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How large is the China Unicom optical cable

China Unicom's optical cable network spans tens of millions of core kilometers, supporting high-capacity 400G transmission and extensive domestic and international connectivity.

Network Capacity and Technology

China Unicom has been actively upgrading its optical network to support 400G transmission using advanced technologies such as single-wave 400G boards, PCS 16QAM modulation, and C+L band extended spectrum. In experimental networks, a single optical layer can support up to 96 waves, providing a system capacity of 38. 4 Tbps between major cities like Guangzhou, Shenzhen, and Dongguan, demonstrating ultra-large bandwidth and low-latency all-optical interconnection capabilities.

Optical Cable Procurement and Scale

In terms of physical infrastructure, China Unicom's centralized procurement projects indicate the massive scale of its optical cable deployment. In 2024, the company issued a tender for 65. 7859 million kilometers of optical cables, including ordinary, trunk, and butterfly optical cables, reflecting the extensive domestic network expansion.

Earlier projects, such as the 2017-2018 procurement, involved 58. 3 million core kilometers, highlighting consistent large-scale network growth.

Submarine and International Connectivity

China Unicom also operates major submarine optical cables, including the Asia-Europe 5 (SMW5) and Asia-Pacific Direct (APG) systems. These cables provide high-capacity international links with system design capacities exceeding 24 Tbps to 54 Tbps, connecting China to multiple countries across Asia, Africa, and Europe, and forming part of the "Maritime Silk Road" information highway.

Summary

Overall, China Unicom's optical cable network is extensive both domestically and internationally, with tens of millions of core kilometers of fiber, high-capacity 400G transmission capabilities, and advanced optical technologies. This infrastructure supports ultra-high-speed broadband, backbone connectivity, and global interconnection, making it one of the largest optical networks in the world.

How large is the China Unicom optical cable

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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