Fuller Research Corporation

John G Kwasegroch

Terry A Fuller

An apparatus for detecting a break in an optical fiber adapted for carrying optical energy such laser energy. The optical fiber has a core, a cladding concentric with and surrounding the core and a sheath concentric with and surrounding the cladding. A detector is located within the sheath and has a portion thereof contiguous with the cladding. The detector is adapted to detect both a break in the portion contiguous to cladding as a result of a break in the fiber and a change in transmission of optical energy resulting from a break in the fiber without a concomitant break in the contiguous portion, and to provide a signal indicative of a break in the fiber.

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Algonquin, IL, United States of America

John G Kwasegroch