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Noise performance of a frequency nondegenerate phase-sensitive amplifier with unequalized inputs
Z Tong1, C Lundström, M Karlsson
1Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, Sweden. zhi.tong@chalmers.se
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 (0 dB NF) is obtained only when the input powers are equal. Experiments agree well with the theoretical predictions.
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