Citation for the published paper: Malik, R. ; Kumpera, A. ;Olsson, S. (2014) "Optical signal to noise ratio improvement through unbalanced noise beating in phase-sensitive parametric amplifiers". Optics Express, vol. 22(9)
Abstract:We investigate the beating of signal and idler waves, which have imbalanced signal to noise ratios, in a phase-sensitive parametric amplifier. Imbalanced signal to noise ratios are achieved in two ways; first by imbalanced noise loading; second by varying idler to signal input power ratio. In the case of imbalanced noise loading the phase-sensitive amplifier improved the signal to noise ratio from 3 to 6 dB, and in the case of varying idler to signal input power ratio, the signal to noise ratio improved from 3 to in excess of 20 dB.