Abstract

Many of the classical optical signal processing systems, built originally in bulk form, have recently been realized in integrated form. Included would be rf spectrum analyzers, correlators of various kinds, and matrix-vector multipliers. Integration has generally involved the combination of surface acoustic wave devices for introducing signals to the processors and discrete optical elements for focusing light. Output is usually accomplished through a separate array of detectors. The integrated versions of these processors have the advantages of small size, low weight, comparatively low power consumption, and ruggedness. With these attributes have come some problems. It is difficult to couple light efficiently into the thin planar waveguides that are used. In addition, there are reported difficulties in achieving the large dynamic ranges that are often required from these systems.

© 1991 Optical Society of America