外文翻译---宽带光纤接入网的发展趋势

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1、 Wide band optical fiber access network trend of development Author: Liu Jinhai article source: Computer universal time: 2005-3-8 This article first is brief introduced the world broadband access network develops the condition and the main application, next narrated the wide band optical fiber acces

2、s network merit. With emphasis has once more analyzed the wide band point-to-point active Ethernet optical fiber system and the wide band to the passive optical fiber system characteristic and the application. Meets down proposed our country optical fiber access network sends chem. possible to surmo

3、unt APON, BPON and the EPON stage, starts from the wide band point-to-point Ethernet optical fiber system and GEPON, finally and even transits to the GPON stage preliminary idea. Finally analyzed the optical fiber communications technology trend of development from each angle. The broadband access n

4、etwork develops condition and main application In fact, looking from the telecommunication development history, when the network number of users achieves certain scale. Each kind of application meets the nature production； this also is so-called steps the Cuff law might to be at especially. In the h

5、istory one kind of technology since birth has not been having a big pile of application, regardless of is the mobile communication or the Internet, on its short note, the browsing, the net chats and so on the key applications all is develops certain degree after the user scale to produce naturally,

6、but is not sedulously designs beforehand plans. Since has entered for the 21st century, the whole world broadband access network entered the big development phase. To 2004 years end, the total number of users already achieved 150,000,000, became in the electricity reliable historical account to deve

7、lop one of quickest telecommunication 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 5.5 years, but the broadband access service has only used for 3.5 years. According to the IDC forecast,

8、 in 2007 the global wide band total user may achieve 209,000,000, in which 9.9, namely about 20,000,000 users for optical fiber access network. The Asian and Pacific area, specially South Koreas and Japan were the broadband access develop the swiftest most and violent country, the South Korean wide

9、band user total already break through 10,000,000, the wide band popular rate occupied the world first, hold family 7 Internet 90%. Japanese Government also vigorously advances the wide band development through each measure, plans in 2005 to enhance the wide band user total to 30,000,000, in which FT

10、TH achieves 1 10,000.US still is the world biggest broadband access market, the total number of users surpasses 30,000,000.American FOC the wide band service localization is one of 2003-2008 year six big goals, in fact the broadband access is becoming the American universal service the next goal. Th

11、e US broadband access is primarily develops by the cable television and ADSL, because the telecommunication control policy encouragement uses the new technical construction network (e.g. FCC stipulation operation business construction optical fiber access network to be possible not limited the press

12、ure which in local ring circuit non-colligation policy) as well as the competition and the service grows, recently leads the operation business to be extremely positive to the optical fiber to the station (FTTP) development. Speaking of the optical fiber access network, specially the optical fiber t

13、o station (FTTP) or optical fiber proficient (FTTH), the whole world already started to enter the unloading phase, only US had 270 FTTP projects, was mostly the local authority, the public company, the property developer and the non-leading telecommunication operation business project. Leading opera

14、tion business also starts to enter this domain, in which Version plans in 2005 to complete 3,000,000 FTTP； SBC in the plan plans in 2007 in its huge “speed of light” to reach 18,000,000 FTTN, each household has speed 20-39Mb/s, provides the end-to-end tertiary service colligation (trite play) the se

15、rvice. Japan is in the world advances the FTTH most radical country, 2.004 years its optical fiber on already understood more than 18,000,000 households families, but the user development lag, probably was 2,000,000, in 2005 plans develops 10,000,000.Europe quite is steady conservatively, FTTH altog

16、ether has laid to 2004 500,000, some 167 small projects or the experimental project are carrying on. Our country broadband access network extremely is also rapid in the near two year development, according to the preliminary statistics, to 2004 years end our country wide band user is 25,000,000, bec

17、omes is inferior to USs second big broadband access market, in which leadership technology is only ADSL, probably accounts for about 70%, next is the Ethernet technology, but also has few wide band wireless turning on and electric cable modem turning on, also occupies regarding the FTTH technology t

18、he 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 Companys newest analysis, the initial period wide band application mainly is the high sp

19、eed surfer, may make the surfer the time to increase approximately 30%.Hereafter, along with the service large-scale development, develops the power which the new service becomes continues to develop. According to American BHK Corporation demonstrated in 2004 investigation result that, in 2003 the A

20、merican first five wide band expense was on the net gambles, the adult program, the game, music downloading and the selection and broadcast television, had obviously to the expense class incline tendency. Needs to point out that, discusses needs to pay attention to in a basic understanding using the

21、 actuation the erroneous zone, namely cannot place hopes in artificially studies beforehand develops 12 items so-called “the Assassins mace application”, promoted application. In fact, looking from the telecommunication development history, when the network number of users achieved certain scale, ea

22、ch kind of application meets the nature production； this also is so-called 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 communication or the Internet, on its short note, the

23、browsing, the net 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 network superiority Along with the optical fiber in the toll network, the metropolitan area

24、network and even the access network branch section massive applications, the logical trend of development will be continues to the access network 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, in

25、cluding the market demand, the competition need, the application stimulation, the technical progress, the cost drop and necessary will transport Augur system development and so on. Our country in 2008 will hold the Olympic Games and in 2010 holds world expo these two big events to a certain extent t

26、o be able to advance the wide band optical fiber access network 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 t

27、echnology, 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

28、 source hopefully has realized, 850nm VCSEL only several US dollars, 1310nm VOSEL had the breakthrough, the speed reaches 10Gb/s.The 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

29、low cost passive component, work the technology, the automatic light operation test system and so on also all is affects the light access network promotion application the key aspect, needs to have the properly solution. The point-to-point active Ethernet Because system the cost, the quality, the ma

30、nagement, the security and so on many kinds of factors, the Ethernet still had further to improve as the public network turning on way. The traditional Ethernet belongs to the user in network (cPN).However its application actually in to include the access network other public network domain expansio

31、n. In the history, regarding business user application environment, the Ethernet technology always is the most popular method, at present has become only definitely in the power supply receptacle second big housing and the office public facility connection. Uses the Ethernet is had the huge network

32、foundation and the long-term 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 Ethernet compatible, the performance price compared to good, the extendibility, easy to install the clear as well a

33、s redundant reliable and so on. Regarding the public network housing user application environment, the point-to-point active Ethernet system uses the active service focus point to substitute the passive point-multipoint system the passive component, enables the transmitting range to be possible to e

34、xpand to 1 20 kilometer far. The main merit is special-purpose turning on, the band width has the guarantee, each user may monopolize 100Mb/s and even 1dbs； Bureau end equipment simple cheap； The transmitting range is long, the service area is big； But the cost the linearity increases along with the

35、 number of users actual growth, does not need to plan, the investment risk is low, thus disperses the local cost in the low density user to be low. The shortcoming is the both sides equipment and the optical fiber facility special-purpose, the user cannot share the bureau end equipment and the optical fiber, when the demand fast growth also the user are very crowded, optical fiber and both sides equipment quantity and cost as well as spatial demand also along with it rapid