Phase properties of the asymmetric nonlinear coupler

摘要

We examine phase properties of a contradirectional nonlinear asymmetric coupler. We derive the phase distribution using the concept of phase space. An interesting behaviour of the linear mode, namely bifurcation of a distribution, phase shift, experienced during its propagation and phase switching are demonstrated. It is shown that light initially in the coherent state approximately maintains its phase properties during amplification although its Poissonian photon-number statistics are not conserved. Finally, thermal noise in the linear mode can be reduced and squeezing of the phase fluctuations under the level of those for the coherent state with appropriately chosen parameters of the process can be obtained. [References: 26]