Quadratic optical processor for reducing multiplicative noise an

Details Quadratic optical processor for reducing multiplicative noise an Quadratic optical processor for reducing multiplicative noise an

1992-07-29

1994-08-09

Look, Edward K.

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 29, 359300, 359306, 359561, G03H 102

Patent

active

053371704

ABSTRACT:
A degenerate four-wave mixing arrangement employs a photorefractive crystal as a real time holographic recording medium to record a hologram of the noisy optical signal. The signal passes through the crystal and is phase conjugated by a self pumped barium titanate phase conjugator, and the resulting phase conjugate beam reads out the hologram and multiplicative noise is substantially reduced in the optical output signal.

REFERENCES:
patent: 3717415 (1973-02-01), Woerdman
patent: 4145671 (1979-03-01), Hellwarth
patent: 4299489 (1981-11-01), Thery et al.
patent: 4566757 (1986-01-01), Fusek et al.
patent: 4726639 (1988-02-01), Brody

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