Abstract

We demonstrate the sensitivity of Bragg gratings in a multicore fiber to transverse load. The Bragg peaks are split because of stress-induced birefringence, the magnitude of which depends upon the load and grating position relative to the load axis. Experiments show that a set of gratings in a four-core fiber can measure a load axis angle to ±5° and a load magnitude to ±15 N m−1 up to 2500 N m−1. We consider alternative designs of multicore fiber for optimal load sensing and compare experimental and modeled data.

© 2005 Optical Society of America

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