EPON:下一代宽带光接入网

介绍了EPON（以太网无源光网络）的体系结构，国内外的研究现状以及市场和应用，并对其前景进行了展望。     

光接入网的现状与发展

本文首先讨论了光接入网的基本概念和应用类型，然后对近期光接入网的发展进行评述，最后介绍ＳＤＨ和ＡＴＭ在接入网中的应用。     

光接入网技术发展掠影

从光接入网的概念出发，介绍了光接入网的接入、应用类型及传输技术等，并阐述其主要发展趋势。     

光接入网：第一讲 光接入网概述

本讲首先讨论了光接入网的基本概念和应用环境，然后介绍系统接入方式，接下来重点讲述系统参考配置和应用类型，最后分别简要介绍其业务支持能力和配置结构的选择。     

光纤接入网技术综述

本文从光纤接入网的基本构成，有源光纤接入网，无源光纤接入网，光纤接入网的拓扑结构、形式、优点与劣势等。详细地介绍了有关光纤接入网技术的各个方面。     

下一代光接入网EPON

现在，以太网无源光网络（EPON）技术已经走向市场，并被视为下一代接入网的最佳候选技术，它代表了低成本、高带宽以太网设备与低成本光纤网的融合。从推出EPSON技术的背景、基本要领、要解决的主要问题、标准进展情况和市场分析等方面对EPSON加以阐述。     

宽带光接入网技术研究

宽带光接入网（ＯＡＮ）是实现Ｂ－ＩＳＤＮ的重要基础之一。文中概述ＯＡＮ发展状况，着重对建立宽带ＯＡＮ所采用的几种主要技术及其特点进行了论述和分析。     

WDM-PON光接入网技术研究

介绍了WDM-PON系统的基本原理及技术优势,重点分析和探讨了其中所涉及到的关键技术,最后分析了WDM-PON的应用前景。     

OCDMA在光接入网中的应用方案

文章对光接入网（OAN）中光码分多址（OCDMA）方式进行了研究分析，并进行了计算机模拟，结果表明，在OAN中引入OCDMA技术，不需网络同步，在下行方向有很好的安全性，用户和业务可随机接入，可构成灵活的通用接入网传输平台。     

光接入网与光器件

阐述了接入网在电信网中的重要地位、光接入网的拓扑结构和无源光网络的关键技术，对光接入网所使用的光器件也作了全面的介绍。     

基于ATM的宽带无源光接入网的研究

以ＡＴＭ为基础的无源光网络（ＡＴＭ－ＰＯＮ）是未来实现宽带、多业务综合接入的重要技术手段。本文分析了ＡＴＭ－ＰＯＮ（ＡＰＯＮ）系统的基本结构和各个组成部分、所支持的业务、实现系统所需要解决关键技术及实现方法，同时对系统设计是所需考虑的一些重要问题进行了探讨。     

Flexible TDMA/WDMA passive optical network: Energy efficient next-generation optical access solution

Access networks must further advance to address the intensification of the requirements of growing speeds and the usage of Internet applications, and time and wavelength division multiple access (TDMA/WDMA) based passive optical networks (TWDM-PONs) have been widely considered as one of the evolutionary steps of next-generation optical access (NGOA) networks. TWDM-PON combines the flexibility of TDMA with an increased capacity offered by the use of a WDM layer. Moreover, it offers interesting and challenging avenues to minimize energy consumption: especially, with current access networks consuming about 80% of the energy consumed in the Internet. Along with other efforts, reducing energy consumption of central offices is conspicuous as it directly minimizes the operational expenditures of network providers. In this paper, we explore the new paradigms to conserve energy at the central offices in TWDM-PONs. By extensive simulations, we evaluate the possible energy savings in the various flavors of TWDM-PON. Based on the findings, we propose a new architectural flavor of TWDM-PON and benchmark the architecture for cost, power consumption and reach. We also propose a novel energy saving scheme for the proposed architecture and evaluate the impact of the proposed algorithm on energy savings by extensive simulations.     

Evolutionary architecture for an all-services ATM access network

This paper presents a flexible concept for a broadband subscriber access network which minimizes investment costs by predominantly using the existing network infrastructure. The target network may consist of either a coaxial tree-and-branch structure or symmetrical copper pairs to the subscriber, and is connected to the central head station with the aid of optical feeder lines which can be implemented or enhanced by a passive optical network (PON). In the event of an increase in bit rate requirements, the coaxial network can be expanded by dividing it into smaller, optically fed subnetworks or by supplementing it with optical overlay systems. Flexibility, expandability and low costs are achieved through the standard ATM format implemented for the signals of all interactive services down to the network termination units on the subscriber side. Those signals are transmitted in the coaxial network in frequency bands above the CATV band in accordance with a multiple of the CATV channel width to ensure that the modulation and demodulation is implemented in a cost-efficient manner while providing ‘bit rate on demand’ for a suitably high number of subscribers. Separation of the network termination unit from the customer premises equipment enables a flexible, cost-efficient subscriber configuration to be selected, existing domestic wiring to be used and several completely different subscriber terminals to be simultaneously connected.     

全业务网APON光纤接入传输系统

介绍在国家八六三计划资助下研制成功的全业务网接入传输系统 ,首先简述了系统构成、用户业务接口和传输帧结构 ,接着对 HFC双向光纤传输系统进行了简介 ,最后介绍了 ATM- PON系统和HFC系统的性能指标     

Optical broadband access using ATM on a passive optical network

Within the framework of the ‘FITL (fibre in the loop) evolution’, Siemens is developing a prototype based on a passive optical network (PON) for the economic provision of BISDN services in the subscriber access area. It provides 32 subscribers with BISDN access up to a maximum user data rate of 45 Mbit/s per subscriber. The information is transferred via ATM cells and PON-specific overhead in both directions on the PON at a data rate of 155.52 Mbit/s. For transmission to the subscribers, the time division multiplex procedure (TDM) is used. For transmission in the opposite direction, a highly flexible time division multiple access procedure (TDMA) controls the access to PON for the subscriber-side line terminations. In order to keep the transmission system inexpensive emphasis is placed on a digital calibration of the fibre loop delay, a burst transmitter at the subscriber side without amplitude recovery and a burst receiver at the exchange side with purely digital bit synchronization. However, to achieve these features a small part of data rate must be used as a PON specific overhead.     

PON与无线接入网协同发展关键技术研究

随着全业务的发展和中国移动“4+1网络协调发展”战略的提出,作为有线宽带接入主流技术的PON与无线接入网的结合更加紧密.本文结合中国移动WLAN、C-RAN和TD Femto无线接入需求,分析了PON与无线接入网协同发展的关键技术、发展策略和后续研究方向,主要包括PON支持WLAN回传、C-RAN传输和UniPON技术...     

千兆以太无源光网络关键技术研究

简要介绍了千兆以太无源光网络这种新型的接入网技术 ,主要对其中的关键技术进行了讨论 ,并提出了解决方案。     

光纤接入网规划探讨

随着全业务运营的全面开展以及光纤接入网在当前形势下所发挥的重要作用,提出了如何在光纤接入网规划过程中对目标用户密度区、OLT覆盖区、分光区以及接入光缆网进行规划的思路及方法.