Guided-wave acoustooptic tunable filters using simple coupling weighting technique

Author

Yamamoto, Y. ; Tsai, C.S. ; Esteghamat, K.

Author_Institution

California Univ., Irvine, CA, USA

fYear

1990

fDate

4-7 Dec 1990

Firstpage

605

Abstract

A simple acoustooptic (AO) coupling weighting technique for sidelobe suppression that involves only variation of the width of the surface acoustic wave (SAW) slot waveguide is presented. Calculations on single-stage and multistage acoustooptic tunable filters (AOTFs) consisting of an optical channel waveguide and a SAW slot waveguide in LiNbO₃ have shown that waveguide width coupling using the Hanning weighting function provides significant improvement in sidelobe suppression. Specifically, using the Hanning function a sidelobe level of -26 dB is predicted as compared to that of -9 dB with the conventional uniform coupling. Calculated results together with the design, fabrication, and preliminary measured performance characteristics of a single-stage guide-wave AOTF in YX-LiNbO₃ substrates at the optical wavelengths of 0.6328 and 1.55 μm are reported

Keywords

acoustic waveguides; acousto-optical devices; integrated optics; lithium compounds; optical filters; optical waveguides; surface acoustic wave filters; 0.6328 micron; 1.55 micron; Hanning weighting function; LiNbO₃ waveguide; SAW slot waveguide; coupling weighting technique; design; fabrication; guided wave filters; multistage acoustooptic tunable filters; optical channel waveguide; performance characteristics; sidelobe suppression; single-stage; Acoustic waveguides; Acoustic waves; Optical coupling; Optical design; Optical device fabrication; Optical filters; Optical surface waves; Optical waveguides; Surface acoustic waves; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Conference_Location

Honolulu, HI

Type

conf

DOI

10.1109/ULTSYM.1990.171434

Filename

171434