Ranking of the longest optical fiber cables in China

China's longest optical fiber cables are primarily produced by YOFC, Hengtong, ZTT, and FiberHome, with individual cable spans reaching tens of thousands of kilometers in total network deployment.

Leading Manufacturers by Production Capacity

1. YOFC (Yangtze Optical Fibre and Cable Joint Stock Limited Company) YOFC is China's largest fiber optic cable producer, with an annual capacity of 300 million core-kilometers. Their cables include ultra-low-loss fibers (0.16 dB/km G.654.E) and high-density multi-core cables (up to 576 fibers), supporting submarine cables of 10,000 km spans and high-speed terrestrial networks . YOFC's extensive production and R&D capabilities make it the top contributor to China's longest cable deployments.
2. Hengtong Group Established in 1991, Hengtong is a major manufacturer with 11 production bases and a strong focus on submarine and terrestrial cables. They specialize in armored, OPGW, and high-capacity multi-core cables, enabling long-distance deployments for both telecom and energy sectors .
3. ZTT (Zhongtian Technology Group) ZTT produces over 3.5 million kilometers of optical cables annually, including single-mode, multi-mode, and specialized underwater and underground cables. Their products comply with international standards and are widely used in long-haul networks and submarine projects .
4. FiberHome Technologies FiberHome integrates active networking equipment with passive fiber optics, producing high-density cables suitable for dense urban and long-distance networks. Their solutions are often deployed in FTTH and backbone networks, contributing to extensive cable lengths across China .
5. Futong Group Futong focuses on high-volume duct fiber optic cables and residential broadband infrastructure, supporting long-distance terrestrial networks with standardized quality control .

Cable Types and Deployment

• Submarine Cables: YOFC and Hengtong lead in ultra-long submarine cables, with spans up to 10,000 km, connecting China to global networks .
• Terrestrial Backbone Cables: Multi-core armored cables (up to 576 fibers) are deployed across provinces, supporting hundreds of kilometers per segment.
• High-Density Urban Networks: FiberHome and Futong provide micro-distribution and FTTH cables for dense urban areas, contributing to the overall network length.

Summary

While there is no publicly available list of individual longest single cables, the ranking of manufacturers by production capacity and technological capability effectively reflects which companies are responsible for China's longest optical fiber deployments. YOFC, Hengtong, ZTT, and FiberHome dominate in both terrestrial and submarine cable lengths, with YOFC leading in ultra-long submarine spans and high-density multi-core cables .