通过试验测试发现现在气体火焰的加热方式温度飘移达5～30℃,而拉锥速度相对平稳。经过理论分析与试验研究推断,工艺参数中的火焰温度随机变化,导致耦合器性能的重复性差,附加损耗不稳定。

英文摘要：

Based on thermal viscoelastic theological theory and time-temperature equivalent principle, the thermal viscoelastic model of fiberglass under non-uniform temperature field is set up. By continuously adjusting its stiffness matrix and temperature field, the thermo-mechanical coupled numerical analysis of fiber coupler in the process of fused biconical taper is accomplished. The effect of technology parameters such as fused temperature and drawing speed on the manufacturing process is acquired. It is discovered that the maximum stress is in direct proportion to drawing speed, and fused temperature affects extremely on the manufacturing process. The change of fused temperature by 5 ℃ can lead to the change of maximum stress by 30%. It is found by experiment that the flame temperature change by 5-30 ℃, while the drawing speed is rather stable. A conclusion can be drawn by theory analysis and experimental research that it is the shift of fused temperature that induces the defaults of bad performance repeatability and unstable excess loss.