Investigation of high gain dual-pump phase sensitive amplifiers

In this paper, we investigated a high gain dual-pump degenerate phase sensitive amplifiers. We achieved a 22-dB signal gain with a nonlinear phase shift of 2 rad in the 3-nm pump-wavelength separation scheme. Here, we optimized the fiber dispersion to weaken the de-amplification effect of high-order sidebands based on a 27-wave numerical model. By using such a narrow-wavelength-separation dual-pump phase sensitive amplifier scheme, we achieved a 3.3-dB optical signal-noise-ratio improvement compared with that of erbium doped fiber amplifier with the same gain.