At the “2020 China Optical Network Symposium” held a few days ago, Wang Lei, technical director of China Mobile Research Institute, said that the implementation of the “double g and double promotion” work of the Ministry of industry and information technology has been accelerated, the network speed-up has been effective, and the fixed broadband has entered the era of Gigabit. China Mobile continues to promote the evolution and upgrading of optical broadband and mobile broadband networks, and build a digital economic network base.
If the dual Gigabit strategy promotes the optical broadband into the Gigabit era, the accelerated deployment of 10G PON supports the popularization of Gigabit. It is estimated that by 2022, the new deployment scale of 10G PON will exceed that of g / EPON for the first time. From 2019 to 2024, the compound annual growth rate of 10G PON OLT will reach 41%, and that of 10G PON ont will reach 124%.
Wang Lei introduced that at present, 10g PON has entered scale deployment, and China Mobile is paying attention to and laying out the next generation PON network to meet the needs of network evolution. Wang Lei introduced that the bandwidth of each generation of PON technology evolution line should not be less than 4-5 times; the scale deployment of temporary generation PON usually takes 5-7 years, and it is expected that the next generation of 50g PON will be launched after 2022.
China Mobile hopes to work with the industrial chain to promote the standardization of 50g PON and jointly lead the development of 50g PON technology and the formulation of standards. In terms of network requirements, it supports smooth evolution, coexists with 10g PON, takes into account low delay, meets 5g integrated small station return / real-time application, and is compatible with existing network ODN.
In order to be compatible with 10g PON and existing network stock ODN, 50g PON must overcome key technologies such as high speed and high power budget. For high-speed 50g optical signal, NRZ, pam4, EDB and other technologies are usually used, and NRZ modulation format has been determined. The scheme has high sensitivity, but there are still challenges for 32 DB power budget, such as poor high-speed signal quality and lack of broadband devices. For this reason, China Mobile adopts two solutions: one is based on SOA for receiving and sending, which can improve the performance of the receiver and transmitter, improve the transmission power and receiving sensitivity; the other is to introduce DSP technology to further improve the performance of the receiver through algorithm and coding and decoding.
Wang Lei said that in the next step, China Mobile will promote the next generation PON to support new features such as network slicing and low delay, so as to meet the requirements of unified access network capability under the fixed mobile convergence architecture.
Status editing: GT