Optical fibre with enhanced security

Details Optical fibre with enhanced security Optical fibre with enhanced security

1976-04-16

1978-01-24

Corbin, John K.

G02B 514

Patent

active

040700917

ABSTRACT:
An optical fibre has a light conducting core surrounded by first and second cladding layers of sequentially lower refractive index. A data-carrying signal can be propagated in the core and a monitoring signal--of a higher modal order than the data signal--can be propagated in the core and first cladding layer. Any attempt to rap the fibre and abstract data information results in aberration of the monitor signal, which can be detected. The monitor signal can be such that resolvable signals cannot be obtained from the data channel by a tap.

REFERENCES:
patent: 3853384 (1974-12-01), Pinnow et al.
patent: 3981592 (1976-09-01), Williams
patent: 4000416 (1976-12-01), Goell

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