Optical fibre unit for air-blown installation
AssigneePrysmian S.p.A.
InventorsRalph Sutehall, Susanna Santamaria, Daniel Shell, George Stephen Lucas
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Abstract
It is disclosed an optical fibre unit for air-blown installations comprising: a first group of optical fibres embedded in a resin layer; a sheath arranged in a radially outer position with respect to the resin layer so that an annular space is formed between resin layer and sheath; and a second group of optical fibres arranged in the annular space. Also disclosed are an apparatus and a method for manufacturing such optical fibre unit.
Claims18
An optical fibre unit for air-blown installation comprising:
- a first group of optical fibres;
- a resin layer substantially completely embedding the first group of optical fibres;
- a sheath arranged in a radially outer position with respect to the resin layer so that an annular space is formed between resin layer and sheath;
- a water blocking material in the annular space;
- and
- a second group of optical fibres arranged in the annular space, the optical fibres of the second group of optical fibres being laid about the resin layer and each substantial parallel to a longitudinal axis of the optical fibre unit, the second group of optical fibres each being completely embedded in the water blocking material.
A method for manufacturing an optical fibre unit for air-blown installation, the method comprising:
- providing a first group of optical fibres;
- substantially completely embedding the first group of optical fibres in a resin layer;
- arranging a second group of optical fibres about the resin layer, the optical fibres of the second group of optical fibres being laid about the resin layer and each substantial parallel to a longitudinal axis of the optical fibre unit;
- providing a sheath in a radially outer position with respect to the resin layer so that an annular space is formed between the resin layer and the sheath, the second group of optical fibres being arranged in the annular space;
- and
- providing a water blocking material in the annular space, the second group of optical fibres each being completely embedded in the water blocking material.
An optical fibre unit for air-blown installation comprising:
- a first group of optical fibres;
- a resin layer substantially completely embedding the first group of optical fibres;
- a sheath arranged in a radially outer position with respect to the resin layer so that an annular space is formed between resin layer and sheath, wherein the sheath is substantially coaxial with the resin layer and the annular space has a substantially constant thickness;
- and
- a second group of optical fibres arranged in the annular space, the optical fibres of the second group of optical fibres being laid about the resin layer, the second group of optical fibres each being completely embedded in a water blocking material within the annual space.
Dependencies are inferred from the claim text.