本标准规定了单模光纤、硅基多模光纤、多组分多模光纤、塑料包层多模光纤的光纤或夹套光纤光学特性相关结构参数的测试方法，全塑料多模光纤和连接内光纤（以下统称为光纤）。

This Standard specifies the test methods for structural parameters related to the optical characteristics of optical fibers or jacketed optical fibers of single-mode optical fibers, silica-based multimode optical fibers, multi-component multimode optical fibers, plastic cladding multimode optical fibers, all plastic multimode optical fibers and intraconnection optical fibers (hereafter generically referred to as optical fibers).