Abstract

The study presents a novel design of multiring delivery fiber with large mode area for high power. Using a FiberCAD method, we investigated a fiber whose core is surrounded by alternative low- and high-index rings. Based on our calculation, the effective area is 400μm2 at 1.08 μm, larger than the 280μm2 of conventional step-index fiber (20/400). The macrobending loss at 1.08 μm is estimated to be 1×103dB/m, approximately one-third that of conventional step-index fiber (20/400). The single-mode operation can be achieved by the macrobending loss contrast between the fundamental mode (<1dB/m) and high-order mode (>100dB/m). The results indicate that multiring delivery fiber fabricated by modified chemical vapor deposition process is a promising candidate for high-power transmission.

© 2013 Optical Society of America

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