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.     

Effect of cabling on polarization mode dispersion in optical fiber ribbon cables

This paper theoretically and experimentally investigates an effect of cabling on polarization mode dispersion (PMD) in ribbon fibers helically stranded in optical fiber ribbon cables aimed at designing low PMD ribbon cables. Based on the birefringence model focused on the change in the birefringence when ribbon fibers are cabled, the helical pitch of optical fiber ribbon cables is designed to minimize the maximum PMD in the cables. A low PMD characteristic is confirmed in optical fiber ribbon cable with approximately the optimal helical pitch.     

骨架式光纤带光缆用于FTTH的解决方案

将骨架式光纤带光缆用于FTTH的解决方案是将接人用的光纤带光缆中的光纤从机房连到若干交接箱,再接入各住宅单元,并根据住宅单元的不同结构选择所需接入的骨架式光纤带光缆.通过在骨架式光纤带光缆上开启若干分离窗口就可直接抽出需要接入住户的光纤带,而不必按通常的方式将光缆剪断,因无需接续且只需极少量的光缆,加上骨架式光纤带光缆无油膏填充的特点,极大地简化和方便了FTTH的设计和施工.     

Optical fiber cables for subscriber loops

The use of single-mode optical fiber cables in the local network is discussed. For various network structures, cable constructions with loose buffered fibers, ribbon, and V-groove elements are discussed. For star networks, cables with up to 2000 fibers are described. Cables for bus/star networks are also discussed. Splicing techniques and enclosures are considered. It is concluded that only mass splicing technologies with ribbons will lead to the required results     

Splice-loss estimation for an automated ribbon-fiber fusion splicer

Single-mode and multimode 2-24 optical fiber ribbon cables have been developed and installed in many countries in recent years. Meanwhile, several different types of mass fusion splicers have been produced and deployed in field for ribbon cable installation. However, a reliable method for local splice-loss evaluation remains a critical subject and an attractive topic to many scientists. A new concept for ribbon-fiber splice evaluation is developed and presented in this paper. With the concept, hot fiber images are taken during the fusion splicing. Core deformation observed from the hot images is combined with the cladding deform information from cold images to evaluate the splice loss. Reasonably good correlation between the calculated and measured splice losses are obtained in a large number of splice tests in our experiment. The Bellcore accuracy criteria for splice loss estimation are met by most of ribbon-fiber types     

Brillouin characterization of fiber strain in bent slot-typeoptical-fiber cables

A technique based on Brillouin gain spectroscopy is proposed to evaluate tensile and compressive strain variation in optical fibers. This technique is applied to characterize fiber strain in bent slot-type optical-fiber cables. Fiber ribbons containing four optical fibers each are stranded through the cable. When the cable is bent, two types of strain are created in the fiber. It was found from experimental results that the first strain, which was induced by the elongation and compression of the fiber ribbon along its length, was drastically reduced, while the second strain, which was created by bending the fiber ribbon in its plane surface, remained     

有线电视网络光纤资源管理

介绍了有线网络光纤资源管理方法,光缆接续表的标注和光缆接续图的绘制方法,将光缆网络路由图和设备分布情况与基础地图相叠加的方法,光纤资源管理系统实现方法及其在实际中的应用.     

光纤接续质量的控制

介绍了光缆施工维护中的技术标准与要求,以及如何提高光纤和光缆的接续质量及接续中应注意的问题,对正确、规范和高质量的光缆接续,延长光缆的使用寿命,减少光缆故障,确保通信畅通,将起到重要作用.     

光缆老化模型浅析

光缆在电力系统中承担着非常重要的作用,其老化状态直接影响电力系统的使用 安全和运行可靠性,因此对于光缆老化检测技术的研究逐渐受到了广泛的重视? 通过对光缆特性进行分析后,重点介绍了3种老化预测模型,寻找出光缆在不同 环境中的老化规律,从而有效对光缆剩余寿命进行预测?     

Optical Fiber Facilities for Subscriber Loops

This paper gives an overview of the introduction and subsequent development of optical fiber cable and its application to subscriber networks enabling economical broad-band services, such as video and high-speed digital data transmissions. This paper also outlines NTT's developments on subscriber optical fiber cable technology-in particular, the five-fiber ribbon cable structure, mass-fusion splicing machine, and multifiber connector-in its ongoing endeavors to establish economical and flexible subscriber optical fiber networks which provide optical fibers to each subscriber.     

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     

Optical coupling between coated fibers in a compact fiber ribbon

Optical coupling between coated optical fibers in a fiber ribbon for use in compact and high-density optical cable is described. By means of a measurement system having a sensitivity of -70 dB. optical coupling of -40 dB due to a small radius fiber bend is measured for an actual fiber ribbon coated with UV-curable resin. The optical coupling mechanism is discussed using analysis models of a coated optical fiber bend. Theoretical analyses and experimental results confirm that optical coupling occurs only when the refractive indices of coating materials satisfy the condition of radiating light traveling from a fiber core to a ribbon coat.     

Undersea fiber cable technology

Compared with the conventional coaxial undersea cable systems, an optical fiber undersea cable system has a great technical and economical advantage. It is also suitable for digital transmission. In this paper, the optical fiber undersea cable technology (including optical fiber cables and repeaters), which is now in the research and development stage in several countries, is reviewed.     

Identification system for optical fiber transmission operationlines with local-light injection and detection coupling system

An identification system using a local-light injection and detection coupling system is developed. The relation of bending fiber radius to both local-light injection and detection coupling efficiencies is shown. This system can be used for distances of up to 21 km at a bending radius R=7 mm. Also, the line number in the fiber ribbon, can be confirmed and transfer splicing loss can be estimated using this identification system     

Measurement of longitudinal strain in optical fiber cables during installation by cable ploughing

This paper reports a series of experiments in which a number of optical fiber cables were installed using cable ploughing equipment. The elongation of fibers in these cables was monitored during installation in order to assess whether excessive strain levels were encountered. The experiments confirmed that optical fiber cables can be satisfactorily installed using such techniques, and that residual strain levels were sufficiently low that the fiber lifetime was not prejudiced. It was found that optical fiber cables that are flexible and in which fibers are loosely housed can be installed with lower strain levels than other cables. A range of cable-ploughing equipment was used, and equipment which controlled the rate at which cable was fed from the cable drum was found to yield the best performance.     

带状光缆接续中的有关问题

讨论了带状光缆接续中的一些技术和操作上的问题，指出了一些应注意的事项。     

层绞式多芯光纤带的应变

主要研究层绞式带状光缆和边粘型大芯数光纤带。通过对光纤应变,光缆传输特性的分析和研究,结果表明,带状光缆特性受光纤带宽度和盘外径的影响。     

Basic Components and Fiber Optic Passive Components: Status and Trends in Japan

This paper reviews the status and trends of Japanese activities in fiber optic passive components. It covers the fiber manufacturing techniques (VAD method), several special fibers such as polarization-holding fibers, dispersion-shifted fibers, infrared fibers, metal coated fibers, and hydrogen-induced loss problems, as well as various kinds of fiber cables such as trunk communication cable, subscriber cable, submarine cable, and optical fiber composite overhead ground wire. The paper also discusses the problems of splicing, connecting, and coupling with respect to future trends and provides information on progress in Japan in the expanding field of communication technique.     

大容量中心束管式光纤带光缆的设计与制造

随着通信行业向着数字化、宽带化、智能化方向的发展,光纤网络的建设将由骨干网转向局域网与城域网,由于连接的节点较多,往往需要铺设大芯数的光纤光缆。中心束管式光纤带光缆因其集成度高、占用路由资源少、成本低等特点,将会得到广泛应用。本文就大容量中心束管式光纤带光缆的设计与制造进行探讨。     

光缆在线监测系统

近几年来光缆在电力系统的应用越来越普及，电力系统的通信、自动化、维护等越来越依赖高可靠、高性能的光纤传输。但在实际应用中，由于受外力及光缆本身质量等因素影响，光缆很容易遭到破坏，从而影响光缆的传输质量。光缆在线监测系统能在光缆遭到破坏时迅速确定光缆的故障点，为光缆故障修复提供宝贵的时间。