Fiber optic components for subsea cables

Our FIMTs are the cornerstone for robust subsea cable systems, offering unparalleled strength and high-capacity fiber integration essential for deep-sea communication networks.

FIMT for Subsea cables

NBG’s Fiber in Metal Tubes (FIMTs) offer a pivotal solution for manufacturers of subsea cables, providing a blend of durability and advanced technology crucial for deep-sea environments. Our FIMTs are engineered to withstand the unique challenges of subsea applications, including high pressure, corrosive saltwater, and physical stressors. The tubes are capable of housing up to 192 fibers, optimizing data transmission capacity in a compact form, essential for the confined spaces of subsea cables. Additionally, the availability of these components in continuous lengths of up to 50 kilometers reduces the necessity for frequent splicing, enhancing the overall integrity and reliability of the cable systems. Backed by NBG’s commitment to excellence in manufacturing and quality control, our FIMTs are designed to be a vital component in the construction of robust, efficient subsea cable networks.

Example configurations

All our products are custom and designed to spec. Below are just a few examples to demonstrate our production capabilities.

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Need more information?

See our FIMT for HV/MV cables datasheet.

Outer diameter

from 1.10mm / 0.043 ″
to 5.30mm / 0.209 ″

Fiber count

1-144 (250μm)
1-192 (200μm)

Tube wall thickness

from 0.125mm / 0.0049 ″
to 0.30 / 0.0118 ″

Outer insulation

PA / LD / HD / XLPE / PVC FRNC / TPE / Semi-conductive PE

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Frequently asked questions

The maximum continuous length we offer for our FIMTs in subsea cables is up to 50km. This extended length significantly reduces the need for splicing, facilitating a smoother and more efficient installation process, and enhances the integrity of the cable system by minimizing potential points of failure.

We can accommodate up to 192 fibers within a single FIMT. This high fiber count per tube enables more data transmission capacity, making our FIMTs an economically sensible choice for large-scale subsea communication infrastructures.

Our range of water-blocking solutions includes a variety of gels and yarns designed to prevent water ingress, ensuring the optical fibers remain protected even in the harshest subsea environments and unlikely scenarios of a compromised outer sheath of the subsea cable.

Water-blocking elements are crucial for maintaining the integrity and performance of subsea cables. They prevent water from entering and damaging the fibers, which could lead to signal degradation or failure. By using these elements, we ensure the longevity and reliability of the cable throughout its operational life.

Absolutely. We provide customization options for our FIMTs, including the choice of fiber count, continuous length, and the specific type of water-blocking gels and yarns. This flexibility allows us to cater to the unique requirements of each subsea cable project, ensuring optimal performance and protection.