The optical feature extractor is a photorefractive ring oscillator that can identify the strongest
spatio-temporal component of its input space. The theoretical sections discuss the design …

Radio frequency signal processing systems that use photorefractive crystals to provide key
functions are described. Some new experimental results obtained with a time-integrating …

A novelty filter detects what is new in a scene and may be likened to a temporal high-pass
filter. The current status of optical novelty filters and related devices, based upon four-wave …

We analyze the stability of two recently demonstrated photorefractive resonator circuits. The
analysis is based on single-mode models of the multimode circuits. The flip-flop, which …

TLT Kttartpcleiagmetn a Page 1 174 m Thursday, October 7, 1993 OSA Annual Meeting
Technical Digest arbitrart signals and caltculation of the auto- presentation, both theorx and …

Modules that perform photorefractive two-beam coupling operations have been built,
characterized, and tested. These portable modules, interconnected by fiber optics, dispense …

A new architecture for photorefractive adaptive filtering is introduced. This architecture is
based on the principle of time-integrating correlator with a photorefractive material as the …

In this article, we demonstrate the capability of a two-beam coupling photorefractive optical
novelty filter of detecting changes in the amplitude or phase of optical images. These …

Optical adaptive processors using photorefractive crystals as time integrating devices have
demonstrated greater than 40-dB cancellation of narrowband interference signals. However …

A photorefractive resonator containing an optical delay line is shown to learn temporal
information through a self-organization process. We present experiments in which a …