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为了解决预制棒直径的增加和拉丝速度的提高所带来的光纤内部应力增大的问题,提出利用退火炉改善光纤内部应力的方法,并且从理论上分析了应用退火工艺改善光纤内部应力的原理。通过对比实验,得到退火工艺对光纤衰减、翘曲特性和光纤脆性的影响。在退火工艺条件下,所制得的光纤在1 310、1 550nm波长的衰减典型值分别为0.317dB/km、0.182dB/km,翘曲度值在14m以上,光纤的剥纤断纤率降低到0.08%。
In order to solve the problem of increasing the internal stress of the optical fiber caused by the increase of the preform diameter and the increase of the drawing speed, a method of using the annealing furnace to improve the internal stress of the optical fiber is proposed, and the principle of applying the annealing process to improve the internal stress of the optical fiber is theoretically analyzed . Through contrast experiments, the effect of annealing process on the attenuation, warpage and fiber brittleness of the optical fiber is obtained. Under the condition of annealing process, the attenuation of the obtained optical fiber at the wavelength of 310 and 1, 550 nm is 0.317 dB / km and 0.182 dB / km respectively, the warpage value is over 14 m, To 0.08%.