Zhao Wenyu of China Academy of Information and Communications Technology: Optical transmission networks are showing a diversified development trend. News on October 14 (Yan Yi) Today, at the China Light Summit Forum and 2020 China Optical Communications Industry Development Conference held at the ICT China 2020 High-Level Forum at the same time as the China International Information and Communications Technology Exhibition, Zhao Wenyu, director of the Broadband Network Research Department of the Institute of Technology and Standards of the China Academy of Information and Communications Technology, discussed the development trend of high-speed optical transmission technology. He believed that new infrastructure has further accelerated the construction speed of infrastructure, and the overall optical transmission network has shown a diversified development trend. Zhao Wenyu said that the optical transport network mainly has four typical directions: first, high speed, large capacity, all-optical networking is still the core demand of the optical transport network; second, data centers, artificial intelligence, etc. promote the optical transport network to become open and intelligent; third, judging from the development of optical network equipment and optical modules, the trend of integration is becoming more and more obvious; fourth is the current content and standard situation of QKD. In terms of ultra-high-speed and large-capacity trends, 100Gb/s has been deployed since about 2011. Currently, the single-wavelength rate is evolving from 400Gb/s to 800G/1T+. Spectrum expansion has attracted industry attention to increase transmission capacity, and spatial division multiplexing has begun partial commercial use; optical switching technology based on ROADM has been widely used in operator networks. In terms of open and intelligent trends, the demand for optical interconnection in data centers is strong, promoting open and decoupled optical networks; agility, collaboration, openness, and intelligence have become new features of optical network management and control. The most typical one is the data center interconnection driver. At present, our main traffic driver is the traffic between data centers. The demand for peak equipment for data center interconnection includes traditional peak equipment and interconnection equipment. The application trend is that the proportion is gradually increasing. The introduction of artificial intelligence in optical networks further enhances the management and control capabilities of optical networks. The introduction of AI also solves the problems faced by the integration of artificial intelligence + transmission network itself, such as data collection and processing, algorithms and specific parameters. In terms of optical transmission integration trends, ultra-large-capacity optical is the infrastructure of an information network, and research on its capacity expansion and multiplexing is still advancing simultaneously. The current transmission network technology of optical networks currently coexists with photoelectricity, and the all-optical networking model is steadily advancing. Optical modules are currently continuing to evolve towards high speeds. Currently, 25G is the main speed platform, and higher speed 50G and 100G are also advancing accordingly. Photonic integration technologies such as silicon photonics are also currently accelerating development. Overall, small and medium-sized PICs have been applied. In terms of QKD standard trends, standardization is currently being further promoted, and the Internet has become the development direction that everyone is paying attention to in the future. In terms of standardization, the ITU has two working groups. There are quite a lot of standards related to SG13 and SG17. There are currently 18 related standards, 8 of which have been completed. In addition, the ITU has established a focus group on quantum information technology, and relevant research work is currently being carried out in an orderly manner. The international CCSA has also completed the submission of four standards for approval. From the perspective of future development, quantum Internet is the key direction for the future development of quantum communications based on quantum technology distribution and quantum state transmission and quantum computer node interconnection