GB/T 15972.31 - 2021 is the testing standard for the tensile strength of optical fibers. It details the selection and preparatory requirements of optical fiber samples to ensure that the samples can represent the characteristics of optical fiber products. Standardize the testing equipment, stipulate the accuracy and range of key instruments such as Tensile Testing Machine. Rigorously describe the tensile strength test process, covering key operations such as tensile speed and loading method. Through this standard, the tensile strength of optical fibers can be accurately measured, providing core data for optical fiber quality control and engineering application selection, and ensuring the stable operation of optical fiber communication systems.