Highest Core Count Optical Cable

The current highest-core optical cables include NTT's 192-core submarine cable and Furukawa/Fujikura's 13,824-fiber ultra-high-density data center cables.NTT 192-Core Submarine CableNTT has developed the world's highest-capacity 192-core submarine cable using multicore optical fiber (MCF), which allows a fourfold increase in transmission capacity without changing the overall cable system . This technology is designed for submarine networks and includes specialized joint boxes and terminal racks to connect conventional fibers with MCF cables. It represents a major advancement in high-capacity undersea communications, supporting economical deployment and meeting growing global data transmission demands .Furukawa and Fujikura 13,824-Fiber CablesFor hyperscale data centers, Furukawa Electric and Fujikura have developed ultra-high-density optical fiber cables with 13,824 fibers per cable, currently among the highest fiber counts in the world . These cables use rollable ribbon technology and Spider Web Ribbon (SWR) designs, allowing multiple fibers to be mass-fusion spliced while maintaining a thin cable diameter (less than 40mm). This high fiber density is critical for data centers where space is limited but transmission capacity must be maximized .Other Notable High-Core DevelopmentsNTT and NEC 12-core multicore fiber: Used in long-distance submarine transmission experiments, demonstrating the potential for multicore fibers to increase capacity without enlarging the fiber diameter .NICT 19-core optical fiber: Achieved 1.02 petabits per second over 1,808 km, setting a world record for long-distance high-capacity transmission using a standard 0.125 mm cladding diameter .SummarySubmarine networks: NTT's 192-core MCF cable is the current leader in core count for undersea applications.Data centers: Furukawa and Fujikura's 13,824-fiber cables provide the highest fiber density for hyperscale environments.High-capacity transmission experiments: 19-core and 12-core fibers demonstrate record-breaking data rates and long-distance capabilities. These developments highlight the trend toward multicore and ultra-high-density optical fibers, enabling massive increases in data transmission capacity while optimizing space and infrastructure costs.