Title :
Focused SAW induced sidelobe suppression of integrated acousto-optic tunable wavelength filters
Author :
Kar-Roy, Arjun ; Tsai, Chen S.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA
Abstract :
Weighted-coupled integrated acousto-optic tunable filters (IAOTFs) provide significant sidelobe level suppression over conventional uniform-coupling IAOTFs whose sidelobe levels are higher than -9.4 dB. A single-stage low-sidelobe IAOTF in which the weighted-coupling is facilitated by focused surface acoustic waves along an interaction length as short as 6.0 mm is realized on a Y-X LiNbO3 substrate, 8 mm in length. The measured performance characteristics of this weighted-coupling IAOTF at the optical center wavelength of 1.31 μm include peak mode-conversion at the acoustic center frequency of 214.6 MHz, a wavelength tuning range of 110 nm, -3-dB optical bandwidth of 4.1 nm, and a switching rise time of 0.965 μs. Sidelobe levels below -21.4 dB are achieved with mode-conversion efficiency of 15% and RF drive power of 160 mW
Keywords :
acousto-optical devices; integrated optics; lithium compounds; optical filters; surface acoustic wave filters; -3-dB optical bandwidth; 0.965 mus; 1.31 micron; 15 percent; 160 mW; 214.6 MHz; LiNbO3; RF drive power; acoustic center frequency; focused surface acoustic waves; integrated acousto-optic tunable wavelength filters; mode-conversion efficiency; optical center wavelength; peak mode-conversion; performance characteristics; sidelobe level suppression; switching rise time; uniform-coupling IAOTFs; wavelength tuning range; weighted-coupling; Acoustic measurements; Acoustic waves; Bandwidth; Frequency measurement; Optical filters; Optical surface waves; Optical tuning; Surface acoustic waves; Time measurement; Wavelength measurement;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.276042
