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Noise performance of a frequency nondegenerate phase-sensitive amplifier with unequalized inputs

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Abstract

For the first time to our knowledge, the noise performance of a frequency nondegenerate phase-sensitive amplifier (PSA) with unequalized input powers has been experimentally characterized, based on a fiber-based parametric copier-PSA scheme. Two different noise–figure (NF) definitions—separate and combined NFs—are provided and compared. The results show that the separate NF of the weaker input wave is lower than that of the stronger wave due to the correlated-light nature. When considering the combined NF, the optimal noise performance (0dB NF) is obtained only when the input powers are equal. Experiments agree well with the theoretical predictions.

© 2011 Optical Society of America

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