A hybrid genetic algorithm is proposed to optimal design the wavelength converter which using segmented grating
structure and cascaded second-harmonic generation and difference-frequency generation process. Investigation of the
influences of the structure parameters on conversion bandwidth and conversion response are carried out. High conversion
efficiency, flat response and broad conversion bandwidth can be obtained simultaneously, by adding the segment number
of QPM grating and optimizing the poling period of each segment. The utilizing of the hybrid genetic algorithm can not
only make one obtain precise optimal results, but also shorten the simulation time significantly, so it is helpful to the
practical design of the wavelength converters.
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