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Article #17205

EMR from fiber-optic cables

#17205
From: steves
Date: Thu, 22 Jan 1987 21:03
21 lines
1495 bytes
A consortium of countries is laying a fiber optic cable under
the Atlantic from the US to France and England.  Before beginning
this, they beta-tested a piece of the cable off the Canary Islands.
According to Time magazine, this test gave the following results:
[This is not an exact quote, but is what I remember]

   "A certain kind of radiation, escaping from the cable, attracted
    alligator sharks which chomped through the cable.  The solution
    was to use heavier armour."

My question:  what kind of radiation escapes from a *fiber optic* 
cable?  After thinking about it for a while, I suppose that there
could be repeaters inside the cable that are powered by plain
old copper wires, and the current could generate an electro-magnetic
field.  But wouldn't the armor act as a shield?  

Anyone have any information?  Just curious.

Steve Shellans
Tektronix, Beaverton OR
{decvax, wyvax, ihnp4, ucbvax} !tektronix!tektools!steves
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From: steves@tektools.UUCP
Newsgroups: sci.electronics
Subject: EMR from fiber-optic cables
Message-ID: <2127@tektools.TEK.COM>
Date: Thu, 22-Jan-87 16:03:04 EST
Article-I.D.: tektools.2127
Posted: Thu Jan 22 16:03:04 1987
Date-Received: Sun, 25-Jan-87 00:08:30 EST
Organization: Tektronix Inc., Beaverton, Or.
Lines: 21
Keywords: fiber optic EMR alligator shark