STL, a leading optical and digital solutions company, showcased its advanced Unitube single sheathed indoor optical cable at the Connected Britain 2025 exhibition, which utilizes four core multi-core fiber technology. Multi core fiber technology integrates four fiber cores into the same cladding while maintaining the standard single-mode fiber cladding diameter (250/200 microns) unchanged.

STL is one of the first companies to showcase the practical deployment of multi-core fiber optic technology, which covers underground pipeline networks and has a complete ecosystem of fiber optic, fiber optic, and termination solutions. On this basis, STL developed the Unitube single sheathed indoor optical cable using multi-core fibers. This optical cable is not only designed for high-performance, but also emphasizes safety in harsh indoor environments. Through EU building product regulations Cca-s2, d1, a1 level certification, the product has high fire resistance and can protect critical infrastructure in the event of a fire. This certification makes STL fiber optic cables particularly suitable for data centers, campus networks, commercial buildings, and other indoor installation scenarios that require high-capacity data transmission and comply with strict fire safety standards. The supporting optical distribution unit and connection solution can simplify the integration process of existing network architecture.

STL’s Unitube single sheathed multi-core indoor fiber optic cable has the following characteristics: excellent security – supporting quantum key distribution technology, providing physical and digital tamper proof encryption; Future oriented bandwidth – supporting next-generation applications such as AI, 5G, and quantum computing, with transmission potential up to four times that of traditional fiber optics; Compact and efficient – accommodating multiple fiber cores in smaller diameters can double the number of optical fibers (e.g. 864 4-core fibers are equivalent to 3456 traditional fibers), increasing capacity without increasing footprint; High return on investment – Build a secure and scalable network backbone through a single deployment.

Dr. Badri Gomatam, Chief Technology Officer of STL, stated, “Through continuous innovation and global collaboration, STL is accelerating the implementation of advanced optical technologies. Our Unitube single sheathed multi-core indoor fiber optic cable is designed to meet high-capacity, secure, and future oriented network requirements. With continuous global standardization practices and practical deployment experience, we are proud to lead the evolution of optical infrastructure that supports the next generation of applications. “