STL, a leading optical and digital solutions company, unveiled its advanced Unitube Single Jacket Indoor Fibre Optic Cable with 4-core Multi-Core Fiber (MCF) at Connected Britain 2025. This innovative technology allows the 4 cores to fit within the same cladding diameter as traditional single-mode fibre (SMF), with the coating size remaining at 250/200 micrometres.

STL is one of the first companies to showcase real-world deployments of MCF technology. This technology is used in both underground and duct networks and is supported by a full ecosystem of fibres, cables, and termination solutions. Building on this, STL has developed the Unitube Single Jacket Indoor Fibre Optic Cable with MCF, engineered for performance and safety in demanding indoor environments. The cable is certified under the Construction Products Regulation (CPR) EuroClass Cca-s2, d1, a1, ensuring high fire resistance and protection for critical infrastructure in the event of a fire. This certification makes STL's cable suitable for Data Centres, campus networks, commercial buildings, and other indoor applications where both high-capacity data transfer and stringent fire safety standards are essential. In addition, STL offers optical distribution units and connectivity solutions that simplify integration into existing network architectures.

Key features of the Unitube Single Jacket Indoor Fibre Optic Cable with MCF include:

Superior Security: Integrates Quantum Key Distribution (QKD) for tamper-evident encryption, safeguarding both physical and digital security.

Future-Ready Bandwidth: Supports next-generation applications, such as AI, 5G, and quantum technologies, offering up to 4× the throughput potential of traditional fibres.

Compact Efficiency: With the ability to pack multiple cores into a smaller diameter, it increases fibre count (e.g., 864 fibres with 4 cores = 3,456 fibres) without increasing the physical footprint.

High RoI: Offers a secure and scalable network backbone in a single deployment, maximizing return on investment.

Dr. Badri Gomatam, CTO of STL, emphasized: "Through continuous innovation and global partnerships, STL is accelerating the adoption of advanced optical technologies. Our Unitube Single Jacket Indoor Optical Fibre Cable with MCF is engineered to meet the ever-growing demands for high-capacity, secure, and future-ready networks. With our ongoing global standardisation efforts and real-world deployments, we are proud to lead the evolution of optical infrastructure that powers next-generation applications."

STL’s commitment to continuous innovation and advanced optical technologies positions it at the forefront of the optical infrastructure market, with solutions designed to support the demands of the next generation of applications.

This launch reaffirms STL’s role in shaping the future of high-capacity, secure, and reliable network solutions, catering to evolving needs in industries like AI, 5G, and quantum technologies.