INTEGRATED ACOUSTOOPTIC MODULES FOR INTERFEROMETRIC RF SPECTRUM ANALYZERS

An integrated acoustooptic (AO) module that consists of a wideband AO Bragg cell, a wide-angle ion-milled concave Bragg grating lens, and a large-aperture titanium-indiffusion proton-exchange (TIPE) lens has been realized in a Y-cut LiNbO3 waveguide 1 x 8 x 16 mm3 in size and used to perform interferometric RF spectrum analysis. This integrated AO spectrum analyzer module has provided a bandwidth of 205 MHz centered at 350 MHz and single-tone instantaneous and two-tone, third-order spurious-free dynamic ranges of 50 and 40 dB, respectively, at 1.0 mW of 0.6328 mu-m laser power and drive power of 50 mW per RF signal. Moreover, a pair of such basic AO modules has been integrated in a common LiNbO3 substrate 1 x 10 x 16 mm3 in size to facilitate measurement of the phase difference, and thus the angle of arrival of RF signals.