Abstract

A single-mode fiber (SMF) acousto-optic tunable filter (AOTF) with a tuning range of more than 300nm is demonstrated. The SMF used in the experiment has a ring of symmetric holes within the cladding, which causes a larger mode-index difference between the first and the second higher-order antisymmetric modes than those of a conventional SMF. As a result, the difference in beatlengths between the core mode and the higher-order modes is highly increased, which makes it possible for the SMF AOTF to exhibit a single resonance peak in the transmission spectrum over the wavelength range of 1.31.6μm for given acoustic frequencies of 3.13.8MHz.

© 2011 Optical Society of America

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