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Abstract
In the present study, silicon nitride was used as the strip material of the strip-slot waveguide structure. Since silicon nitride exhibits low refractive index, a low effective refractive index strip was obtained. The dispersion compensation is 1554nm in wavelength. The high dispersion was achieved using a strong coupled effect between strip and slot waveguide modes at the resonant wavelength. The design was simulated using the finite difference time-domain (FDTD) method. The results here suggest a high normal dispersion of -1.5423×105ps/km-nm with a full width at half maximum((FWHM) of 18.6nm at 1554nm wavelength. The resonant wavelength can be changed around 1554nm by varying the strip thickness or slot thickness, and the magnitude and bandwidth of dispersion can be changed by tuning strip-slot separation.
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