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Phase evolution of the direct detection noise figure of a nondegenerate fiber phase sensitive amplifier
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Phase evolution of the direct detection noise figure of a nondegenerate fiber phase sensitive amplifier
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We experimentally investigate the evolution of the direct detection noise figure of a non degenerate phase sensitive amplifier based on nonlinear fiber, as a function of the relative phase between the signal, idler, and pump, all other parameters remaining fixed. The use of a fiber with a high stimulated Brillouin scattering threshold permits to investigate the full range of phase sensitive gain and noise figure without pump dithering. Good agreement is found with theory, both for signal only and combined signal and idler direct detections.
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