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There is a long history that we talk about the user optical fiber system all over the world .especially the good characteristics for example bandwidth and the electromagnetism. There is no other transmission can be better than this. Therefore, optical fiber system will be the information-based in the future. However the system cost so much which late for the speed of dissemination. Meanwhile cablemodem; xDSL.this kind of broad band insert technologies are becoming mature and perfect, that will be the main force in the whole world. User optical fiber system just can be thought an ideal and the view, never will be become reality. But it was past. Great changes have taken place in Telecom and CATV all over the world. Countries they all break the corner, open their markets competition is becoming stronger and stronger, phone; CATV and high speed internet. Three of them consist together then the theory turn into fulfill, especially USA and Japan, network phone; network TV in this two countries are widely used, leading the current all over the world, especially the IPTV turns up and spread. Shocked by the entire IT industry. New technology enterprises stepped into this area because of the corner have been broken up. These companies consist the phone and CATV with internet technology, lower the cost, goods and service with lower price have been supplied to the society. Telecom and CATV have been crushed by this. Price war just like a raging fire. The market is smaller and smaller, traditional Telecom and CATV have to show their active and exoteric attitude, inprove theirs network in order to low the cost .competition make the technology in advance.XDSL we thought was great in the past problems come out when the market grow up. So new precept should be found again. Optical fiber is on the show. However the loss situation has been show in Japan because of the excess competition. That is one of the reasons that user optical fiber can be widely used in Japan.
.  Broadband access market present situation in Japan
The development of the user optical fiber that broad band enter into market in Japan we may pay more attention. Although Japan is later than USA on the user optical fiber development the broadband business is growing quickly. Competition is very fury. What’s more the government asks the telecom company open his ADSL to its opponent. Add more competition. Then Yahoo and some other company and enterprise enter into this competition range, they changed the kernel into IP, and lower its cost then they can take a big market with its lower price and supply the VOIP
Right now the VoIP phone fee between the members is free and inside or outside is 7.5/3mins lots of users attracted by this policy. Just like Japanese say this company have its clients about 2.828.000. As a result of the market competition and broadband business's development, urges the user optical fiber to develop is also quicker than the US, this period user optical fiber also obtains the fast development, according to the statistics, to the end of December, 2005, the FTTH number of users is 4,637,000 households, the NTT FTTH number of users is 2,820,000 households, announces the material according to the Japanese Ministry of Internal Affairs and Communications, to 2006 end, Japan's user optical fiber number of users reaches as high as 6,310,000 households in the second quarter, it already occupied in the wide band consumer market's share 23. 4%th, is only inferior to ADSL, is the Japanese second big user broadband access technology, causes Japan to become at one fell swoop the world the top-quality user optical fiber great nation; To 2007 end, FTTH develops in the first quarter to 8,800,000 households, the market share achieves the 33%, ADSL user is 14,010,000 households, the market share drops to 53%, by now the wide band user total amounted to 26,440,000 households; By the end of June, 2007, the Japanese optical fiber wide band's number of users has achieved 9,663,000, accounts for the wide band user total 36%, but the ADSL number is 13,786,000, the ADSL number of users accounts for the wide band user total the proportion also from original 53% to drop to 51%, henceforth obviously quick FTTH development!
  Starts in the first quarter from 2005, to 2006 the continual 6 quarters, the FTTH user increase has surpassed in the second quarter the ADSL increase, simultaneously to 2006 the second quarter, ADSL presented the negative growth.
 
Japanese user optical fiber fast development reason analysis
  The Japanese user optical fiber obtains a fast development substantial clause, is the policy impetus, as early as in 2001, the Japanese government proposed the e-Japan plan, urges the information industries development vigorously, Japan already had more than 50 companies to 2004 to provide the FTTH service to the society, in August the Japanese government also proposed in the same year the u-Japan plan, in 2006 January drew up the IT transformation strategy, this for the user optical fiber's development, has created the good environment. On the other hand, Japan is also uses the G-PON technology most early the country, because it and the IP technology endophilicity is good, is used as the basis very suitably by the IP technology the broadband business development, this is also another reason which the Japanese FTTH user develops fast.
  The G-PON technology conforms to ITU-TG..984 to suggest that is the milliard fold finishes the Internet technology, has the elastic technology, may manage the Ethernet, IP and the ATM current capacity, realizes the VoIP transmission or provides the independent simulation wave length. Because the Ethernet technology has the technology to be mature, the price is low, the extension good and easy to manage and so on characteristics, receives the telecommunication general reception. Its shortcoming is compares with the telecommunication another universal application technical B-PON technology, because uses the 8B/10B code, the band width use factor is not high, approximately some 20% band width loss. But the present broadband business basically is uses the IP technology, the G-PON technology and the B-PON technology compares, more suitable trade development request, therefore generally favors technology.
 
The FTTH market price's drop, is urges its fast development the principal factor
 
  Has amounted to 13,640,000 households by the end of 2003 Japan wide band user total, ADSL is 10,270,000 households, accounts for the total 75%, is the Japanese wide band user's main force; The CATV wide band user 2,470,000 households, the market share accounts for 18%, the FTTH 890,000 households, the market share accounts for 7%. But looked from the development speed that from at the end of 2002 to at the end of 2003, ADSL increased 4,620,000 households, the rate of rise has achieved 1.8 times, the CATV wide band user, increased 520,000 households, the rate of rise achieves 1.3 times, FTTH increased 690,000 households, the rate of rise has achieved 4.3 times. May see, FTTH grows swiftly and violently. Why will create this kind of situation? This policy which adopts with Japan related, it is well known, the FTTH biggest characteristic is may provide the bidirectional high speed stable correspondence, in the user optical fiber aspect, Japan provides the Gbit/s speed to the business user the service, provides the 100Mbit/s speed to the general family the service, and has nothing to do with the distance. Comparatively, xDSL can only provide the downward speed to the user to be highest for 40Mbit/s, upward serves high for 1Mbit/s, moreover also easy to receive on line's disturbance, enables the signaling quality not to be able to obtain the safeguard, simultaneously is ordinary the transmitting range to be very difficult to surpass 3 kilometers, the investigation material demonstrated that some 29% ADSL user wants to change to the optical fiber. On the other hand, Japanese NTT fees policy, also has urged the user optical fiber's fast development, east NTT the Japanese Corporation family user, at the beginning of 2004, the FTTH monthly rent was 4500 Japanese Yen, but the ADSL user, had household telephone's monthly rent is 2750 Japanese Yen, those who did not have the household telephone was 4950 Japanese Yen, might see does not bring household telephone's ADSL to be also more expensive than FTTH, to at the beginning of 2006, east NTT the Japanese Corporation its downward speed 47Mbit/s ADSL monthly rent was 3060 Japanese Yen, but this company's FTTH building inhabitants shared the G-PON technology the user optical fiber system, each household monthly rent was only 2500 Japanese Yen, simultaneously gave back to new user optical fiber many preferential benefits, like the installation expense half price and so on, Japan is honored as is in the world the cheapest user broadband access system.