Low temperature dry loose tube fiber optic cable

Details Low temperature dry loose tube fiber optic cable Low temperature dry loose tube fiber optic cable

2006-08-29

2006-08-29

Healy, Brian (Department: 2883)

Optical waveguides

Optical transmission cable

Loose tube type

C385S100000, C385S110000, C385S111000, C385S112000

Reexamination Certificate

active

07099542

ABSTRACT:
A water blocking configuration for a low temperature, dry loose tube fiber optic cable includes one or more flexible buffer tubes each having a passage sized to contain one or more optical fibers. A single yarn is disposed in the passage of each buffer tube, and the yarn has a denier of not more than 1500. The yarn is coated with particles of a water absorbent material having a size distribution of between zero and not more than 160 microns. A dry loose tube fiber optic cable having the disclosed configuration meets the Telcordia GR 20 (Issue 2) industry standard with respect to water penetration, change of fiber attenuation, and fiber tensile strength at a low temperature of −60 degrees C.

REFERENCES:
patent: 4909592 (1990-03-01), Arroyo et al.
patent: 5630003 (1997-05-01), Arroyo
patent: 6088499 (2000-07-01), Newton et al.
patent: 2003/0026559 (2003-02-01), VanVickle et al.
Fitel USA Corp., OFS Fortex(tm) DT Cable, product brochure two pages (2003).
FIBERLINE, Draft Product Specification for FL-P250LS/Swellcoat-3 yarn, one page (Dec. 5, 2003).

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