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We enamine a conmadirectional asymmeuic nonlinear coupler composed of a linear waveguide and a nonlinear waveguide operating by second harmonic generation. For this we develop a new consistent approach to quantum contradirectional propagation. Using a short-length approximation or a strong^ stimulating field in the second harmonic mode, we can demonstrate an effective uansfer of non-classical properties of light from nonlinear to linear waveguides analysing quadrature and integrated intensily fluctuations, photon number distribution, reduced factorial moments and uncertainty product. Effects of non-classical behaviour of incident beams and of external noise we involved.

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