In the promotion process of triple play, FTTH network deployment and the development of broadband optical fiber access technology have always been the focus of attention.my country's FTTH network has covered more than 10 million users, but the actual users are about 1 million.It is predicted that by 2015, my country's FTTH network ports will exceed 100 million, and the actual users will reach 40 million.For FTTH, we need to pay attention to PON technology and other aspects.The first stage: From 2001 to 2002, IEEE and FSAN/ITU-T put forward the technical concepts of EPON and GPON respectively, and PON technology entered the Gbit/s era.Since Japan first began to deploy EPON technology in 2004, EPON technology and GPON technology and the industry chain have matured and been deployed on a large scale. These two technologies will become mainstream applications in the market in the next three years.The second stage: After the PON technology of 1G rate gradually matures, IEEE and FSAN/ITU-T have started the research on 10G PON since 2008, which means that PON technology will enter the era of 10Gbit/s.IEEE still continued the original technical route, adopted Ethernet technology, and launched the 10G EPON standard through a small amount of expansion. It was officially released in September 2009. ITU-T started the standard formulation of 10G GPON later, and basically continued GPON. , and formed a series of standards in mid-2010, and completed the standardization of XGPON1 with downlink 10Gb/s and uplink 2.5Gb/s.This marks that the two major technical schools of the next-generation PON technology, 10G EPON and 10G GPON, have been basically completed at the standardization level.At present, 10G PON technology is committed to the process of industrialization and commercialization.Driven by the upgrade of bandwidth demand and market competition, and considering factors such as industry maturity and cost, it is expected that 10G PON technology will enter the commercial stage as soon as 2012, and 10G EPON technology will be the first to start commercial use.The third stage: what technology should be adopted in the post-10G PON era, there is still no clear direction. IEEE, which has been researching PON technology ahead of time, has no relevant plans. Although FSAN has discussed this aspect, there is no substantive conclusion. FSAN currently For NGPON2, it should meet "the total downstream bandwidth is not less than 40G, and the total upstream bandwidth is not less than 10G (the maximum exclusive bandwidth of each terminal user should not be less than 1G); the maximum transmission distance is not less than 40km, and the distance The difference is not less than 40km; the branch ratio is not less than 1:64; the clear requirement of reusing the ODN of the GPON/XGPON1 network.Interestingly, ITU-T has terminated the standardization of XGPON2 with 10Gb/s downlink and 10Gb/s uplink, which means that there are many technical and cost obstacles in the development of 10Gb/s optical modules in burst mode. PON with WDM/TDM technology is a possible technical direction of NGPON2, and the wavelength allocation scheme of WDM PON has been discussed in ITU-T.In terms of standardization, 10G PON continues the development route of XPON: IEEE has formulated the 10G EPON technical specification (802.3av) on the basis of the EPON standard and is developing the 10G EPON Interoperability Specification (SIEPON); 10G GPON technical specification (G.987.x) and 10G GPON ONU management and maintenance specification (G.988).Among them, business interoperability is a key issue in realizing the sharing of the global industrial chain.In November 2009, IEEE specially set up the SIEPON working group to formulate the 10G EPON global interoperability standard, hoping to completely solve the problem that once restricted the development of EPON in the world.Combined with the existing EPON enterprise standards of operators such as China Telecom and NTT as a blueprint, SIEPON hopes to be able to quickly apply the standard in 2012.Of course, the drafting of regional business interoperability specifications and related testing and verification work are in full swing.The situation of 10G GPON is different from that of 10G EPON. From the perspective of business interoperability, 10G GPON is relatively complete in terms of global standardization. However, due to the incomplete industry chain, there are few equipment that can provide 10G GPON in the market, and the test and verification of business interoperability The work has not yet started.From the current actual test situation, the entire industry chain of 10G EPON is gradually maturing.In terms of chips, the core chips on the ONU side have been ASICized. Broadcom and Opulan have both launched second-generation chips, while there are currently fewer ASIC chip manufacturers on the OLT side, and the technology is not mature enough. It is estimated that by the end of 2011 or 2012 *The ASIC chip on the OLT side will gradually mature in the quarter.In terms of optical modules, the upstream and downstream 1G/10G asymmetric optical modules have also been introduced to the market, but they are expensive due to less demand.In terms of equipment, mainstream companies such as Huawei, ZTE, Fiberhome, and Alang are deeply involved in the research and development of 10G EPON equipment. Compared with GEPON, 10G EPON terminal (ONU) equipment has fewer forms and functions need to be further improved.10G GPON: With the attention of European, American and Chinese operators, Verizon, FT, TI, Telefonica, PT, China Mobile, China Unicom and other companies have organized the thorough testing of 10G GPON technology, including Erisson, AL, MOTO, Huawei Mainstream equipment manufacturers, etc. are involved.From the test situation, compared with 10G EPON, the 10G GPON industry chain is about 8 to 12 months behind, the system equipment is still in the laboratory prototype state, the core chip is implemented by FPGA, and the 10G/2.5G optical module technology It is immature, and the yield of optical modules that meet the index requirements is low.Therefore, in general, the 10G GPON industry chain is far from mature.Constrained by business requirements and costs, 10G PON will be the first to be applied in FTTB scenarios.The introduction of the domestic triple play policy will intensify the competition in the broadband access market, and speed up the construction and upgrading of operators' optical fiber access networks. 100Mb/s broadband access to the home will become possible. China's population is dense, and the construction of FTTB The mode has become the mainstream. In this construction mode, users can reach 256 or even 512 per OLT port, while the bandwidth of xPON is only 1G/2.5G, and the average EPON per user is only 8M (considering 50% concurrent online rate ), GPON is only 20M, and there is a big gap from the ultra-bandwidth requirement of more than 50M, so it is more urgent to adopt 10G PON technology.At the same time, the cost problem is not prominent in the FTTB mode. The optical module and MAC chip in the MDU only account for 20% of the cost, and are also shared by a dozen or dozens of users, so the cost increase is very limited.Therefore, within 3 years of the initial application of 10G PON, FTTB is the most suitable application scenario.Of course, under the influence of the triple play policy, domestic operators will also adjust their strategies in the near future and start to actively promote the deployment of FTTH/O. Whether 10G PON can become the mainstream technology choice for FTTH depends on the factors of technology and equipment maturity. It will also depend on cost factors: the cost of 10G PON needs to drop rapidly, especially the cost of 10G PON ONU should be close to the cost of GEPON/GPON ONU in the short term. several times that of GPON.At present, GEPON/GPON is used to deploy FTTH. Under the condition of 50% convergence ratio and 1:32 split ratio, the average bandwidth per user of GEPON/GPON can exceed 50M/100M, and the comprehensive cost of each line has dropped to the market. acceptable level.Copyright © 2005-2022 51CTO.COM Beijing ICP Certificate 060544 All rights reserved. Please do not reprint without permission