共查询到15条相似文献,搜索用时 78 毫秒
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在以太无源光网络(EPON)系统中,光线路终端(OLT)和光网络单元(ONU)之间的最长光纤传输距离为20 km,但在一些较偏远地方,有些镇站距中心机房的距离往往大于20 km,提出一种延长EPON系统传输距离的方法,它在OLT上行采用光纤收发器,实现了大于20 km的EPON传输。 相似文献
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近几年,宽带接入技术突飞猛进,特别是光纤接入技术(FTTX)采用光纤作为传输介质,具有传输量大、传输质量高、高可靠性、传输距离长等优点。目前EPON是FTTX的主流实现方式,能够通过单一光网络平台实现数据、语音和视频业务。 相似文献
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王小宁王平陈峥 《光纤与电缆及其应用技术》2012,(6):30-32
EPON接入是一种应用于光网络的新型的宽带接入技术。分析了EPON技术以其传输速率高、损耗低、兼容性强等优势应用于海底观测通信网络中的可行性,利用OptiSystem仿真软件搭建了EPON光传输链路的仿真模型,并对1.25Gb/s上下行信号的传输性能及Q因子、误码率、眼图等参数进行分析,进而验证了EPON系统较高的传输性能。 相似文献
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At present, the maximal transmission distance between the optical line terminal (OLT) and opticalnetwork unit (ONU) of an Ethemet passive optical network (EPON) system is 20 km.However, this distance should be extended to 50 km or even longer in some applications such as fiber to the village (FTTV).A method for extending the transmission distance of an EPON system is proposed in this paper, in which the optical power amplifier and the adjustment of dynamic bandwidth allocation (DBA) are the key technologies. 相似文献
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Nurul Asyikin Mohd Radzi Norashidah Md. Din Mohammed Hayder Al-Mansoori Sajaa Kh. Sadon Mohd Shahmi Abdul Majid 《Photonic Network Communications》2014,27(1):1-7
Ethernet Passive Optical Network (EPON) has emerged as a promising technology since it offers high bandwidth at a distance that can go up to 20 km. In the upstream EPON transmission, a dynamic bandwidth allocation (DBA) algorithm is needed to avoid collisions and to efficiently allocate the bandwidth. This paper proposes an algorithm called as a Universal DBA (UDBA) algorithm that can support the priority universally in the entire EPON system. A peripheral interface controller (PIC)-based EPON testbed is used to test the algorithm within the mulipoint control protocol environment. For the performance study, we have compared the results achieved using UDBA in terms of delay, throughput, and fairness with two other DBA algorithms. UDBA shows improvements in terms of expedited forwarding, assured forwarding and best effort delay as much as 43.9, 42.6, 20 % over User-oriented Hierarchical Bandwidth Scheduling with Single Cycle (UHSA-S) and 37.5, 20.2, 25.3 % over Modified Smallest Available Report First (MSARF), respectively. Throughput is improved as high as 17.9 % over UHSA-S and 12.8 % over MSARF. In addition, the fairness index of UDBA is higher up to 14 % as compared to UHSA-S and 2.7 % as compared to MSARF. 相似文献
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《Selected Areas in Communications, IEEE Journal on》2005,23(8):1467-1478
Ethernet passive optical networks (EPONs) have emerged as the one of the most promising candidates for next-generation access networks. These new architectures couple low-cost optics with advanced edge electronics to offer vastly improved scalability over competing digital subscriber line and cable modem offerings. This paper proposes several novel architectural enhancements for EPON, which will help increase the viability of optical access over a broader range of subscriber access scenarios. Specifically, this paper proposes a two-stage EPON architecture that allows more end-users to share an optical line terminal link, and enables longer access reach/distances (beyond the usual 25 km distance). In addition, a new dynamic bandwidth allocation (DBA) algorithm is proposed to effectively allocate bandwidths between end users. This DBA algorithm can support differentiated services in a network with heterogeneous traffic. We conduct detailed simulation experiments to study the performance and validate the effectiveness of the proposed architecture and algorithms. 相似文献
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随着三网融合的具体实施,用户对带宽的需求不断提升,10 G EPON作为下一代宽带接入技术备受关注。10 G EPON具备高带宽、大分光比、长距离的特点,满足"三网融合"后以视频业务为主的高带宽发展需求,满足FTTH、FTTB、FTTO、FTTN各种高带宽需求的应用场景,从10 G EPON的进展情况、10 G EPON的关键技术及其实际应用等几个方面进行了分析。 相似文献
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阐述了EPON技术中媒体接入控制MAC以及OLT和ONT之间的通信过程和技术规范,介绍前向纠错技术FEC在EPON中的应用实践,延长了EPON的传输距离和增加最大分路比,同时根据各地的用户及分布情况、投资收益分析比数据、网络生命周期成本等,合理选择双向网络改造技术方案。 相似文献