Optical fibre with enhanced security against signal tapping

Details Optical fibre with enhanced security against signal tapping Optical fibre with enhanced security against signal tapping

G - Physics

02

B

88/97.6

G02B 5/14 (1980.01)

Patent

CA 1039095

OPTICAL FIBRE WITH ENHANCED SECURITY Abstract of the Disclosure An optical fibre h s 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 tap 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. - i -

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