利用高低温设备实验研究大芯径光纤在-100～100℃温度范围内温度对大芯径光纤传输损耗的影响。实验结果表明，大芯径光纤在光纤传输第1窗口（850 nm波段）传输损耗系数随着温度随机波动，在整个温度区间内其传输损耗系数在2.543 dB/km~4.237 dB/km范围内波动；研究还发现，经过高低温循环实验测试后，光纤纤芯与包层处未产生顺磁性缺陷，说明在此温度范围内光纤化学键未发生断键情况。通过建立相应的应力模型解释了大芯径光纤在高低温两端传输损耗系数波动较大的原因，并提出了减少温度对大芯径光纤传输损耗影响的相应措施。

Using the high-low temperature equipment, we study the influence of temperature on the transmission loss of the large-core optical fiber in the range of -100 ℃ to 100 ℃ by experiment. The experimental results show that the transmission loss coefficient at the first window (850 nm waveband) of the large-core optical fiber fluctuates randomly with temperature. The transmission loss coefficient in the whole temperature range is in the range of 2.543 dB/km to 4.237 dB/km. The results aslo show that, after high-low temperature cycle, the paramagnetic defects are not found in the optical fiber core and the cladding layer, therefore, the chemical bands of the fiber are not broken. In addition, the corresponding stress model is established to explain why the transmission loss coefficient fluctuates too much at the ends of high-low temperature, and the corresponding measures to reduce the effect of the temperature on transmission loss are proposed.