Optical fibre with increased security

Details Optical fibre with increased security Optical fibre with increased security

1977-05-02

1979-01-16

Corbin, John K.

G02B 514

Patent

active

041346424

ABSTRACT:
An optical fibre has a plurality of light conducting cores surrounded by a cladding layer of lower refractive index than the cores. A light conducting layer is on the cladding layer with a refractive index higher than that of the cladding layer, and a second cladding layer surrounds the light conducting layer and has a refractive index lower than that of the light conducting layer. Data signals can be propagated in the cores and a monitoring signal in the light conducting layer. Any attempt to tap the fibre to abstract data information results in aberration of the monitoring signal. Thus there is provided a secure optical fibre cable.

REFERENCES:
patent: 3372969 (1968-03-01), Snitzer
patent: 3823996 (1974-07-01), Kompfner et al.
patent: 3981592 (1976-09-01), Williams
patent: 4000416 (1976-12-01), Goell

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