高强度氟化物玻璃光纤的研制

STUDIES ON THE MECHANIC STRENGTH OF FLUORIDE GLASS FIBER

以高纯无水的氟化物为芯玻璃原料,聚全氟乙丙烯塑料(TEFLON-FEP)为皮层,采用新的方法制备了ZrF_4-BaF_2-LaF_3-AlF_3-NaF(ZBLAN)氟化物玻璃光纤预制棒,并拉制出光纤,研究了工艺条件对光纤抗弯曲强度和光纤损耗的影响。研究结果表明,该方法对消除氟化物玻璃光纤中的微晶、气泡等缺陷,改进光纤表面及芯皮层界面状况是非常有效的,可明显地提高氟化物玻璃光纤的抗弯曲强度,降低光纤损耗,所制得的氟化物光纤的抗弯曲强度大于1100 MPa,光纤损耗低于0.25dB/m,该光纤已应用于某短程传输系统中。

Using dehydrous high purity fluorides as raw materials and adopting new preparation techniques,the glass preforms and fibers, with core of ZBLAN fluoride glass and cladding of TEFLON-FEP,have been prepared. The influences of preparing process and conditions on both bending strength and loss of fiber have been discussed. The results indicate that, by using this simple method, bubbles and microcrystals in preform and fiber can be effectively controlled and the interface between core and cladding of fiber can evidently be improved. So the mechanical strength can be enhanced and the transmission loss can be decreased. Fluoride glass fiber with the bending strength higher than 1100 MPa,and loss lower than 0. 25 dB/m has been prepared successfully. It has been used in some transmission system of short length.