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Physics Letters A

Amplification of squeezed light and multiphoton processes

József Janszky, Yu. Ya. Yushin

Published Jun 1, 1989• 13 citations
Publisher
DOI
10.1016/0375-9601(89)90223-5

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In a previous paper it was found that the squeezed vacuum light is (2n−1)!!-fold more efficient in an n-photon process than coherent light of the same intensity. It is shown here that this is true not only for the squeezed vacuum but also for light with more complicated statistics if the variances of the quadratures used in describing squeezing are sufficiently different, even in the case when both variances are above the vacuum noise level. It is found that such light can be generated more easily than the squeezed light. It is also shown that, in contrast to squeezing, this high efficiency is not destroyed by a usual linear amplifier even during very strong amplification.
A model for the master equation of multiphoton processes with radiative damping of the atomic levels is proposed and a matrix method employed to solve exactly the rate equations for the matrix elements of the reduced density operator in the Fock representation. This model has been applied to the study of the low-noise properties of squeezed light in an all-optical transmission link formed from alternating sections of linear and nonlinear attenuating fibre and optical amplifiers. When the attenuators present radiative damping of the atomic levels (the lower atomic state is not the ground state) the signal-to-noise ratio is enhanced with respect to the case in which the lower atomic level is the ground state. The enhancement is improved when the input light is squeezed. The statistical properties of linear and two-photon amplification with an absorption process which exhibits radiative damping have also been analysed for coherent and squeezed inputs. The second-order fluctuations are reduced when radiative damping in the absorption process is considered except in the case of two-photon absorption for small values of the saturation parameter sa . When the value of this parameter is increased the behaviour of the fluctuations changes and the noise is reduced. These results could be of interest in all-optical transmission links and are improved when the input light is squeezed.