Abstract

We use hydrofluoric acid microdroplets to directly etch highly birefringent biconical fiber tapers from standard single-mode fibers. The fiber tapers have micrometer-sized cross sections, which are controlled by the etching condition. The characteristic teardrop cross section leads to a high group birefringence of BG0.017 and insertion losses <0.7dB over waist lengths of about 2.1 mm.

© 2012 Optical Society of America

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