Title :
Integrated acoustooptic tunable filters using weighted coupling
Author :
Kar-Roy, Arjun ; Tsai, Chen S.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA
fDate :
7/1/1994 12:00:00 AM
Abstract :
A detailed theory and experimental results are presented on weighted-coupling integrated acoustooptic tunable filters (IAOTF). A low-sidelobe-level single-stage IAOTF in which the weighted coupling was facilitated by focused surface acoustic waves along an interaction length of 6.0 mm has been realized on a Y-X LiNbO3 substrate, 8 mm in length. The measured performances of this weighted-coupling IAOTF at the optical center wavelength of 1.31 μm include a peak mode conversion at the acoustic center frequency of 214.6 MHz, a wavelength tuning range of 110 nm, a -3 dB optical bandwidth of 4.1 nm, and a switching rise time of 0.965 μs. Sidelobe levels below -21.4 dB have been accomplished at the mode-conversion efficiency of 15 percent and an RF drive power of 160 mW
Keywords :
acousto-optical devices; integrated optics; lithium compounds; optical filters; surface acoustic wave filters; tuning; 0.965 mus; 1.31 micron; 15 percent; 160 mW; 214.6 Hz; 6.0 mm; LiNbO3; RF drive power; Y-X LiNbO3 substrate; focused surface acoustic waves; integrated acoustooptic tunable filters; mode-conversion efficiency; optical bandwidth; sidelobe levels; single-stage IAOTF; switching rise time; wavelength tuning; weighted coupling; Acoustic measurements; Acoustic waves; Filtering theory; Frequency measurement; Optical filters; Optical surface waves; Performance evaluation; Surface acoustic waves; Time measurement; Wavelength measurement;
Journal_Title :
Quantum Electronics, IEEE Journal of
