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本文从理论上对光缆受力应变的情况进行了分析，对应变测量的实验装置，光缆样品作了简要介绍。实验结果表明，在光缆受到拉伸时，缆中光纤首先没有受到拉伸，只有在缆的应变超过余长值后，光纤才开始有应变。缆的应变和拉力的大小有线性关系。光缆样品在受到长期拉力时，光纤中的光功率变化和应变几乎为零，光缆样品受到短期拉力时，光纤中的光功率的变化最大为０．０２３ｄＢ，光纤的应变最大为０．０１２％。
In this paper, the stress strain of fiber optic cable is analyzed in theory. The experimental equipment for strain measurement and the fiber optic cable sample are briefly introduced. The experimental results show that when the optical fiber is stretched, the optical fiber in the cable is not stretched first, and the optical fiber begins to strain only after the strain of the cable exceeds the long value. Cable strain and pull the size of a linear relationship. When the cable samples are subjected to long-term tension, the optical power variation and strain in the optical fiber are almost zero. When the optical cable samples are subjected to short-term tensile stress, the optical power in the optical fiber changes by a maximum of 0.023 dB and the optical fiber has a maximum strain of 0.012%.