TOKYO, May 26, 2026―As part of the Ministry of Internal Affairs and Communications-commissioned research and development project, "Research and Development (JPMI00316) of Advanced Optical Transmission Technology Contributing to a Green Society", Oki Electric Industry Co., Ltd. (OKI), Lightera Japan Co., Ltd. (Lightera), and Keio University have used the "Keio Future Photonic Network Open Lab" established by Keio University, and announced the result of a demonstration of a next-generation optical line using hollow-core fiber. By combining a prototype of a next-generation optical line system developed by OKI with the hollow-core fiber developed by the Lightera Group, we succeeded, for the first time in the world, in the single-fiber bidirectional wideband WDM transmission in 1.26 μm - 1.58 μm, and also confirmed minimized power consumption by switching to the optimal optical line system. When commercialized, it is expected to reduce wasted power (theoretically to one-tenth of current electricity consumption) while meeting the increasing traffic demands. Three members will continue to advance research and development, aiming to realize carbon neutrality by 2050 and to generate new services leveraging low-latency of transmission.
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