光纤余长是光缆设计和生产中的重要参数。光纤的余长设计及控制对光缆的性能指标影响非常大。光纤余长的大小直接影响到光纤的抗拉性能、温度性能、直径、重量、成本和工艺参数等许多方面。本文分别从套管余长中的螺线式余长分布和正弦余长分布两种典型的余长数学模型出发,分析和讨论了各自余长的产生机理以及余长数学描述,为设计和控制光纤余长提供了理论依据。 Optical fiber is a long fiber optic cable design and production of an important parameter. The long optical fiber design and control of the optical cable performance indicators have a great impact. The length of the optical fiber directly affects the tensile properties of the optical fiber, temperature performance, diameter, weight, cost and process parameters and many other aspects. Based on two typical extra length mathematical models of helical length distribution and sine length distribution of the remaining length of the casing, this paper analyzes and discusses the generation mechanism of each length and the mathematical description of the length of the extra length for the design and control Optical fiber length provides a theoretical basis.