A team of researchers at Keio University (President: Kohei Itoh) has successfully developed a multi-core graded-index plastic optical fiber (GI-POF) capable of ultra-high-speed data transmissions at up to 106. Multi-core optical fiber, with its ability to transmit multiple signals simultaneously, has emerged as a promising solution to meet this demand. Additionally, due to its characteristics such as multi-channel transmission, high integration, spatial flexibility, and versatility, multi-core optical. WO2025204844 - MULTI-CORE PLASTIC OPTICAL FIBER, OPTICAL COMMUNICATION CABLE, AND OPTICAL COMMUNICATION SYSTEM The purpose of the present invention is to provide a multicore plastic optical fiber, an optical communication cable, and an optical communication system using them that are capable of. The optical fibers that underpin current communications are single-mode optical fibers (SMFs), which have only one core (the path through which light travels). Unveiled at the 2026 Optical Fiber Communication Conference, our 4-core multicore fiber increases network capacity by packing multiple independent data paths into a single strand of optical fiber — without increasing the outer diameter of the fiber. To address the growing demand for bandwidth and the challenges of building higher-performance networks, Multi-Core Fiber (MCF) technology has emerged.
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