This document summarizes research on electro-optic tunable sparse gratings in lithium niobate waveguides for applications in dense wavelength division multiplexing (DWDM) communication systems. It describes the fabrication of titanium diffused lithium niobate waveguides with silicon dioxide strain gratings to achieve mode conversion between the transverse electric and transverse magnetic modes. Test results show over 96% polarization conversion efficiency across the C-band with a free spectral range of 9.131 GHz. The device operates by applying a voltage to integrated electrodes to tune the polarization response across a wide wavelength range.