【正文】 ice longterm development needs. 3. EPON/GEPON Along with IP rising with the development, some people proposed the EPON concept, namely in with APON and the BPON similar structure and in the foundation, tries to retain its essence part physics level PON。 Bureau end equipment simple cheap。s second big broadband access market, in which leadership technology is only ADSL, probably accounts for about 70%, next is the Ether technology, but also has few wide band wireless turning on and electric cable modem turning on, also occupies regarding the FTTH technology the track stage, the minority developed city already was also starting to consider and to experiment each kind of FTTHI technology. Looking from the wide band application that, according to the American Mai Kenxi Company39。s end, the total number of users already achieved 150,000,000, became in the electricity reliable historical account to develop one of quickest telemunication services, and even was also quicker than the mobile service. For example the whole world mobile service from 10,000,000 developed to 100,000,000 has spent for years, but the broadband access service has only used for years. According to the IDC forecast, in 2020 the global wide band total user may achieve 209,000,000, in which , namely about 20,000,000 users for optical fiber access work. The Asian and Pacific area, specially South Korea39。 this also is socalled steps the Cuff law might to be at especially. In the history one kind of technology since birth has not been having a big pile of application, regardless of is the mobile munication or the Inter, on its short note, the browsing, the chats and so on the key applications all is develops certain degree after the user scale to produce naturally, but is not sedulously designs beforehand plans. Since has entered for the 21st century, the whole world broadband access work entered the big development phase. To 2020 year39。s end our country wide band user is 25,000,000, bees is inferior to US39。 this also is socalled steps the Cuff law might to be at especially. In the history one kind of technology since birth has not been having a big pile of application, regardless of is the mobile munication or the Inter, on its short note, the browsing, the chats and so on the key applications all is develops certain degree after the user scale to produce naturally, but is not sedulously designs beforehand plans. Wide band optical fiber access work superiority Along with the optical fiber in the toll work, the metropolitan area work and even the access work branch section massive applications, the logical trend of development will be continues to the access work to match the line segment and to direct the inlet part to extend, the key is advances the speed quickly? This will be decided by many kinds of factors, including the market demand, the petition need, the application stimulation, the technical progress, the cost drop and necessary will transport Augur system development and so on. Our country in 2020 will hold the Olympic Games and in 2020 holds world expo these two big events to a certain extent to be able to advance the wide band optical fiber access work the development Below mainly will analyze several kind of main wide band optical fiber turning on technology from the system technology angle the characteristic, the question and the trend of development. Certainly, besides the system technology, affects its application the factor to be very many, mainly is the service and the application as well as the control policy. In addition, each kind of necessary primary device technology and the placing installment test technology extremely is also essential. At present the low cost photo source hopefully has realized, 850nm VCSEL only several US dollars, 1310nm VOSEL had the breakthrough, the speed reaches 10Gb/ PLC mix integration technology, the high density low cost optical cable and the correlation technology, uses the optical fiber to the curving insensitive room in, the low cost passive ponent, work the technology, the automatic light operation test system and so on also all is affects the light access work promotion application the key aspect, needs to have the properly solution. The pointtopoint active Ether Because system the cost, the quality, the management, the security and so on many kinds of factors, the Ether still had further to improve as the public work turning on way. The traditional Ether belongs to the user in work (cPN).However its application actually in to include the access work other public work domain expansion. In the history, regarding business user application environment, the Ether technology always is the most popular method, at present has bee only definitely in the power supply receptacle second big housing and the office public facility connection. Uses the Ether is had the huge work foundation and the longterm experience knowledge, at present all popular operating system and the application as the business user turning on method primary cause also all is with the Ether patible, the performance price pared to good, the extendibility, easy to install the clear as well as redundant reliable and so on. Regarding the public work housing user application environment, the pointtopoint active Ether system uses the active service focus point to substitute the passive pointmultipoint system the passive ponent, enables the transmitting range to be possible to expand to 1 20 kilometer far. The main merit is specialpurpose turning on, the band width has the guarantee, each user may monopolize 100Mb/s and even 1dbs。s cost is very high. Moreover, its tree branch topology caused the user not to have the protection function or the protection function cost is high, has affected the largescale development. 2. APON AND BPON The early narrow