频分多路光纤传输系统的设计考虑

本文详细讨论了频分多路模拟光纤传输系统中的调制方式、光源噪声及非线性特性、接收机前端等对系统性能的影响及设计考虑.     

用于光城域网的新型RPR技术

介绍IEEE802.17正在进行标准化的弹性分组环(RPR,Resilient Packet Ring)协议,分析其帧结构及主要功能特色,并和SDH与以太网等现有城域网技术作简要对比;可以预见,随着标准化工作的进行,综合多种传输技术优势的RPR会成为创建下一代高速光城域网的首选技术。     

Optical Transmission Modules for Intraoffice Transmission Networks

This paper considers the requirements of, and proposes technical solutions for, the optical transmission modules used in intraoffice links. A novel crosstalk noise measurement procedure is proposed along with a quantitative evaluation method for crosstalk prevention which is very important in the development of compact modules. A procedure for circuit adjustment elimination is also proposed, previously a great obstacle to attaining low manufacturing costs. Based upon the above, two types of modules are developed for DS2 and DS3 signal transmissions which meet the requirements of small size, low power consumption, and low cost without transmission performance degradation.     

光双二进制技术在城域光网络中的应用

对一种新型光部分响应数字传输技术即光双二进制技术的特点与发展趋势进行了深入研究和介绍。在详细阐述光双二进制系统的实现原理及主要实现方式,并介绍该技术的主要性能优越性以及近来研究成果的基础上,认为由于其与非归零等传统调制方式相比所具有的色散容忍度大、频谱窄、频带利用率高等诸多优点,使其在城域光纤网中的广泛应用正在日益成为可能。     

新一代城域光网络解决方案

本文分析了数据业务在新一代城域网中的重要性，说明了新一代城域网的要求，并重点阐述了爱立信公司的城域光网络解决方案。     

全波光纤及其在城市网中的应用前景

简要地回顾了单模光纤的主要传输性能 ,阐述了城市内的光纤网络与长途用的光纤网络对光纤的不同要求。介绍了朗讯科技最新开发的全波光纤 ,并讨论了在我国大中城市中全波光纤的应用前景。     

广电网络光缆传输系统的设计

在双向网络改造中,信号的传输主要是通过光缆来实现的。光缆质量的好坏、设计规范与否直接影响到信号质量。介绍传输系统中光缆的性能指标和光功率的计算。     

Considerations for Optical Receiver Design

The low dispersion and low attenuation properties of fibers between 1.3 μm and 1.6 μm make them more attractive for optical fiber transmission applications. In the absence of efficient avalanche photodiodes in this wavelength range, considerable research and development efforts on detectors as well as on the lownoise amplifier devices have been carried out. This paper reviews the present status of optical detectors and low-noise amplifier devices and discusses the low-noise amplifier design process by using a couple of examples at DS-1 and DS-4 bit rates.     

光城域网的关键联网技术和新型器件技术

文章分析了现行光城域网所面临的问题和挑战,在此基础上,重点探讨了新一代光城域网中的关键联网技术和新型光器件技术,同时预测了光城域网未来的发展趋势.     

光放大系统的传输损伤

光放大器的出现和发展是超高速ＳＤＨ传输系统和超大容量波分复用传系统得以迅速发展的主要技术推动力量,然而也之带来了一系列传输损伤,本文旨在针对与光放大器有关的各种传输损伤的分类,机制,传输限制和对策进行深入分析和探讨。     

长途高速骨干网光传输系统的优化设计

随着因特网中数据业务流量的日益膨胀．迫使运营商不断扩张长途高速骨干网光传输系统的数据传输容量。密集波分复用（DWDM）技术就是一种实现扩张带宽的灵活、快捷且成本低的手段,它可以利用现有的光纤基础设施将网络传输容量提高到原来的80甚至160倍。但是．DWDM系统是一个十分复杂的光传输系统．如何实现高效、低成本的光传送网络,以及如何优化设计网络结构和有效配置网络设备。就成为光网络研究的核心问题。     

城域光纤自动保护系统技术

城域光纤自动保护系统采用的是一种光纤的备份机制,对城域光纤通信进行自动、实时在线监测和管理,能对光缆线路障碍做出及时和有效的反应,将通信中断时间极大地缩短到1秒以内,从而对通信起到了有效的保护作用,提高了通信的可靠性和稳定性,有力地保证整个城域通信无间断地进行。     

High-Capacity Optical Transmission Systems

The 25 years since the founding of the Journal of Lightwave Technology have seen more than three orders of magnitude increase in the capacity of optical transmission systems. This dramatic increase was brought about by the deployment of WDM and advances in high-speed transmission technologies.     

High-Capacity PCM Transmission Systems for Toll Networks

High-capacity pulse code modulation (PCM) transmission systems have made little impact despite the availability of suitable technology and the rapid growth of low-capacity systems. It is shown that high-capacity systems can now be introduced into toll telephony networks without short-term economic or compatibility disadvantages and with considerable long-term advantages. A 120Mbits/s coaxial cable system compatible with 12-MHz systems is described in outline.     

长途高速骨干网光传输系统的优化设计

为了改善长途高速骨干网光传输系统的传输性能,对其系统器件进行了优化配置,主要包括提出一种新的光放大器的配置方案,在光传送单元（OTU）中引入FEC技术。以便实现在确保低成本的条件下实现高效、高质量传输要求的目的。     

MSR-下一代光城域网架构与解决方案

从下一代光城域网的理念出发,根据光城域网所要求的综合业务和智能化特性,重点阐述了MSR的基本概念、组网拓扑结构、MSR系统的组成与主要构件和MSR的通用帧格式;指出了MSR的市场定位并给出了组网和业务解决方案.     

A Modified Receiver for Optical Transmission Systems

A Percival coil connected between the photodetector and amplifier in the receiver of an optical communication system offers the possibility of improved signal-to-noise ratios (SNR's). When the photodetector is an avalanche diode, the modified receiver requires a lower value of avalanche gain for optimum performance.     

下一代城域网中的全光包交换技术

讨论了光包交换的结构、节点结构和网络结构以及实现包交换的关键技术，就全光包交换技术在下一代在域网中的应用作了论述。     

Design Considerations for Long-Haul Lightwave Systems

The following design considerations for long-haul lightwave systems are reviewed: outage and error rate requirements, terminal architecture, regenerator span design and performance specification, capacity upgrade alternatives, and broad-gauge economic factors.