Phase and amplitude characteristics of a phase-sensitive amplifier operating in gain saturation

Optics Express (Impact Factor: 3.49). 09/2011; 20(19):21400-21412. DOI: 10.1364/OE.20.021400


We investigate a non-degenerate phase-sensitive amplifier (PSA) operating in gain saturation experimentally and numerically using the three-wave model. The phase-dependent gain and phase-to-phase transfer functions are obtained for different levels of saturation with good agreement between experimental and numerical data when higher-order FWM is small. Moreover, we identify an operating point where the PSA is found to be able to significantly reduce both phase-and amplitude noise simultaneously.

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Available from: Bill Corcoran, Oct 06, 2015
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    • "Phase squeezing (σ PIA /σ PSA >1 for ϕ) of the noisy signal was observed for all the P signal /P pump1 ratios, but with worst performances for higher P signal /P pump1 ratios. This is believed to be caused by operation of the regenerator closer to the gain saturation regime where phase-to-phase transfer functions start to become less uniform as it was reported in [9] for a non-degenerate PSA. In this gain saturation regime, amplitude squeezing should also be expected but no clear evidence of this behavior was observed. "
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