Title :
A novel integrated acoustooptic frequency shifter
Author :
Cheng, Zhe Y. ; Tsai, Chen S.
Author_Institution :
Dept. of Electr. Eng., California Univ., Irvine, CA, USA
fDate :
10/1/1989 12:00:00 AM
Abstract :
An integrated optical frequency shifter that utilizes guided-wave acoustooptic Bragg diffractions in cascade from two tilted- and counterpropagating-surface acoustic waves is reported. The doubly and frequency-shifted diffracted light propagates in a fixed direction, but spatially resolved from the incident light, irrespective of the magnitude of frequency tuning. A device fabricated in a Y-cut LiNbO3 planar waveguide has demonstrated desirable characteristics, including single-sideband suppressed-carrier properties, a frequency shift centered at 1 GHz, a tunable bandwidth of 165 MHz, a linear dynamic range greater than 41 dB, and high efficiency at the optical wavelength of 0.63 μm. These preliminary results suggest that a compact integrated acoustooptic frequency shifter module capable of multigigahertz center frequency and gigahertz bandwidth can be realized in a common LiNBO3 substrate 0.2 cm×1.0 cm×1.5 cm in size
Keywords :
acousto-optical devices; integrated optics; lithium compounds; optical waveguides; surface acoustic wave devices; 0.2 cm; 0.63 micron; 1.0 cm; 1.5 cm; 165 MHz; LiNBO3 substrate; LiNbO3; SAW; Y-cut LiNbO3 planar waveguide; cascade; fixed direction; frequency shift; frequency tuning; gigahertz bandwidth; guided-wave acoustooptic Bragg diffractions; high efficiency; integrated acoustooptic frequency shifter; linear dynamic range; multigigahertz center frequency; optical wavelength; single-sideband suppressed-carrier properties; spatially resolved; tilted counterpropagating surface acoustic waves; tunable bandwidth; Acoustic diffraction; Acoustic propagation; Acoustic waves; Bandwidth; Frequency; Integrated optics; Optical diffraction; Optical propagation; Optical tuning; Spatial resolution;
Journal_Title :
Lightwave Technology, Journal of
