Abstract

This paper presents improvements to slab-coupled optical fiber sensors for electric-field sensing. The sensors are comprised of a potassium titanyl phosphate (KTP) crystal mounted on a $D$-fiber. The improvements are based on changing the crystal orientation, which enhances sensitivity due to a combined increase in the effective electro-optic coefficient and electric-field penetration into the KTP crystal. The paper provides a detailed comparison of the improved sensor, which uses $x$-cut KTP to the previous sensor design using $z$-cut KTP. The measurements show an $8.6\times$ improvement in the sensitivity.

© 2013 Optical Society of America

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