Optical waveguides – Optical transmission cable – Tightly confined
Reexamination Certificate
2004-11-05
2010-12-28
Kianni, K. Cyrus (Department: 2883)
Optical waveguides
Optical transmission cable
Tightly confined
C385S103000
Reexamination Certificate
active
07860361
ABSTRACT:
An optical cable for communication includes at least one retaining element blocked with respect to the water propagation as well as a process for manufacturing such an optical cable. The optical cable includes, in addition to the retaining element, at least two transmission elements housed within the retaining element and a water swellable yarn housed within the retaining element. The water swellable yarn is selected according to the following equation:VwVTF=kVt+R(1)in which Vwis the volume of the water swellable yarn after swelling upon contact with water; VTFis the total free volume in the retaining element; k is a constant ≧180; R is a constant ≧1.4; and Vtis the free volume per each transmission element. Advantageously, the optical cable is water-blocked and the water swellable yarn does not induce microbending effects on the transmission elements.
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Consonni Enrico
Ginocchio Alessandro
Maritano Mauro
Pizzorno Massimo
Presa Paolo Arturo
Finnegan Henderson Farabow Garrett & Dunner LLP
Kianni K. Cyrus
Prysmian Cavi e Sistemi Energia S.R.L.
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