Some experiments of optical performance monitoring (OPM) with uniform or nonuniform
quasi-phase matching (QPM) gratings waveguides have already been demonstrated during the last few
years. Theoretical analyses based on coupled-wave equations are carried out for nonuniform QPM
gratings. The generation process of SHG in nonuniform QPM gratings is simulated and the outcome
comparison between uniform and nonuniform QPM gratings, which demonstrate that nonuniform QPM
gratings are more suitable for the OPM systems, is carried out in this paper. The value of grating chirp
coefficient of the chirped PPLN has influence on the efficiency and band width of the output pulse. The
relation between them is also discussed. These are new simulative attemptation to apply the
nonuniform quasi-phase matching gratings into optical performance monitoring system.
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