KERR NONLINEAR COUPLER WITH VARYING LINEAR COUPLING COEFFICIENT

We investigate a codirectional nonlinear coupler composed of two Kerr nonlinear waveguides. Unlike the conventional device, the linear coupl ing between the guides is supposed to be a variable function of the pr opagation distance. We calculate quantum statistical and dynamical pro perties of the Kerr nonlinear coupler with a coherent input and analys e the influence of coupling variation on oscillations in mean photon n umber. The possibility to control the switching characteristics and pr incipal squeezing effect by adjusting the form of coupling function is shown.