Signal Processing in Integrated Optics Employing Geodesic Lenses

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Abstract
The implementation of integrated optics signal processors for one dimensional signals, as for instance radar signals, is a problem attracting increasing attention. The devices in mind are miniaturized analogic processors involving Fourier transformation properties of waveguide lenses. Among different types of lenses already suggested, geodesic lenses are the one currently feasible solution when,as usual, crystal substrates with high refractive index must be used. A method for designing generalized perfect geodesic lenses has been developed by the authors. The advantage of this method is represented by the easy theoretical approach and the large flexibility in the design without requiring long computations. The employment of such lenses in integrated spectrum analyzers and two lenses correlators is discussed taking into account the characteristics of the other components of these devices, as array detectors and Bragg acousto-optic modulators. A different geodesic correlator constituted by a portion of spherical surface is also briefly described.

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