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3.1 概述如在第二章中已经提到,高质量的光缆要能保持光纤的传输性能并保护光纤不致劣化.还要提供足够的机械强度以防止在敷设、安装或运行中可能受到的机械损伤.设计良好的光缆在有些情况中还可以减少光纤衰减随环境温度的变化.因此虽然光缆的性能在很大程度上取决于成缆以前光纤的性能,但是用作系统设计的应该是光缆中光纤的性能而不是成缆前光纤的性能,而光缆的机械性能决定着光缆路由的选择、敷设安装方法以及应用环境等,所以对于系统设计者,除了需要了解光缆制造长度的各种性能外,还要知道这些制造长度连接起来组成单元光缆段后的总性能.表3.1列出在制造长度上及单元光缆段上单模及多模光缆的各项性能.
3.1 General As already mentioned in Chapter 2, high-quality fiber optic cables are required to maintain the transmission properties of the fiber and to protect the fiber from deterioration and to provide sufficient mechanical strength to prevent possible mechanical damage during laying, installation or operation A well-designed fiber optic cable may in some cases also reduce the attenuation of the fiber with changes in ambient temperature.So although the performance of a fiber optic cable depends largely on the performance of the fiber before the cable is formed, the design of the fiber optic cable Rather than the performance of the fiber before cable, and the mechanical properties of fiber optic cable determines the choice of cable routing, installation methods and application environment, etc., so for system designers, in addition to the need to understand the cable length of the performance of various manufacturing, It is important to know the overall performance of these lengths of cable connected together to form the unit cable section Table 3.1 lists the performance of single-mode and multi-mode fiber cables over the manufacturing length and on the section of the unit cable.