Intrusion-free optical cable

Details Intrusion-free optical cable Intrusion-free optical cable

1979-12-17

1982-02-09

Levy, Stewart J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

350 9630, 340380, G02B 514

Patent

active

043147410

ABSTRACT:
An intrusion-free optical cable of the type wherein one or more signal-carrying optical fibers are carried within an outer cladding which will self-destruct, with or without destruction of the inner signal-carrying fiber, in the event an attempt is made to penetrate the outer cladding and extract a signal. Self-destruction is sensed to indicate that an attempt has been made to penetrate the outer cladding. Various embodiments of the invention are shown including a cladding formed from tempered glass which will shatter when an attempt is made to penetrate it. In another embodiment, a laser is employed which directs a light beam through the cable. This light beam is of sufficient power to melt, or at least raise the temperature of, the cladding or fiber at a point where penetration is attempted such that the severance or rise in temperature can be detected.

REFERENCES:
patent: 4000416 (1976-12-01), Goell
patent: 4134642 (1979-01-01), Kapron et al.
patent: 4174149 (1979-11-01), Rupp

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