【正文】 ns 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。 The transmitting range is long, the service area is big。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 band passive light work is based on TDM, the performance price pared not well, already naturally withers away. An ATM passive light work (APON/BPON) may use ATM the centralism and the statistics multiplying, the rebination passive shunt to the optical fiber and the light line terminal sharing function, enable the performance price pared to have the important improvement, at present in countries and so on US and Japan already started mercial. However, the actual APON/BPON service adaptive provides at present very plex, provision of service ability is limited, the data transmission rate and the efficiency are not high, the cost is high, but its market prospect as a result of ATM decline dim. Finally, looking from the longterm service trend of development that, the APON available band width was still insufficient. Take FTTC as the example, although the typical branch downward speed may reach 622Mb/s, after but because the bypass, actual as separable greatly will reduce as each user39。 But replaces ATM by the Ether to take the link level agreement, constitutes one to be possible to provide a greater band width, the Low cost and wider professional ability new marriage EPON. This thought obtained the positive response in the Ether。 The downward service speed reaches as high as 1Gb/s, the permission support multiuser, each user39。 May use the Ether technology mature chip massively, the realization is simple, the cost low improved the electric circuit to refer to the coordination service nimbly provision with the reshuffle ability. IEEE the standard GEPON technology standards is good, on the downward wave length is 1310 and 1490nm, on the downward speed is , the transmitting range is 10/20km, the bypass pared to is 16, the primary service is the data and the sound of talking, after increases a 1550nm visual broadcast wave length, bees the sound of talking, the data and the television method of threeinone “tripleplay” the wide band service colligation service, but this will be the future family service “the Assassin39。 The transmitting range amounts to 20 kilometers at least, has the high speed highly effective transmission characteristic. Moreover, GPON has selected two seal methods, besid