High-packing-density multichannel integrated-optic modules in LiNbO_3 for a programmable correlation of binary sequences

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Abstract
Two 10-channel integrated-optic device modules have been constructed and tested. The architecture common to both modules consists of a LiNbO3 composite waveguide 1.0 cm × 2.0 cm in size in which a channel-waveguide array, a planar waveguide, a linear microlens array, an electro-optic Bragg modulator array or an acousto-optic and electro-optic Bragg modulator array, and a large-aperture lens are integrated. A novel scheme that employs a linear ion-milled planar microlens array was devised to excite the entire channel-waveguide array simultaneously, and thus greatly facilitate testing and application of the two device modules. The performance characteristics obtained in programmable correlation of binary sequences are also presented.