A novel baseband integrated acousto-optic frequency shifter with a −3 dB tunable bandwidth of 121 MHz (from −61 to 60 MHz) at the optical wavelength of 0.6328 μm has been constructed in a Y-cut LiNbO3 waveguide, 0.2×1.0×2.0 cm3 in size. Suppression of the various unwanted components by as much as 50 dB has been accomplished. Since the frequency-shifted light propagates in a fixed direction, irrespective of the magnitude of frequency shift, this baseband acousto-optic frequency shifter can be readily used in fiber-optic systems.
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Cheng et al. (1992) studied this question.
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