China Mobile and ZTE complete single-carrier 400G pilot tests in existing network

China Mobile and ZTE complete single-carrier 400G pilot tests in existing network

PRESS RELEASE: ZTE Corporation in partnership with the Guangdong branch of China Mobile, took the lead in completing the single-carrier 400G pilot tests of various scenarios in the existing network, including OXC point-to-point, OXC pass-through, FOADM and OLP protection tests.

In the tests, ZTE achieved ultra-high-speed long-distance transmission on the provincial backbone network with a total length of 683 km, based on G.652.D optical fibers. This fully verifies that the single carrier 400G was commercially ready, and laid a foundation for the deployment of 400G on the provincial backbone networks of China Mobile.

With the implementation of China’s “east-data-west-computing” project, computing power has become the hot topic of the industry. Currently, router ports in IDC equipment rooms are being upgraded to 400GE while data centers in Guangdong province are being moved to tier-2 and tier-3 cities and the networks are flattening. Basic networks focus more on service experience than network performance, and place higher requirements on bandwidth, latency and transmission distance of transport networks.

Therefore, in application scenarios of the existing network, how to build an OXC optical network based on single carrier 400G has become the network evolution goal of China Mobile. The all-optical network aims to dynamically perceive the service traffic, flow demands and changes in the computing power network, and to guarantee computing and network synergy, timely response and end-to-end services, thereby speeding up service transfer without the reduce distance.

ZTE supplied the ZXONE 19700 electrical cross-connect subracks based on the 32-degree OXC system with a single-slot bandwidth of up to 1T at the nodes between Guangzhou and Zhanjiang in the provincial backbone network of Guangdong Mobile. Using the 400G PS-16QAM modulation, ZTE completed the pilot tests in practical application scenarios such as provincial backbone OXC, FOADM and OLP, based on G.652.D optical fibers with a total length of 683 km. The test items include the impact of OXC on system performance compared to FOADM, OLP insertion loss, and the impact of OXC optical throughput on system performance, and the comparison between the transmission performance of 400G and 200G. ZTE passed all the tests in just 13 days. The test results show that the Guangzhou-Zhanjiang system of China Mobile can implement service provision without regeneration based on single carrier 400G.

During the multi-level OXC pass-through in the existing network, the system OSNR has not obviously degraded and therefore meets the service transmission requirements. At the same time, the 400G system can work stably at both the FOADM and OXC optical layers, and has the OLP (Optical Line Protection) and APO (Automatic Power Optimization) functions. Therefore, the 400G system is ready for commercial use.

In the future, China Mobile and ZTE will continue the transmission performance tests of 400G QPSK in various application scenarios in the existing network to provide more choices for long-distance transmission of 400G on backbone networks.

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