Daetwyler Cables has extended its fibre-to-the-home (FTTH) portfolio to include special fibre-optic cables with a large number of fibres which are extremely thin and fit in even the narrowest microducts. Employing the new “S-Micro” cables for connections in the local or “drop” loop, suppliers are able to utilise the existing pipe infrastructure, particularly from the vertical duct to the building basement, in the best possible way, to connect up homes and to reduce the trench work.
Daetwyler Cables developed the “S-Micro” Optofil cables in collaboration with the Swiss electricity and public utility companies of Zurich (ewz), Sankt Gallen (sgsw) and Berne (ewb). The first models have 48 and 96 monomode fibres (E9/125) in stranded loose tubes, each with up to 12 fibres. Both models are available with bend-optimised G.657.A fibres, and the 96-fibre cable is also available with standard G.652.D fibre.
The metal-free S-Micro cables have an external diameter of just 4.2 or 6.2 mm. This means that the 48-fibre version can easily be blown into microduct systems with external diameters of 7.0 mm upwards (with 0.75 mm wall). The 96-fibre S-Micro is suitable for microducts from 10 or 12 mm (depending on cable sheath thickness). Initial blowing experiments have shown that the compact S-Micro cables can cover distances of up to 500 metres.
Previously, it was only possible to blow a 24-fibre Micro cable into a microduct with 7 or 10 mm external diameter. The new Optofil S-Micro has doubled the maximum number of fibres available to these ducts. Compared with its predecessor at least, the 96-fibre S-Micro makes it possible to use narrower microducts (10-12 instead of 14 mm) and therefore to connect more buildings.
The installation benefits and safety features of this FTTH cable are the same: every S-Micro has a ripcord and an easy-to-lay, installation-friendly cable structure. These cables are halogen-free and do not generate corrosive gases in the event of a fire.