j-fiber — High-Performance Optical Fibers Made in Germany

j-fiber GmbH is a leading German manufacturer of high-performance optical fibers and preforms designed to connect modern data networks across the globe. With deep roots in Jena’s rich fiber-optic heritage, j-fiber specializes in delivering standards-compliant multimode, singlemode, and specialty fiber solutions for data centers, telecommunications infrastructure, and advanced photonics applications. As one of Europe’s only industrial-scale optical fiber producers, j-fiber combines robust research and development, certified quality systems, and a vertically integrated value chain from synthetic quartz production to customized fiber services to help customers build future-proof, high-capacity networks.