Signal output characteristics in a fiber optical parametric amplifier in high-gain-saturation region

This paper studies a fiber parametric amplifier in region of high gain saturation, and demonstrates, for the first time to the authors' knowledge, that optical power transfer from the signal and idler to the pump occurs at high signal input. Wavelength dependency is given special consideration, and it is shown that the signal gain saturates sooner on the farther wavelength sides of the gain peaks than on the closer sides with respect to the pump.