Method and apparatus for inducing a temporary localized transmission loss in a telecommunications cable
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United States of America Patent
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Sep 30, 1997
Grant Date -
N/A
app pub date -
Nov 15, 1995
filing date -
Mar 18, 1993
priority date (Note) -
Expired
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Abstract
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 is non-invasive, and the localised transmission loss disappears when the cable portion returns to the ambient temperature, without damage to the cable.
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