On March 12, 2026, Lightera, the optical solutions arm of Japan's Furukawa Electric Group, announced the start of mass production of a 13,824-core ultra-high-density fiber optic cable, among the highest fiber counts in the world. Lightera is a global organization comprising Lightera Japan. Although larger cables are available, the highest strand-count single-mode fiber cable commonly manufactured is the 864-count, consisting of 36 ribbons each containing 24 strands of fiber. These high fiber count cables are used in data centers, and as distribution cables in HFC and. The total number of cores for a 1pc fiber patch cable is calculated as the number of branches multiplied by the number of cores per branch (if there are no branches, the number of branches = 1). (actually use a four core optical cable) This is because apart from one-core optical fiber, there are basically no optical cables with an odd number of cores, such as three-core, five-core, etc. The minimum bend radius is 15 times the cable diameter or 480mm (~19 inches), about a meter or yard in diameter.
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