A New Fiber Optic Life for Old Ducts

摘要

Systems are described where loose bundles of 7 and 10 mm mini-tubes are jetted into ducts. In these mini-tubes, which can be coupled together into long routes including branches, micro-cables with up to 72 fibers each can be jetted in. These high performance mini-tubes allow jetting of the cables over 2500 m (8000') per single blow, thus offering the possibility to upgrade old ducts. Bundles of mini-tubes can also be installed in ducts occupied with one or more resident cables. Different trials and projects are described in this paper.