Frequency-agile rf notch filter that uses photorefractive two-beam coupling clickable element to
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We propose and demonstrate an optical system that performs adaptive notch filtering for RF
signals, where narrowband interference noise is rejected without knowing a priori its …

We present an optical signal-processing technique for additive noise reduction that uses the
noisy signal and a Gaussian reference beam to produce an adaptive Wiener filter. We …

We describe a real-time image-processing scheme that uses selective erasure of spatial
frequencies at the Fourier transform plane in an arrangement employing photorefractive two …

INFORMATION TO USERS Page 1 INFORMATION TO USERS This manuscript has been
reproduced from the microfilm master. UMI films the text directly from the original or copy …

Nonlinear optical thresholding in the Fourier plane produces optically adaptive noise-
cleaning masks that reduce additive signal-dependent noise, such as scalar multiplicative …

Computer simulations of photorefractive thresholding filters for the reduction of artifact or
dust noise demonstrate an increase in signal-to-noise ratio (SNR) of 70% to 95 …

We demonstrate a self-organizing photorefractive circuit that demultiplexes a beam that has
two signals imposed on separate optical carrier frequencies into two beams, each …

Theoretical and experimental study of a novelty filter is presented. We show that best
performances are obtained when the images are presented to the setup with a spatial light …

In this paper, we propose a novel high SNR tunable filter using a photorefractive single
crystal fiber with multiple holographic gratings. Since the single crystal fiber which is grown …