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对As-S芯皮(纤芯—包层)结构多模光纤的制备工艺进行了研究。通过设定芯料管和皮料管压力比、拉丝速度和拉丝温度等工艺参数,可获得不同直径以及芯径皮厚比的多模As-S芯皮结构红外光纤。当双坩埚尺寸固定,光纤芯径会随着芯料管和皮料管压力比的增大而增大,而皮厚则会减小;但当皮料管压力减小到一定程度并保持一定时,光纤芯径和皮厚受芯料管压力改变的影响就不明显了;一般拉丝速度越快,直径就越小。由于红外玻璃原料中杂质S—H的含量对As-S红外光纤损耗的影响比较显著,因此应着力提高原料纯度,降低As-S红外光纤损耗,以实现As-S红外光纤的国内产业化。
The preparation of As-S core-core (core-cladding) multimode fiber was studied. The multi-mode As-S core-sheath infrared fiber with different diameter and core-thickness ratio can be obtained by setting process parameters such as pressure ratio of core tube and skin tube, drawing speed and drawing temperature. When the size of the double crucible is fixed, the core diameter of the fiber increases with the increase of the pressure ratio between the core tube and the sheath tube while the sheath thickness decreases. However, when the pressure of the sheath tube is reduced to a certain level Timing, fiber core diameter and skin thickness by the core tube pressure change is not obvious; the faster the general drawing speed, the smaller the diameter. As the content of impurity S-H in infrared glass raw material has a significant impact on the loss of As-S infrared optical fiber, the purity of raw material should be increased and the loss of As-S infrared optical fiber should be reduced so as to realize the industrialization of As-S infrared optical fiber.