蓝宝石光纤高温光学特性研究

Study on Optical Properties of Sapphire Fiber under High Temperature

实验研究了蓝宝石光纤在高温环境下(大于1000℃)的光学稳定性,以及光纤的自辐射、塑性弯曲对出射光信号的影响,结果表明蓝宝石光纤在高温下的光学传输损耗随时间增加,温度测量精度由信号的稳定性和光纤自辐射决定,而蓝宝石光纤的塑性弯曲引起的信号额外损耗比较小,在900nm处小于0.1dB。光纤表面在高温下的永久损伤是产生这些性能劣变的主要原因,损伤的主要机制为外部杂质在高温下与光纤表面的相互作用。

The performance stability, self-radiation and plastically bend of sapphire fiber under high temperature are studied. Experimental results show the optical transmitter loss increases with time when sapphire fiber under high temperature environment. Temperature measurement precision depends on the stability of signal and the self-radiation of fiber. The additional loss caused by a single plastically bend is less than 0.1 dB at 900 nm, less than the loss before bend. The permanent injury of the sapphire fiber surface is the main reason for deterioration. It is found that the surface injury is mainly attributed to the pollution of the fiber surface and the mutual reaction between the sapphire fiber and the polluted substance in the ambient environment.