A theoretical model for description of the cSFG/DFG is developed in this paper. The factors influence the poled period of
PPLN is studied and the result shows that the poled period decreases while the temperature increases, and the poled
period also changes while we choose different signal wavelengths. In our simulation, a pulsed light is injected into a
PPLN waveguide as the signal, and then the performances of the wavelength conversion structures with two continuous
waves and two pulsed lights are compared in detail by numerical simulation. The output of these two situations are
educed while depletion, walk-off and nonlinear effect are all considered. The walk-off effects of output and conversion
efficiency are studied in both cases. The results demonstrate that there is an obvious walk-off between input signal and
output in the pulse pumped case, and in the CW case the converted wave width is boarder than that of input signal due to
pulse dispersion. Factors that influence the conversion efficiency are also analyzed including the power of the pump light,
the length of the PPLN waveguide and the experiment structure.
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