当今光缆在建立各种类型通信线路,其中包括架空通通线路方面,得到了越来越广泛的应用。然而光纤可能发生少量相对伸长及其对应变的敏感性,会限制对敷设和使用光缆的机械条件提出高的要求,尤其对光缆的拉力和弯曲半径给以严格的限制。在把光缆用作架空通信线路时,要将其悬挂于金属索上以消除在两个支架间发生松坠现象,但在光缆引下段和进入建筑物处一般不使用外部强力元件。计算在上述地段光缆内发生的应力和应变,并采取措施消除这类现象是有价值的,这是因为发生应力和应变会使光缆的光学参数恶化,甚至使光缆丧 Today’s optical cable in the establishment of various types of communication lines, including overhead lines, has been more and more widely used. However, the small relative elongation and its sensitivity to strain may occur in the optical fiber, which will limit the high requirements on the mechanical conditions for laying and using the optical cable. In particular, the tension and bending radius of the optical cable are strictly limited. When using an optical cable as an overhead communication line, it should be hung on the metal cord so as to eliminate the phenomenon of loose falling between the two supports. However, external power elements are generally not used in the lead section of the optical fiber cable and into the building. It is valuable to calculate the stresses and strains that occur in the optical fiber cables in the above locations and to take measures to eliminate them. This is because the occurrence of stress and strain will worsen the optical parameters of the optical cables and may even cause the optical fiber cables