H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/08 (2006.01) G01M 11/00 (2006.01) G01M 11/02 (2006.01)
Patent
CA 2157517
A method and apparatus for inducing a localised optical transmission loss in an optical fiber cable is described, which is particularly well suited for use with optical time-domain reflectometry (OTDR) equipment to aid in locating faults in an optical fiber cable. A small portion of the optical fiber cable is cooled, such as by immersion in a cryogenic liquid like liquid nitrogen, and fibres in the cooled cable portion exhibit localised optical transmission loss which can be detected as a point loss (26) with the OTDR trace (24). The technique of inducing the point loss in non-invasive, and the localised transmission loss disappears when the cable portion returns to the ambient temperature, without damage to the cable.
Clarke Kenneth Paul
Coulson David
Gibbs Ernest Edward
Keon Barry John
Kruijshoop Alfred Willem
Oyen Wiggs Green & Mutala
Telstra Corporation Limited
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