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Facing the direction of development in the era of all-optical networks, Zhang He in his report comprehensively elaborated on the industry's application of G.654 fiber projects to achieve large-scale deployment, and analyzed the prospects of space division multiplexing (SDM) technology.Zhang He pointed out that all-optical network is a solid base for the new generation of digital infrastructure and a key means to continuously improve bandwidth and capacity, and will continue to develop in the direction of broadband, intelligence, openness and ubiquity, becoming an important part of the "new infrastructure". With ultra-secure, ultra-low latency, ultra-reliable, ultra-large bandwidth, ultra-long distance and flexible and adjustable high-quality connections, the all-optical network can quickly and efficiently transport the "East" to the "West", fully releasing the super computing power of the "West". It can quickly and efficiently transport "East data" to "West computing", fully release the super computing power of "West computing", help "East data and West computing", and improve the level of cross-regional computing power scheduling. In the future, the main directions of optical network innovation include: new generation optical fiber, ultra-high-speed transmission, wavelength-level services, open optical network, intelligent optical network, and ubiquitous optical access.。In recent years, in order to test the advantageous performance of G.654.E fiber, China Unicom, together with industry players such as Changfei, Hengtong Optoelectronics, Zhongtian Technology, Fiberhome, Xigu OPTON, Fortis and Corning, has carried out two G.654.E active network engineering pilots, mainly in Hami-Baliqun, Xinjiang, where low temperatures can reach below -40°C in winter and high temperatures of over 60°C in the Gobi in summer. The two G.654.E network projects have fully demonstrated the feasibility and performance of this new type of fibre and have made significant progress.。“Cross-testing of a multi-vendor multi-fiber 400G system in the Jinan-Qingdao section of Shandong, verifying the long-haul transmission performance of G.654 fiber with G.652 fiberCompared to，At least 30% improvement in the distance of transmission without electric relays, reduction in the number of electric relay nodes equipment, and at least 30% reduction in the comprehensive cost (including lines and equipment)." Zhang He said。Zhang He introduced, it is taking into account the long-distance transmission performance and low comprehensive cost of G.654.E fiber, operators and Internet companies around the world are accelerating the deployment of G.654.E fiber, speeding up the commercialization of G.654.E fiber scale, building super 100G, 400G high-speed optical transmission network. In China, China Unicom, China Telecom and State Grid have all deployed G.654.E fiber optic cables on a commercial scale, while China Mobile has also built a G.654.E trial network. Overseas, overseas operators and Internet companies have also started to deploy G.654."In the context of accelerating the commercialisation of G.654.E and helping to upgrade and speed up all-optical networks, operators will take advantage of the opportunity to upgrade domestic fibre-optic cable networks to build G.654.E backbone fibre-optic cable networks to serve ultra-high speed, ultra-long distance and ultra-capacity system transmission." Zhang He said.In the report, Zhang He also discussed the application prospects of space division multiplexing (SDM) technology in communication networks. Although SDM technology is a potential technical means to improve the transmission capacity of optical fibres, at the present stage, it is still facing the problems of "complex structure design and preparation of SDM fibres", "SDM transmission FIFO/mode multiplexing demultiplexer", "MIMO DSP implementation under strong and weak coupling", "SDM transmission theoretical model and transmission regime", and "SDM transmission theory model and transmission regime". However, at this stage, we are still faced with many technical and engineering application problems, such as "MIMO DSP implementation under strong and weak coupling", "SDM transmission theory model and transmission system construction", etc."Optical networks have gradually entered the super 100G era, the next generation backbone network fiber, will not only serve 400G, but also Tbit/s and higher speed systems, taking into account the 15-20 year life cycle of fiber optic networks, with a larger effective area of G.654.E fiber for terrestrial transmission systems, can enhance the 400G system transmission performance. Extending the powerless relay distance, it has become the main fiber choice for 400G and future Tbit/s system applications, and the industry has reached a consensus. To cope with the rapid growth in bandwidth and break through the capacity crisis, space division multiplexing (SDM) and multi-band transmission (MBT) technologies are potential means to further enhance the capacity of optical fiber transmission, but there are still more theoretical, technical and engineering application issues that require the industry to work together." Zhang He concluded by pointing out.
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