We demonstrate liquid-crystal-based integrated optical devices with $>140\mathrm{GHz}$ electrical tuning for potential applications in dynamic optical networks. Bragg wavelength tuning covering five $25\mathrm{GHz}$ wavelength-division multiplexing channel spacing has been achieved with $170\mathrm{V}$ (peak-to-peak) sinusoidal voltages applied across electropatterned indium tin oxide–covered glass electrodes placed $60\mu \mathrm{m}$ apart. This tunability range was limited only by the initial grating strength and supply voltage level. We also observed two distinct threshold behaviors that manifest during increase of supply voltage, resulting in a hysteresis in the tuning curve for both TE and TM input light.