The OTDR will show a large loss at 1550, more than at 1310 same as for a macrobend. This will come and go as the ice compresses the cable. It will compress the cable through the jacket, shield, buffer tubes to cause the fibers to go bad.
I've had it happen in N. Georgia on top of a Silo at a chicken feed plant. Really bad location for a problem. That one actually broke several fibers. Had another one in Laurens SC for the phone company running through a conduit across a bridge. The center clamps came loose and the 2" rigid pipe sagged, filled up with water and was freezing after a few cold nights. This was AT&T unitube cable. Never though it would compress it enough to cause this but it did. Was shutting down Palmetto Net. Very excited customer. No long term problem, cut a coupling off, drained the water and reattached to bridge still working 5 yrs later. Third case was in Aiken SC for CATV co. Aerial splice case filled with water, froze and broke some fibers. Think about it, if ice can crush a ships hull it will compress a cable. My 2 cents worth.
Re: Thermal Cycling in Fiber Optic Cables
Member #: 21329
Registered: 2/9/2003
Posted:
242
Name:
Mike Hudson
Name:
Mike Hudson
Company:
R and M Technical Services, Inc.
Occupation:
RETIRED
Location:
Ninety Six, SC
Personal:
late 60s
Experience:
~49 years
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