【作者】 李文；

【导师】 迟学芬； 任立新；

【作者基本信息】 吉林大学 ， 电子与通信工程， 2014， 硕士

【摘要】 我国农村地区地广人稀，村屯大小错落不一，各运营商基于其成本考虑往往是将原有宽带资源进行改造，把ADSL改成一体机形式，或改造成FTTB形式，最后仍以金属线或无线作为用户末端传输媒质。PON技术从APON技术、BPON到目前最成熟的E/GPON技术发展已经过了数十年的时间，多年来EPON网络接入的发展过程就是将光纤不断地向用户延伸、最终实现光纤到户的过程，即FTTH。在2011年，中国电信辽宁分公司决定把FTTH发展到农村地区，然而但多年来FTTH的网络建设停留在城市区域，农村FTTH建设经验不多，在实际发展过程中发现农村和城市的小区区别很大，问题也较多。城市的FTTH大多通过一、二级分光实现光纤入户，但这样使用EPON网络的先决条件是，小区集中、距离近、方便规划，而且小区内楼宇位置大同小异。但在地形复杂、形状各异的农村村屯，城市这套FTTH经验并不适用。村和村直接看似一山之隔，距离不远，但实际建设中却要绕过大山增加接入距离，因此农村需要远距离FTTH接入的村屯数量很多。而接入到远距离的村屯光缆接头往往较多，光衰过大超过了原来的光链路预算，目前解决光衰大办法较单一，通常是采用一味的降低分光比来提升光功率。对于超过20KM的村屯往往放弃FTTH接入。考虑到企业的市场需求，研究远距离村屯FTTH的接入方法势在必行。本文研究了EPON系统中MPCP协议，深入分析了互通实现过程，提出EPON网络远距离接入的方法和技术，从而，在不增加中继点的前提下，在现网覆盖到远距离村屯后，实现了稳定的FTTH接入服务；针对远距离村屯光衰过大不能实现接入的问题，研究了系统硬件，深入研究了通过FEC编码提升光链路预算的原理、技术，提出提高光链路预算增加网络稳定性的方法，最终实现稳定的FTTH接入服务。本文对扩大农村FTTH的接入距离增加网络运行稳定性进行了实践性的方法总结和研究。本文研究方法的实现也将提升企业在农村固网业务的优势，并为企业减少投资，提升效益。同时，本文的研究工作和成果也为基于EPON网络的远距离接入研究提供了技术参考。更多还原

【Abstract】 In our country sparsely-populated rural areas，villages strewn at random and comein many shapes and sizes，change the ADSL to all-in-one form，or converted into FTTBform，finally still using metal wire or wireless as transmission medium. After the pastdecade，PON technology gradually from APON technology，BPON development to themost sophisticated E/GPON technology. For many years the development of EPON fibernetwork access is to continue to extend to users，and ultimately the process of fiber tothe home，that is FTTH.In2011，Liaoning Branch of China Telecom decided FTTH development to ruralareas，but it FTTH network construction over the years to stay in urban areas，rural FTTHconstruction with little experience，but we found the difference between rural and urbandistrict is large，the problem is greater in the actual development process. City of FTTHmostly by one，the secondary spectral optical fiber door，but this is a prerequisite forusing EPON network，community focused，closer and convenient planning，building locationinside the village and the same. In the shapes of the complex terrain，rural countryside，city of the FTTH experience do not apply.Direct seemingly mountain village and village，distance is not far，but in actualconstruction increase access distance around the mountains， so many rural needlong-distance FTTH access quantity of rural and remote areas. And often more accessto remote countryside cable connectors，too much failure more than the original light linkbudget，the single solution to droop big very，usually adopt blindly ways to reduce thespectral ratios increase light power. The access to remote villages are often more cableconnector，the light fades too larger than the original optical link budget，the currentapproach to solving very large single lumen，current approaches to solve extremely greatlumen is single. Commonly used solution is reduced by blindly to enhance optical powersplitting ratio. For the villages often give up more than20km FTTH access. Consideringthe demand of the market，enterprise research distance country’s FTTH access methodis imperative. This paper studies the MPCP protocol in EPON system，in-depth analysis of thecommunication process，put forward the methods and techniques of EPON network remoteaccess，and thus，without any increase in the premise of relay points，the current networkcover long distance villages，achieve a stable access service about the FFTH. After Thecurrent network cover long distance villages，against problem that long-distance villagecan’t achieve access owing to the big luminous decay，research the hardware of the system,and study deeply about principles，techniques of FEC coding enhance optical link budget,improve method that the network complete steadily by improving the optical link budget，eventually achieve a stable FTTH access services. This paper summarizes the methodsand research practice to increase the stability of network to access distance to expand ruralFTTH. In this paper，the expanding rural FTTH access distance increasing network runningstability of the method for the practical summary and research. If the research of this papercan achieve，enterprise’s fixed-line business advantages will improve in the rural areas，and reduce investment and improve efficiency for the enterprise. At the same time，thisarticle research work and achievements are based on EPON network which providestechnical reference to the research on remote access.更多还原