ABSTRACT

The telecommunication industry has expanded into multiple new applications. Developing fiber optic cables with reduced weight and diameter has been a new trend in cable industry. Smaller cables are generally easier to handle and afford lower bending diameters for confined spaces. One such scenario where cable diameter is of primary consideration is duct applications where duct space is leased to the user. It is important to these customers to secure fiber optic cables with small diameters in an effort to reduce installation and ongoing system costs. The features of this novel construction are very attractive to the customer. Lower cable bend diameters allow more flexibility in cable slack storage locations and longer continuous lengths help reduce the number of splice locations within a route. The cable diameters have been reduced by 8% to 24% depending on cable construction. Graphs showing cable diameter and weight reductions will be presented.
　　Key words: Telcordia GR-20, RUS PE-90, Reduced Diameter

引　言
　　减小了直径的光缆在很多应用场合都具有很强的吸引力，特别是在局部接入网，城域网和主干网的应用中。而且，采用现有路由的可能性也是要考虑的很重要的问题，此时，小直径的光缆就显得特别有吸引力。在这样的和其他一些应用场合中，光缆必须很结实，而且能满足户外使用的环境和机械性能要求。因此，对北美地区而言，这里介绍的光缆必须满足两个主要的设计要求：
　　直径和重量小
　　满足Telcordia GR-20规定的机械和环境性能要求
　　本文第二部分将介绍设计这种小直径松套管光缆时要考虑的参数和特性；第三部分将介绍这种光缆可采用的结构；这一部分还将列表比较这种光缆与传统设计的和商业上出售的松套管光缆在直径和重量上的差异；第四部分将展示按照Telcordia GR-20和RUS PE-90标准进行测试的数据，其完全符合北美地区接受的行业标准的要求；第五部分将介绍在加拿大进行现场安装实验的一些情况‘第六部分将讨论目前正在进行的工作；最后第七部分将给出结论。<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />