Intrusion detection system for a multimode optical fiber...

Optical waveguides – Optical waveguide sensor

Reexamination Certificate

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Details

C385S013000, C385S029000, C398S020000, C398S028000, C398S033000

Reexamination Certificate

active

07403674

ABSTRACT:
Intrusion detection of one section only of a multimode fiber uses a light signal launched into the fiber at a location spaced from the source through a single mode fiber to establish a narrow spectral width, under-filled non-uniform mode field power distribution in the fiber. A small portion of the higher order signal modes at the a second location also spaced from the destination is sampled by a tap coupler and monitored for transient changes in the mode field power distribution which are characteristic of intrusion to activate an alarm. A fiber being used for data transmission can be monitored for intrusion by introducing a monitor wavelength different from that of the data signal. Central to this invention is the use of a bulk optic (commonly referred to as a pass/reflect) wavelength division multiplexer, one which maintains the modal distribution within the fiber.

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patent: WO 00/67400 (2000-11-01), None

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