title: Optical signal to noise ratio improvement through unbalanced noise beating in phase-sensitive parametric amplifiers.
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.
authors.forename: R
authors.initials: R
authors.lastname: Malik
authors.forename: A
authors.initials: A
authors.lastname: Kumpera
authors.forename: S L I
authors.initials: SL
authors.lastname: Olsson
authors.forename: P A
authors.initials: PA
authors.lastname: Andrekson
authors.forename: M
authors.initials: M
authors.lastname: Karlsson