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Largest core optical cable

ODN and passive infrastructure knowledge brief Published 28 Mar 2026

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

The current largest core optical cables have 13,824 individual fiber cores, developed for ultra-high-density data transmission.Overview of Ultra-High-Density Optical Cables

The largest core optical cables in the world are 13,824-core ultra-high-density cables, recently developed and mass-produced by companies such as Furukawa Electric and China Information and Communication Technologies Group Corporation (CICT) . Each "core" represents a single optical fiber capable of transmitting light independently, meaning a single cable can carry 13,824 separate data channels simultaneously.

Technical Features
  • Outer Diameter: Despite the massive number of cores, these cables maintain a compact 40 mm diameter, roughly the size of a golf ball .
  • Fiber Arrangement: The high density is achieved using rollable ribbon technology, where ultra-thin fibers (0.2 mm each) are bonded into flexible ribbons and efficiently folded within the cable .
  • Transmission Capacity: Doubling the fiber count compared to previous generations effectively doubles the data transmission capacity, making these cables ideal for AI-focused data centers and hyperscale computing environments .
  • Efficiency: A single 13,824-core cable can replace 48 conventional 288-core cables, saving over 90% of pipeline resources and reducing installation complexity .
Applications

These ultra-high-density cables are primarily used in:

  • Data Centers: Supporting massive interconnectivity for AI accelerators and GPU clusters.
  • High-Capacity Networks: Enabling large-scale optical communication infrastructure with minimal physical footprint.
  • Submarine Networks: While submarine cables like NTT's 192-core multicore optical fiber exist, the 13,824-core cables are optimized for terrestrial high-density deployments rather than long-distance undersea transmission .
Comparison to Other High-Core Cables
  • NTT 192-Core Submarine Cable: Designed for undersea networks, it uses multicore optical fiber (MCF) to quadruple transmission capacity without increasing cable diameter .
  • 19-Core Long-Distance Fiber: Achieved record transmission of 1.02 petabits per second over 1,808 km, demonstrating high-capacity long-haul performance .
  • 13,824-Core Cables: Focused on ultra-dense, short-distance, high-bandwidth applications, particularly in AI and hyperscale data centers .
Key Takeaway

The 13,824-core optical cable represents the largest number of cores in a single optical cable to date, combining extreme fiber density with compact design to meet the growing demands of AI, cloud computing, and high-speed data networks. This innovation significantly improves cabling efficiency, reduces infrastructure costs, and supports the next generation of high-capacity optical communication systems.

Largest core optical cable - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

Largest core optical cable

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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