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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. [ABSTRACT FROM AUTHOR]

Single-mode planar waveguide microlenses and microlens arrays in LiNbO3 have been fabricated using a combination of titanium diffusion and proton exchange processes. The lenses have demonstrated properties such as very short focal length, micron focal spot size, and large angular field of view that are desirable for applications in integrated and fiber-optic signal processing and computing as well as communication systems. [ABSTRACT FROM AUTHOR]