Title :
Low-sidelobe weighted-coupled integrated acoustooptic tunable filter using focused surface acoustic waves
Author :
Kar-Roy, Arjun ; Tsai, Chen S.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA
Abstract :
A single-stage low-sidelobe weighted-coupled integrated acoustooptic tunable filter (IAOTF) operating at the optical wavelength of 1.31 mu m has been realized on a Y-cut X-propagating LiNbO/sub 3/ substrate for the first time. The weighted-coupling, which enabled the achievement of low-sidelobe levels, was facilitated by focused surface acoustic waves generated by a curved interdigital transducer. First sidelobe levels as low as -17.6 dB have been obtained. Optical bandwidth of 4 nm and tuning range of 170 nm for an interaction length of 6 mm were also accomplished.<>
Keywords :
acousto-optical devices; integrated optics; lithium compounds; optical filters; surface acoustic wave filters; tuning; 1.31 micron; 6 mm; IR; LiNbO/sub 3/ substrate; X-propagating; Y-cut; curved interdigital transducer; focused surface acoustic waves; interaction length; low-sidelobe; optical bandwidth; optical waveguides; optical wavelength; single-stage; tuning range; weighted-coupled integrated acoustooptic tunable filter; Acoustic waves; Indium phosphide; Optical crosstalk; Optical filters; Optical modulation; Optical pulse generation; Optical surface waves; Optical waveguides; Surface acoustic waves; Tunable circuits and devices;
Journal_Title :
Photonics Technology Letters, IEEE
