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CITIC Networks and Huawei Pioneer Commercial Use of Single-Wavelength 600G Networks

Feb 22, 2019

[Beijing, China, February 22, 2019] Huawei and CITIC Networks Co., Ltd. (CITIC Networks) have successfully made commercial use of a single-wavelength 600G network in Beijing for the first time in the industry. The network performance demonstrates that the high-speed transmission shown to be theoretically viable in laboratory testing has been fully realized on the live network. The high-speed transmission, made possible by overcoming the traditional limitations of physical channels, achieves best performance in the industry. 

China's Internet services have flourished in recent years, thanks in large part to a user base numbering in hundreds of millions. At the same time, more and more of users are producing rich video content, which requires substantial storage space. The cloudification trend has seen video information move into data centers; this has caused CITIC Networks's traffic to grow rapidly, reducing the duration of capacity expansion periods and causing capacity bottlenecks on optical fiber networks to be reached more quickly. Improving single-wavelength bandwidth, therefore, became an efficient solution to broaden transmission capacity.

The main bottleneck of 600G is the transmission distance achieved. In lab tests, the results for 600G were close to the Shannon limit; however, system performance is always lower on a live network due to the limitations of physical channels. In working with CITIC Networks to pioneer 600G commercialization, Huawei brought three core technological advantages to the table in an effort to maximize the transmission distance even on the live network: unique and proprietary algorithm chips, Channel-Matched Shaping (CMS), and optical-layer AI neuron technology.

Huawei Chips Provide Powerful Foundation for 600G Commercialization

In the process of developing successive generations of proprietary oDSP chips, Huawei has accumulated numerous powerful algorithms, a technological advantage which has helped Huawei maintain market leadership in the fields of 100G, 200G, and 400G ultra-high-speed optical transmission. Now, Huawei's 600G solution underlying the sixth-generation oDSP chips introduces series of powerful algorithms — advanced nonlinear compensation, high-precision adaptive component damage compensation, and crosstalk elimination — that improve encoding efficiency and help achieve 64QAM modulation.

CMS Improves Transmission Distance

Huawei's unique CMS technology detects the transmission effect on physical channels, obtains channel impairment model information and physical transmission link status, and optimizes transmission performance through shaping, compression, compensation, and error correction, thereby maximizing the transmission capacity and distance in physical environments. The results are industry-leading transmission performance. reduced per-bit transmission cost, saved number of relay sites, and reduced CAPEX for customers.

Optical-layer AI Neuron Modules Optimize Network-wide Performance and Improve Reliability

Embedded AI neuron modules quickly mark all optical-layer parameters on the network in real time, implementing independent optimization, active protection, and early warning capabilities on optical networks while improving 600G network performance and reliability.

A CITIC Networks representative said, "CITIC Networks is currently focused on developing ultra-broadband intelligent and reliable networks, driven by the move toward cloudification and the demand for innovations in efficiency. Our collaboration with Huawei has been instrumental in our development, allowing us to successfully achieve 600G rollout without reconstructing existing optical lines and equipment rooms on the live network, and in a way that lets us fully utilize advanced technologies such as single-wavelength 600G to build highly efficient DCI networks."

Zhou Xiao, President of Huawei Enterprise Transmission Network Product Line, said, "The challenge of network traffic is ripe ground for technological innovation. Huawei has always been committed to long-term strategic investment and rigorous innovation in the field of high-speed optical transmission, and has built and maintained core competitiveness in the field of cloud-centric networks, as well as optimize network-wide performance with our industry-leading sixth-generation coherent oDSP chips, CMS algorithms, and optical-layer AI neuron modules, maximizing spectral efficiency and making future optical networks more intelligent. Our joint innovation with CITIC Networks provides a successful model for Huawei to draw on as we promote network cloudification and digital transformation together with our industry partners."