Abstract

A compact acousto-optic (AO) filter with multireflector (MR) beam expanders constituted by 32 photonic crystal rows of airholes in LiNbO3 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 70μm×150μm, with an FWHM bandwidth of 4.4nm, a tuning range of 110nm, internal loss of 3dB, and sidelobes of 20dB, thus providing a unique value of 0.6μm2 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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