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EPON是一种新出现的光接入网技术,它是基于以太网的无源光网络,被认为是下一代接入网的最佳选择。它以光纤作为传输介质,主要传送以太网的数据帧,它采用无源分光器实现点到多点的连接。由于EPON全部采用无源器件因此其维护简单,成本降低。在本文中重点介绍了接入网的发展,EPON的体系结构、工作原理和EPON的关键技术。 相似文献
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以FTTB LAN模式下的多业务接入和FTTN DSL模式下接入点的选择为基础,着重介绍了EPON在陕西电信光进铜退改造工程中的应用,最后通过实例介绍了FTTx网络部署中局端设备和网管的规划。 相似文献
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突发发射模块是以太无源光网络系统中非常关键的一个器件,本文详细讨论了突发发射模块的要求、原理和设计技术,并给出了我们的实验结果. 相似文献
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结合IEEE 802.3 ah标准中的以太无源光网络(EPON)接收灵敏度指标,着重分析了接收灵敏度光调制幅度(OMA),该OMA指标的采用有利于系统降低对消光比的要求,使发射机和接收机的设计更加简单;最后,简要讨论了OMA和增强型接收灵敏度的测试,指出增强型测试更有实际意义。 相似文献
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EPON:下一代接入网的最佳选择 总被引:7,自引:0,他引:7
EPON技术具有大带宽、高性价比、结构简单和一定服务质量保证等特点,被业界普遍看好,成为下一代接入网的最佳候选技术。本文主要介绍了EPON的工作原理、分层结构、接入控制和组帧方式,最后给出了实现EPON的关键技术和难点以及EPON的发展近况。 相似文献
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EPON光收发模块的性能要求 总被引:4,自引:0,他引:4
文章针对EPON系统的各个技术特点,分别阐述了其对系统所用光收发模块的性能参数的要求,同时旬出了IEEE802.3ah对这些参数的建议,并对目前业内EPON光收发模块的研发现状和今后的发展方向做了一定的分析。 相似文献
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《Communications Magazine, IEEE》2001,39(5):134-139
Introducing quality of service features to the IP/TCP protocol suite has become a hot topic of research in both industry and academia. Several architectures have been proposed for QoS support at the network layer (layer 3 in the OSI model). Both integrated services and differentiated services architectures are examples of QoS models that are implementable at the IP layer. Another development at the IETF is the work related to traffic engineering using multiprotocol label switching. While traffic engineering covers a wide range of topics, QoS support is recognized as one of its necessary features. This article describes the QoS features of the constraint-route label distribution protocol and how they can be efficiently utilized to achieve service interworking between a number of different networking technologies 相似文献
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A passive optical network based on orthogonal frequency division multiplexing (OFDM-PON) gives improved performance for high speed optical access network due to its greater resistance to fiber dispersion and higher bandwidth efficiency. In optical fiber communication, chromatic dispersion (CD) is a linear distortion in fiber, but it is converted into nonlinear distortion due to square-law characteristic of photo diode detector at the receiver side resulting in degradation of performance. To compensate for this nonlinear distortion, we proposed to use a linearized receiver circuit with square root module (SRM) device which can improve the performance of system in terms of CD tolerance. In this paper, we have analytically analyzed the performance of OFDM-PON system with and without SRM device for direct-detection optical OFDM-PON (DDO-OFDM-PON) system. At BER of \(10^{-3}\), which is the limit of forward error correction, there is 11.1 and 13.5 dB improvement in optical budget with SRM for downstream and upstream direction, respectively, as compared to conventional DDO-OFDM-PON system. 相似文献
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Delavaux J.-M.P. Park Y.K. Yanushefski K.A. Chen C.D. Pleiss T.C. DiGiovanni D.J. Martin P. 《Electronics letters》1993,29(14):1248-1249
A novel and efficient balanced optical amplifier (BOA) configuration is proposed. In this technique the four ports of an erbium fibre multiplexer are used to combine signal and pump in a symmetric fashion, providing dual pumping while preventing pump crosstalk. The use of the BOA design in a 980 nm pumped erbium doped fibre power booster packaged module is demonstrated. Furthermore, tests of a +20 dBm output BOA as a power amplifier in a 5 Gbit/s transmission experiment result in successful bit error rate measurements through 86 km of nondispersion shifted fibre.<> 相似文献
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Venieris I.S. Angelopoulos J.D. Stassinopoulos G.I. 《Selected Areas in Communications, IEEE Journal on》1993,11(8):1160-1170
Connectionless (CL) services as already developed in LANs, have to interwork with emerging asynchronous transfer mode (ATM) connection-oriented (CO) networks. MANs are a significant evolutionary step and CO MANs, in particular, constitute a technically appealing method to integrate both environments and provide shared medium access for all services. The functions required for enhancing distributed-queue dual-bus (DQDB) MANs with CO services in a way compatible with ATM are described. Within the integrating framework of B-ISDN, the practically useful scenarios for interworking LANs, CO and CL MANs, and ATM are investigated and classified in order to exploit the advantages of an efficient protocol relay utilizing the resources of the lowest possible layer. This is aimed at assisting interworking unit (IWU) designers and implementors to decide on key options in this versatile and evolving environment. The CO DQDB case emerges as the most advantageous development in terms of interworking simplicity and robustness 相似文献