Abstract
Effect of filler metals (Bi, 80Au-20Sn alloy, Sn, and In) on the temperature sensitivity of a birefringent side-hole fiber was investigated. The temperature sensitivity of the fiber was found to increase by introduction of the filler metals and the sensitivity gradually increased with the increase of the thermal expansion coefficient of metals. The sensitivity was larger for the filler metals with the larger thermal expansion coefficient.
Highlights
Different types of birefringent fibers have been developed with the cross-sectional structures of the PANDA, the bow-tie, the elliptical core, and the internal elliptical cladding [1]
Birefringent fibers are used as a polarization maintaining element in optical communication systems and a non-reciprocal optical element in Sagnac loop interferometers for optical filter and sensor applications
Small temperature sensitivity is required for the stable operation, while large temperature sensitivity is desired in the temperature sensing applications
Summary
Different types of birefringent fibers have been developed with the cross-sectional structures of the PANDA, the bow-tie, the elliptical core, and the internal elliptical cladding [1]. For sensing and electro-optic device applications of the side-hole fibers with metals, understanding the effect of filler metals on the optical, electrical, mechanical, and thermal characteristics of the fibers is very important. Various metals such as bismuth-tin alloy [9,15], aluminum [10], gold-tin alloy [12,13,14,15], and indium [5], have been tested as electrodes or stress inducing materials and their mechanical properties and electrical stabilities of the metals have been verified. The temperature sensitivity of the fibers was found to increase by the filler metals and the extent of the increase strongly depended on the thermal expansion coefficient of the metals
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