All-fiber anamorphic core-shape transitions
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Updated: Jul 20, 2026

Microfluidic Fabrication of Polymeric and Biohybrid Fibers with Predesigned Size and Shape
Published on: January 8, 2014
A Witkowska1, K Lai, S G Leon-Saval
1Department of Physics, Unviersity of Bath, Claverton Down, Bath, UK.
Abstract:
We demonstrate low-loss anamorphic transitions between circular and rectangular fiber cores with aspect ratios up to 5:1, and hence improved coupling from a diode laser by using only a spherical lens. Differential hole pressurization and localized heating of a stock photonic crystal fiber inflates the holes at different rates. Some holes are plugged in the fiber end face where pressure is applied, so they remain at ambient pressure. Alternatively, holes of different sizes expand at different rates because the effective pressure due to surface tension differs.
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