Noise reduction using adaptive spatial filtering in photorefractive two-beam coupling.
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 experimentally demonstrate an improvement from 1 to 8 in the signal-to-noise ratio by using nonlinear gain in two-beam coupling in barium titanate to transmit 50% of the signal and 6% of the noise.
J
J
Khoury
C L
CL
Woods
M
M
Cronin-Golomb