光缆选型测试中的拉伸和渗水问题及分析

首先指出了光缆选型测试中容易出现问题的两项指标，即拉伸附加衰减和渗水性能。然后分析了这两项指标出现不合格的原因，包括光纤余长不足、使用劣质原材料等，并提出了相应的解决方法。重点分析了光缆的余长控制以及原材料的选择对光缆质量的重要意义。     

非金属光缆中光纤余长的设计探讨

本文通过计算，比较皱纹钢带铠装光缆与非金属光缆中光纤的余长随温度的变化值，分析非金属光缆中光纤的初始余长的合理范围。     

层绞式光缆“异常”拉伸-应变曲线浅析

本文从影响光缆中光纤余长的主要材料、影响光缆应变的结构元件相互结合形式和影响拉伸窗口的结构元件尺寸的不稳定性入手,分析了导致层绞式光缆拉伸-应变曲线“异常”的原因.     

光缆中光纤的余长设计与控制

随着光缆的大量使用以及光缆芯数的增加,对光缆的经济性和可靠性提出了越来越高的要求,对光缆的光传输性能(特别是双窗口的损耗)提出了更高的要求。比如,在光缆合同文中提出了1550nm波长的损耗平均不超过0.2dB/km的特殊例子,这无疑给光缆的制造厂家提出十分严格的要求。要想保证光缆双窗口优良的传输性能,抗拉伸性能及稳定的温度特性,除了制造的材质好、设备稳定,更重要的是对各种不同结构的光缆设计出最佳光纤余长,并在制造的各道工序中进行有效的精确控制。本文着重讨论余长设计与控制。     

对几种结构光缆拉伸应变性能的分析

本文简要叙述了光缆拉伸应变的一些特点及缆中光纤余长４的计算方法。对钢丝及钢丝绳进行了拉伸验证试验。着重对七种不同结构的光缆的应变性能进行了比较和讨论。通过这些讨论，介绍了从拉伸应变角度来分析光缆结构优劣的方法。     

光缆中光纤的余长设计与控制

要想保证光缆双窗口优良的传输性能，抗拉伸性能及稳定性的温度特性，除了制造的材质好、设备稳定，要重要是对各种不同结构的光缆设计最佳光纤余长，并在制造的各道工序中进行有效的精确控制。     

光缆应变测量

本文从理论上对光缆受力应变的情况进行了分析，对应变测量的实验装置，光缆样品作了简要介绍。实验结果表明，在光缆受到拉伸时，缆中光纤首先没有受到拉伸，只有在缆的应变超过余长值后，光纤才开始有应变。缆的应变和拉力的大小有线性关系。光缆样品在受到长期拉力时，光纤中的光功率变化和应变几乎为零，光缆样品受到短期拉力时，光纤中的光功率的变化最大为０．０２３ｄＢ，光纤的应变最大为０．０１２％。     

钢带纵包束管式光缆的拉伸特性

本文介绍钢带纵包束管式光缆的拉伸试验，并给出了试验结果。同时，对光缆的伸长特性、衰减特性、拉力值的确定及光纤余长等进行了分析讨论。     

电力特种光缆OPGW的设计要点

从OPGW光缆的结构特点入手，分析了确保光单元传输性能的主要因素光纤余长的产生机理及温度对光纤余长的影响，重点阐述了地线单元电气性能的主要参数允许短路电流的详细计算过程，并提出了OPGW光缆的发展方向和开发前景。     

超大余长光纤松套管设计与试制

对于某些特殊场合使用的光缆,需要松套管中光纤有非常大的余长,以满足光缆的抗拉伸等特性。文章就松套管内光纤超大余长进行设计,并通过样品试制验证。     

海底光缆余长测试新方法可行性分析

光纤余长是海底光缆的重要性能指标,目前针对光纤余长的分析主要采用解析法,尚没有进一步精确分析光纤余长分布的实验方法。文章提出两种精确分析管内光纤余长分布的实验方法:高能射线法和光纤光栅法,并从理论上分析了这两种方法的可行性。     

基于BOTDA的电力特种光缆应力应变研究

为解决光缆机械特性监测盲区,防止因机械性能劣化而产生的故障隐患,对光缆中光纤余长理论和BOTDA(布里渊光时域分析仪)、OTDR(光时域反射仪)监测原理进行研究。采用BOTDA监测技术,对光缆中光纤的应变进行了监测实验。结合理论分析,得出光纤应变随光缆的应力应变及机械特性变化的关系,能够对光缆机械性能劣化起到预警作用,防患于未然。     

Structural design for nonmetallic optical fiber cables made of high-modulus and low linear-expansion coefficient polymer tubes

This paper describes a design method for a simple structure nonmetallic optical fiber cable, consisting of stranded loose tubes which are made from a high Young's modulus and low linear-expansion coefficient new polymer. First, the Young's modulus and stranding pitch of the tube unit to effectively bear all laying tension have become obvious from mechanical investigation. The allowable region between the pitch and optical fiber excess length also became obvious. In the allowable region, no additional loss due to tube characteristics was observed in the wide range ofpm 60degC. Moreover, it is shown that good performance of the cable using the new polymers is not attained using conventional cable materials.     

不锈钢束管光纤余长的控制

不锈钢束管是OPGW和海底光缆等特种光缆的关键部件,而光纤余长则是不锈钢束管的一个重要指标.为提高最终产品的成品率和不锈钢束管的生产效率,分析了不锈钢束管光纤余长的产生原理,讨论了各种影响光纤余长的因素,包括光纤张力、油膏温度、油膏填充度、光纤芯数、钢管张力等,并对如何控制光纤余长提出了一些具体解决方法.     

全介质自承系列光缆（ADSS）

产品介绍Product introduction： 全介质自承式架空光缆 产品性能特点Product Prooertv： 光纤传输损耗小、色散低。合理的设计及精确的控制松套管中光纤的余长及成缆方式,使光缆具有优良的机械性能和环境性能。光缆结构紧凑,采用SZ层绞结构,保证光缆在恶劣的环境下,光纤不受到应力。加强件外和缆芯内充满阻水油膏。缆芯外纵包阻水带确保了缆芯全截面阻水效果。芳纶纱以恒定张力绕包于缆芯上并于PE外护套紧密粘结,     

光缆耐鼠咬能力评估方法研究

通过测量护套材料碎屑颗粒的体积,计算用于评估非金属材料耐鼠咬能力的标准化耐鼠咬指数,并介绍了根据鼠啃咬力大小的研究结果,采用合金材料制作的代表其平均啃咬能力的仿真鼠牙。使用仿真鼠牙,对常用的复合金属带进行了穿刺试验,以评估光缆耐鼠咬能力。     

Optical Fiber Submarine Cable System Development at KDD

An optical fiber submarine cable system using longwavelength and single-mode optical fiber is expected to provide economical long-haul digital transmission. This paper describes the recent research and development on an optical fiber submarine cable system for international communication at the KDD Research and Development Laboratories. An experimental model including cable and repeaters has been designed and manufactured. An experimental repeater of 1.3 μm and 280 Mbits/s was laid at a depth of 1500 m and its fundamental performance was measured in November 1981. Test production of longlength cable having a single continuous length of 30 km became possible in the end of 1981. In early June 1982, the experimental system with a 50 km cable length and two repeaters operating at 300 Mbits/s and 1.3 μm wavelength was laid in a loop into the Sagami Bay from the KDD Ninomiya Submarine Cable Landing Station.     

综合布线系统（二）：第二讲 综合布线系统的网络结构,布线部件和指标参数

概述了综合布线系统的网络结构和主要布线部件等基本内容;较全面地介绍了综合布线系统的信道和链路;说明了各段缆线的最大长度;系统列出了对绞线和对绞电缆布线链路和光缆布线链路的性能指标和主要参数。     

Design and performance of nonmetallic waterproof optical fibercable using water-absorbent polymer

A nonmetallic optical fiber cable waterproofed with absorbent polymer was developed. Methods are proposed for evaluating the reliability of absorbent polymer in order to apply it as a waterproofing material, and a type of polyacrylic acid is selected. In addition, a waterproofing design is established based on a theoretical estimate of the water penetration length in the cable space. Among other findings, it was shown that the optical fiber loss of water-penetrated cable increases due to freezing. The allowable penetration length of waterproof cables can be determined so as to suppress this loss increase. Cables manufactured using this new design and absorbent polymer showed performance sufficient for practical application     

Design and characteristics of multi-hundred-core optical-fiber cable for use in subscriber feeder lines

This paper describes a design method for optical-fiber cable consisting of optical-fiber ribbons encased in loose tubes. The influence of excess fiber length on optical loss in a loose tube is evaluated and the required clearance is obtained. The optimum combination of the clearance and the tube stranding pitch is obtained in order to suppress fiber strain. The tube dimensions are also discussed and are determined to protect fiber ribbons from lateral load. A 600-fiber-structure cable is manufactured according to the obtained design results; the transmission and mechanical performances are confirmed to be excellent.