Abstract
This paper describes the acousto-optic properties of hole-assisted fibers (HAFs)
numerically and experimentally. We show that the HAF beat length between the guided and
first higher-order modes has small wavelength dependence compared with that of the
single mode fiber and so we can achieve broadband acousto-optic coupling.
Ultra-broadband acousto-optic coupling is realized by using a HAF with flattened beat
length characteristics. The coupling bandwidth reaches 120 nm, and can be controlled by
designing the air hole structure.
© 2009 IEEE
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