Abstract

In recent publications¹,² a single-mode fiber signal processor was proposed capable of performing Toeplitz matrix-vector multiplication at gigahertz. We propose an integrated-optic Toeplitz matrix-vector processor that should be capable of operation at several tens of gigahertz. The multiplier is implemented in a Ti:LiNbO₃ waveguide. It comprises an optical delay line, tapped by N electrooptic gratings of efficiency ηi = i/N, i= 1,2,…, N, located a distance L = Tc/n apart along the line. Here T is the period of the input data stream, and n is the effective index of the waveguide, typically around 2.2 for TE waves in Ti:LiNbO₃ at 633 nm. The light from the taps is directed to a second set of gratings which implement the matrix entries. The resulting refracted beams are passed on to an integrating lens. Clearly, the smaller the distance L, the higher the data rate (1/T) that can be implemented. For L = 2 mm, data rates of 68 GHz are allowed. Design details for a 2 × 2 multiplier, planned for device demonstration, are presented.

© 1988 Optical Society of America