Subscriber single-mode optical fiber ribbon cable technologiessuitable for midspan access

The loop network configuration and high-fiber-count, single-mode optical fiber ribbon cable and jointing technologies which enable a quick response to service demand and offer high reliability in the subscriber network are described. Fiber parameters were chosen for 1.3/1.55-μm wavelength division multiplexing (WDM) transmission, and a 1000-fiber cable composed of 8-fiber ribbons was developed. A mass-fusion splicing technique and a multifiber connector were developed for the fiber ribbon. These techniques were evaluated by constructing an experimental line. It was found that they are highly suitable for midspan access, which is indispensable for the high-fiber-count loop network     

SC-type single-mode optical fiber connectors

SC-type single-mode optical fiber connectors specifically developed for subscriber loop networks are discussed. The properties and design of precision zirconia ceramic ferrules which have been found to be ideal for high-performance, low-cost single-mode optical fiber connectors are described. A design approach featuring a plastic-molded rectangular connector housing using a push-pull coupling mechanism which has also been found to be suitable for durable, compact, and low-cost connectors is presented. SC connectors used with 10/125 single-mode fibers exhibit insertion loss of 0.06 dB and return loss of 38.6 dB, with no degradation during and after mechanical and environmental tests. To realize higher packaging density, duplex-ferrule connectors, quadruple-ferrule connectors and optical attenuators have also been developed on the basis of the SC connector design     

一种新的海底光缆监测系统的研究

建立海底光缆监测系统对保障已经成为当代洲际通信主要手段之一的海底光纤通信非常重要.文章提出了一种新的基于BOTDR和声纳的海底光缆事件监测系统,并讨论了其测量方法.     

单芯光缆连接器的自动装配和检验系统

本文描述了单芯光缆连接器的自动装配和检验系统的设计和组成部分 ,重点介绍了先进抛光技术和抛光表面的检验技术     

Return loss characteristics of optical fiber connectors

This paper describes the return loss characteristics for four typical contact type connectors: perpendicular and oblique endface connectors employing either physical contact or contact via index matching material. The high index layer on the polished fiber endface and the index matching material, which are important connector parameters, are investigated by measuring the return loss from one perpendicular fiber endface coated with the material and by etching the fiber endface. It is useful to apply two materials with different refractive indices to derive the refractive index and thickness of high index layers on perpendicular fiber endfaces. The index matching material we use has a refractive index of 1.467 at 20°C and a thermal coefficient of -2.9×10^-4/°C at 1.3 μm. We performed return loss calculations and experiments of the four contact type connectors. The worst value at any temperature from -40 to 80°C can be estimated, by measuring the return loss of these connectors at room temperature     

光缆线路自动监测相关问题的探讨

对光缆线路自动监测系统建设的必要性进行了分析，详细论述了提高光缆监测系统故障定位精度的几种方法，阐述了监测系统的建设方案，对含有EDFA线路放大器的密集波分复用系统的光缆线路的监测进行了分析。     

不中断法光缆割接

阐述了不中断法割接光缆的思路、操作时机以及人员安排、通信联络，并就实际运用的方法、步骤作了进一步探讨。     

核心网用层绞式光缆(1-3)

典型产品GYTA TlYpical product:GYTA 产品介绍:Product introduction: 金属加强构件、松套层绞填充式、铝-聚乙烯粘结护套通信用室外光缆Outdoor optical cables for communication purpose with metal-reinforced components,filling mode by loose tube layer stranded,and laminated aluminum polyolefin sheath.     

接入网用光缆带光缆——湖北凯乐科技股份有限公司

产品介绍Productintroduction：金属加强构件、光纤带松套层绞填充式、钢（铝）--聚乙烯粘结护套通信用室外光缆     

核心网用层绞式光缆

金属加强构件、松套层绞填充式、铝一聚乙烯粘结护套通信用室外光缆 Outdoor optical cables for communication purpose with metal-reinforced components, fillinq mode by loose tube laver stranded, and laminated aluminum polyolefin sheath     

Highly stable physical-contact optical fiber connectors withspherical convex ends

Highly stable physical-contact optical fiber connectors achieved by optimizing ferrule end structures are described. Ceramic ferrule material, the curvature radius of the ferrule endfaces, and the convex vertex eccentricity from the ferrule central axis were studied. On the basis of these studies, single-mode and multimode fiber connectors with stable low-insertion loss and high-return-loss characteristics were fabricated     

基于分布式光纤传感器的光缆监测系统改进方案

针对目前现存光网络监测系统在安全管理功能方面存在的不足,提出了一种应用分布式光纤传感器改进现有光缆监测系统的方案,并提出了此改进方案的基本流程图及其逻辑分层结构,完善了现有光网络监测系统的安全管理功能.     

Design and performance of ultra-high-density optical fiber cable with rollable optical fiber ribbons

This paper proposes a novel ultra-high-density optical fiber cable that employs rollable optical fiber ribbons. The cable has great advantages in terms of cable weight and diameter, and fiber splicing workability. Moreover, it will be easy to install in a small space in underground ducts and on residential and business premises. The structural design of the rollable optical fiber ribbon is evaluated theoretically and experimentally, and an optimum adhesion pitch P in the longitudinal direction is obtained. In addition, we examined the performance of ultra-high-density cables with a small diameter that employ rollable optical fiber ribbons and bending-loss insensitive optical fibers. The transmission, mechanical and mid-span access performance of these cables was confirmed to be excellent.     

Studies on designing of submarine optical fiber cable

This paper describes important studies necessary to design submarine optical fiber cables. These include a study for deciding the optimum single-mode fiber parameters to suppress losses during cabling, cable laying, and so on. It also includes a study on the necessary fiber proof test conditions to prevent fiber breakage during cable handling, that is, during cable laying and recovery and to assure long-term fiber reliability. Submarine optical fiber cable sea trial results are also stated for cables designed applying these studies.     

海底光缆结构与发展

简要介绍了海底光缆结构,对海底光缆一般技术要求及结构的发展趋势作了简单说明.     

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,     

海底光缆安全研究

海底光缆通信具有大容量、通信质量稳定可靠,隐蔽性好,抗毁、抗干扰能力强等特点,成为现代洲际通信的主力.从介绍海底光缆通信系统的组成入手,分析了影响海底光缆传输线路安全和光缆所传输信息安全的主要因素,提出了光缆质量与施工、故障定位与排除和加强信息传输安全等防护措施.     

浅谈光缆选型

光缆 ,重量轻、体积小、容量大、传输距离远、信号衰减小、抗电磁干扰 ,各种网络广泛采用。光缆结构复杂 ,品种繁多 ,有许多因素如用料、生产工艺、设备等影响到它的性能、质量及寿命。因此 ,在建网时 ,对光缆的结构、用料、工艺等 ,必须有深入的了解 ,以便选购合适的优质光缆。1　根据芯数选择不同型号的光缆光缆的结构可分为中心束管式、层绞式、骨架式和带状式等几种。层绞式光缆中心放置钢绞线或单根钢丝加强 ,用ＳＺ续合成缆 ,成缆纤数可达 14 4芯 ,它的最大优点是易于分叉 ,即部分光纤需分别使用时 ,不必将整个光缆开断 ,只要将分叉的…     

Optimum conditions for fusion splicing of optical fiber

A low-loss splicing method based on discharge fusion having average splice losses of 0.07 and 0.15 dB for single mode with core diameters of 10 and 7 µm, respectively, and 0.02 dB for 50-µm graded-index optical fibers are obtained. Mathematical expressions for the variation of fusion times and splice losses with effect of applied pressure between the fibers for different axis alignments showing optimum conditions are made. Theoretical curves agree with experimental results.     

光缆施工在OTDR光纤测试法中的应用探讨

作为以光纤为传输媒介的通信方式,其具有传输距离远、信息容量大、传输质量高等优势,因而在信息传输中的应用越来越广泛。光时域反射仪(Optical Time Domain Reflectometer,OTDR)在光纤测试中是非常重要的设备仪表,在光缆线路的维护、施工中的应用非常普遍。文章对OTDR技术原理进行了阐述,并对OTDR技术的精度保障进行分析,重点对光缆施工中OTDR光纤测试法的应用进行了详细探讨。