Optical waveguides – Optical transmission cable – Loose tube type
Patent
1991-10-24
1992-10-20
Healy, Brian
Optical waveguides
Optical transmission cable
Loose tube type
385109, 385111, 385113, 57 5, 57 14, G02B 644, D02G 336
Patent
active
051577526
ABSTRACT:
Optical cable with optical fibers and a water blocking element extending together along a passageway. The water blocking element swells upon contact with water so as to block the passageway against water migration. The water blocking element may be of filamentary structure, e.g. string or tape which acts as a carrier for water swellable particles, e.g. polyacrylate. The water blocking element may, however, be a filament of the swellable material which is spun with other filaments, e.g. polyester to form a string. The cable may be air pressurizable.
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Chiasson David W.
Fedoroff Michael S.
Fidler Joyce J.
Greveling Johannes I.
Rawlyk Michael G.
Austin R. J.
Healy Brian
Northern Telecom Limited
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