Patent ID: 9628179
Date: 2017-04-18
CPC Classifications: G01R,G02F,H04B

Claim:
1. A method for recovering a signal comprising the steps of: coupling a signal and incoherent background noise together to produce a mixed signal; amplifying the signal at the expense of the incoherent background noise to produce both a gain in the amplitude of the signal and a loss in the incoherent background noise by propagating the mixed signal over a distance in a nonlinear medium, wherein nonlinearity of said nonlinear medium is controllable and the loss in the incoherent background noise corresponds to the gain in the amplitude of the signal; and extracting said signal from said mixed signal by tuning a parameter of said signal, said noise, or said medium; wherein said step of propagating said mixed signal comprises propagating said mixed signal in a photorefractive crystal.