Optical fibre assemblies for blown installation

摘要

An optical fibre assembly 10 for blown installation, comprises a fibre unit 12 having at least one optical fibre 14. The unit has a coating comprising an external layer 18 of a material containing hollow glass beads 22 at least some of which project from the outer surface 24 of the external layer. The coating also has an inner, buffer layer 16 of a material having a lower modulus of elasticity than that of the material of the external layer and an intermediate layer 20 of material disposed between the external and inner layers.