Abstract

A compact acousto-optic (AO) filter with multireflector (MR) beam expanders constituted by 32 photonic crystal rows of airholes in ${\mathrm{LiNbO}}_3$ waveguide has been proposed and numerically studied by the two-dimensional finite-difference–time-domain method. The diameter and position of every row of holes are gradually varied along MR beam expanders in order to provide high efficiency and good sidelobe suppression. Device sizes are $70\mathrm{\mu m}\times 150{\mathrm{\mu m}}^{}$, with an FWHM bandwidth of $4.4\mathrm{nm}$, a tuning range of $110\mathrm{nm}$, internal loss of $-3\mathrm{dB}$, and sidelobes of $-20\mathrm{dB}$, thus providing a unique value of $0.6{\mathrm{\mu m}}^2$ for the product FWHM bandwidth by an AO length. It is intended for use in fiber optics telecommunications and sensing.

© 2010 Optical Society of America

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