It is shown that the bandwidth of a traveling-wave electro-optical modulator can be greatly increased by matching of the group velocities of the optical and rf waves in the waveguides with cascaded Bragg gratings. A LiNbO><sub>3</sub> Mach–Zehnder modulator with 1-V half-wave voltage and a bandwidth in excess of 100 GHz is proposed and its performance evaluated.
© 2000 Optical Society of America
Jacob B. Khurgin, Jin U. Kang, and Yujie J. Ding, "Ultrabroad-bandwidth electro-optic modulator based on a cascaded Bragg grating," Opt. Lett. 25, 70-72 (2000)