【正文】 方向，來自不同ONU的各種業(yè)務(wù)信息由無源光合路器互不干擾地耦合進(jìn)同一根光纖，并傳遞到局端OLT，相當(dāng)于點到點結(jié)構(gòu)。最大分路比已經(jīng)提高至1：128，最大傳輸距離為60km。3 蓮花灣小區(qū)FTTH接入工程設(shè)計 蓮花灣小區(qū)情況及設(shè)計概述蓮花灣小區(qū)位于大連市勝利路，一共12棟樓。數(shù)據(jù)業(yè)務(wù)采用PPPoE撥號方式通過BRAS接入大連市IP網(wǎng)，語音業(yè)務(wù)通過MSTP方式接入到NGN網(wǎng)。因為本小區(qū)與所屬分局距離少于60公里，因此將OLT安裝到局端符合GPON最大傳輸距離的標(biāo)準(zhǔn)。但有少量用戶家需要用到尾纖。4 蓮花灣小區(qū)FTTH接入工程實施 光纜的選擇與安裝蝶形引入光纜在入戶前一般有戶外架空式、管道式、樓內(nèi)明管式、樓內(nèi)暗管式幾種敷設(shè)方案。然后再將蝶形光纜引入孔內(nèi)入戶。熔錐技術(shù)是把兩根或多跟光纖束一起放置在拉錐機上熔融拉伸，并實時監(jiān)測分光比變化，分光比符合要求時結(jié)束熔融拉伸，其中一端需要保留一根光纖作為輸入端，另一端作為多路輸出端。再經(jīng)過1：64的分光器分光后光功率在18dbm左右，經(jīng)過1：16的分光器后光功率在12dbm左右，均能夠滿足ONU的理論接收光功率24dbm的要求。用戶通過聯(lián)通營業(yè)廳辦理寬帶、話音、IPTV業(yè)務(wù)的使用權(quán)限，后臺處理后下發(fā)工單。邏輯ID注冊完成后，使用電話機向外撥號，若能撥通則查看號碼與用戶開通的號碼是否一致。為保證觀看的流暢性，IPTV與寬帶分別使用兩條帶寬，IPTV擁有一條單獨的10M帶寬，與寬帶互不影響。輸入正確的帳號和密碼后測試。若不正常則重啟ONT，并致電機房檢查數(shù)據(jù)。中興機頂盒錯誤1403相當(dāng)于PC電腦XP系統(tǒng)寬帶撥號錯誤691，錯誤1404相當(dāng)于678。結(jié) 論 本次設(shè)計以FTTH的發(fā)展現(xiàn)狀和知識為基礎(chǔ)，把各種寬帶的優(yōu)缺點進(jìn)行對比，深入研究GPON技術(shù)的工作原理和特點，結(jié)合蓮花灣小區(qū)對聯(lián)通光纖數(shù)據(jù)業(yè)務(wù)的需求和目標(biāo)設(shè)計并實施具體的工程項目。接著我要感謝蓮花灣小區(qū)物業(yè)，給了我的設(shè)計一個高度評價，并在工程實施的過程中給予很大的幫助。s most enthusiastic on the FTTH,the fastestgrowing Ministry of Internal Affairs,including fiber to the home of a variety of broadband access network. Leader in the development of FTTH in Japan,in addition to governmentled operators to respond positively to the reason,there are networking and technical Internet users in general a short loop,while in the feeder part of the original there is a lot of dark fiber,which provides the convenience for the implementation of the technical side,the Japanese developed their own PON standards,without waiting for the FSAN standard of because of Japan39。s five cities in the status quo and impact of Internet usage survey report,users often use online services to read news,search engines,,the bandwidth required for these services is small,and the highbandwidth services such as video conferencing,VOD,multimedia entertainment use of the low ,in ADSL can already satisfy the current bandwidth usage of the market environment,highbandwidth services,demanddriven and popularization of the situation will take time. In the broadband industry,content providers,network operators,endusers to build an application service products value the operating level,is under a large number of software developers,device manufacturers,system integrators,and and their associated government,finance,media,marketing,consulting and services to build a plete industrial the various links on the joint industry chain,to build abroadband industry ecosystemrequires time and effort. FTTH operators do not actively into the development of another constraint FTTH should be constructed on the question of who can not be just who should be built by the construction party itself or by an operator is selected by a building operator or by the government to decide,in the FTTH,before the widespread these problems to be ,at this stage to promote FTTH development is still at an experimental stage,yet the actual businessoriented,and in the promotion process,FTTH broadband access technology as a form of xDSL in the domestic market,strong petition,with the xDSL petitive internal resource allocation at a relatively disadvantageous position,affecting investment in FTTH operators,not only sporadic testing program,and more from the big cities of the resident operatorled,the lack of Japanese carriers like prehensive resource integration and promotion,resulting in demonstration project of a multivendor or from the optical munication over other telemunications service providers,operators,pared with a passive role,in the absence of the strong support of operators,the domestic FTTH promotion efforts has not been strong. Technology and cost bottlenecks First,from a technical level,at present widely used ADSL technology to provide broadband services have certain advantages,as pared with the FTTH,the price cheap,the use of the existing copper wire network to make the construction simple,the current 500kbit/s~1mbit/s Video program can still meet demand,is the promotion of FTTH is currently a major petitor. From a global perspective,in broadband users,66%of users using xDSL,in China,this ratio is as high as 90%.Broadband access as an ideal way of FTTH,has not been largescale development of the most important reason is that the cost of optical access is still relatively devices due to the constraints of high cost and other factors,FTTH difficult to spread,we are only in the backbone network using optical fiber transmission,while in thelast mileaccess level of adoption of Ethernet and other access Jian Shuisheng Academy said,the development of lowcost optoelectronic devices to achieve the important task of fiber to the home. In Japan,FTTH and ADSL over the price to be petitive,the burden of Japan39。s current telemunications licensing system,FTTH to provide users with prehensive business Access will be very difficult,which undoubtedly will seriously impede China39。introduce relevant encouraging policies to promote the building of fiber to the home。s FTTH industry,the main issues the following points. Foster the development of market demand and the formation of the industrial chain still need time FTTH In addition to providing highbandwidth,but more important is what the operators can provide specific services that allow users to demand higher bandwidth,making the existing broadband access technologies can not be met under the promotion of the user towards ,according to this year39。參考文獻(xiàn) [1]劉增基等．光纖通信[M]．西安電子科技大學(xué)出版，2008. [2]林達(dá)權(quán)．光纖通信[M]．高等教育出版社，2005. [3]李國瑞，顧畹儀．光纖通信系統(tǒng)[M]．北京郵電大學(xué)出版社，2006. [4]馬麗華，李云霞，蒙文．光纖通信系統(tǒng)[M]．北京郵電大學(xué)出版社，2009. [5]中國通信學(xué)會組編．對話光通信[M]．人民郵電出版社 2010. 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