QUANTUM STATISTICS OF A NONLINEAR ASYMMETRIC COUPLER WITH STRONG PUMPING

We derive the quantum statistical properties of light beams involved i n an asymmetric nonlinear coupler composed of a linear waveguide and a nonlinear waveguide operating using second harmonic generation. Exami ning quadrature and integrated intensity fluctuations, photon number d istribution, reduced factorial moments and the uncertainty product, we demonstrate non-classical behaviour of single and compound modes. We show that squeezing of vacuum fluctuations, sub-Poissonian photon stat istics and oscillations in photon number distribution created by nonli near dynamics can be transferred to the linear signal mode. Also effec ts of non-classical incident beams and smoothing effects of external n oise are demonstrated.