Polarization effect in parametric amplifiers is studied. Coupled equations are derived from the basic prop-agation equations and numerical solutions are given for both one-wavelength-pump and two-wavelength-pump systems. Several parametric amplifiers driven by pumps at one wavelength and two wavelengths areanalyzed and the polarization independent parametric amplifier is proposed. Polarization effect in parametric amplifiers is studied. Coupled equations are derived from the basic prop-agation equations and numerical solutions are given for both one-wavelength-pump and two-wavelength-pump systems. The figures areanalyzed and the polarization independent parametric amplifier is proposed.