A 4×4 nonblocking integrated acousto-optic space switch has been realized, for the first time, in a Y-cut LiNbO3 channel-planar-channel composite waveguide 0.1×1.0×3.0 cm3 in size. Measured performances for nonblocking switching at the optical wavelength of 0.6328 μm include a worst-case crosstalk of −15.6 dB, an average throughput of −16.0 dB, a frequency resolution (frequency increment required for switching between adjacent output ports) of 18.0 MHz, and a reconfiguration time of 0.145 μs.

Successful experimentation on acousto-optic Bragg diffraction in a LiNbO3 composite waveguide that consists of an array of parallel but uncoupled channel waveguides directly extended to a single-mode planar waveguide and a titanium-indiffused proton-exchanged (TIPE) microlens array is reported for the first time. A channel-waveguide array, a planar waveguide, a linear TIPE microlens array, a 500-MHz surface acoustic wave transducer, and an integrating lens have all been integrated in a substrate size of 0.2×1.0×2.0 cm to form an integrated acousto-optic Bragg modulator that should find a variety of applications in optical computing, signal processing, and communications. The resulting modulator module has been utilized to perform matrix-vector multiplication.

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