Investigation of the noise figure in degenerate dual-pump phase sensitive amplifier using a multi-wave model

TL;DR

This paper develops a semi-classical 7-wave model to analyze noise figures in degenerate dual-pump phase sensitive amplifiers, revealing how high-order wave interactions influence noise performance and how fiber dispersion can optimize gain without increasing noise.

Contribution

It introduces a comprehensive 7-wave model that accounts for high-order wave effects on noise figure in phase sensitive amplifiers, improving understanding beyond traditional 3-wave models.

Findings

High-order wave interactions degrade the noise figure compared to 3-wave predictions.

Proper fiber dispersion can enhance signal gain without significantly increasing noise figure.

The model shows potential for optimizing amplifier design to achieve low noise performance.

Abstract

A semi-classical 7-wave model is developed to investigate the noise performances of a degenerate dual-pump phase sensitive amplifier. This approach takes into account the transfer to the signal, through multiple four-wave mixing processes, of the vacuum fluctuations injected in the high-order waves. This effect leads to a degradation of the noise figure of the amplifier with respect to the 0 dB value predicted by the usual 3-wave model. However, it is proved that a careful choice of the fiber dispersion allows to use the high-order waves to enhance the signal gain without degrading the noise figure above 1 dB.