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Soviet Journal of Quantum Electronics

Feasibility of increasing the maximum gain of an optical quantum amplifier

L. I. Zykov, S. B. Kormer, Stanislav M. Kulikov, Stanislav A. Sukharev, A. F. Shkapa

Published Oct 31, 1985• 0 citations
Publisher

Abstract

It is shown that the maximum gain of an optical quantum amplifier can be increased by a Doppler shift of the spectral emission line of the active substance.
DOI
10.1070/qe1985v015n10abeh007938

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In this paper we evaluate experimentally measured signal-to-noise ratio performance of different types of optical amplifiers [V. Josse, M. Sabuncu, N. Cerf, et al., Phys. Rev. Lett. 96 163602 (2006); Z.Y. Ou, S.F. Pereira and H.J. Kimble, Phys. Rev. Lett. 70 3239 (1993)]. We pay particular attention to the low gain regime where the quantum limit of the amplifier varies with gain. Independent of the amplifier type the noise performance is remarkably close to the quantum limit. Low gain optical amplifiers are of interest for quantum communication.
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