China to South Korea optical fiber cable
China and South Korea are directly connected by major submarine optical fiber cables, including the Trans-Pacific Express (TPE) and the Asia-Pacific Gateway (APG), providing high-capacity, low-latency communication links.
Key Submarine Cable Systems
1. Trans-Pacific Express (TPE) The TPE is a major submarine cable system linking China, South Korea, Taiwan, Japan, and the United States. It was completed in 2008 and is a joint venture between China Telecom, China Netcom, China Unicom, Chunghwa Telecom, Korea Telecom, and Verizon Communications. The system spans approximately 17,700 km and initially handled 1.28 terabits per second (Tbit/s), with a design capacity of up to 5.12 Tbit/s. TPE provides a direct high-speed link between China and South Korea, bypassing intermediate hubs in Japan, and supports individual connections at 10 Gbit/s for customers . 2. Asia-Pacific Gateway (APG) The APG cable system is a 10,400 km network connecting China, South Korea, Taiwan, Japan, Hong Kong, Vietnam, Malaysia, and Singapore. It consists of six fiber pairs in the trunk and was initially designed with 128×40 Gbps DWDM technology, offering a system capacity of 30.72 Tbps, upgradable to 100 Gbps per wavelength. The APG consortium includes major telecom operators such as China Telecom, China Unicom, KT Corp. (South Korea), Chunghwa Telecom, and NTT Communications. APG provides robust intra-Asia connectivity and is a key route for high-capacity traffic between China and South Korea .
Additional Context
- Submarine Cable Map: TeleGeography maintains an interactive map of global submarine cables, including landing points in China and South Korea, which helps visualize the network and identify alternative routes .
- Technical Considerations: These cables use dense wavelength-division multiplexing (DWDM) to maximize capacity and ensure low-latency, high-reliability connections. They are critical for internet, cloud services, and international data traffic between the two countries.
- Commercial and Strategic Importance: Direct China–South Korea cables reduce dependency on third-party hubs, improve latency for financial and enterprise applications, and enhance redundancy in the Asia-Pacific region. These submarine optical fiber systems form the backbone of high-speed communication between China and South Korea, supporting both commercial and strategic data transmission needs.
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