Abstract
A method of fabricating dual-core photonic crystal fiber(PCF) using secondary drawing technique is presented. The diameter of fiber core can be reduced to 4μm by placing the thin preform into glass sleeve for secondary drawing. Dual-core PCF, partial dual-core PCF and non-centrosymmetric dual-core PCF are successfully prepared by secondary drawing technology combined with air pressure regulation. A curvature sensing system is built. When the length of partial dual-core PCF is 105 mm, the measured curvature sensitivity is −3.79944 nm/m−1. Through the water bath temperature experiment, the measured temperature sensitivity is 21 pm/∘C, and the cross interference caused by temperature value on curvature value is very small. When the length of non-centrosymmetric dual-core PCF is 207 mm, the curvature sensitivity measured by forward bending and negative bending is 4.68429 nm/m−1 and −4.68808 nm/m−1, respectively. The measured temperature sensitivity is −13 pm/∘C, and the cross interference of temperature on curvature can be ignored.
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