Abstract

We have analyzed the Šolc filtering characteristics in a periodically poled $\mathrm{Ti}:{\mathrm{LiNbO}}_3$ (Ti:PPLN) multimode waveguide. The single- and dual-wavelength filtering were achieved under the optimized guiding condition for the ${\mathrm{TEM}}_{00}$-like mode and two mode (${\mathrm{TEM}}_{00}$- and ${\mathrm{TEM}}_{01}$-like mode), respectively. The full width at half-maximum of the filter was about $0.21\mathrm{nm}$ at both guiding conditions. We found that the origin of two peaks of the dual-wavelength Šolc filter in the two-mode guiding condition is the different effective refractive index between the ${\mathrm{TEM}}_{00}$- and ${\mathrm{TEM}}_{01}$-like modes. The wavelength difference of two peaks is about $0.8\mathrm{nm}$ at room temperature.

© 2007 Optical Society of America

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