A series-resonant electrical-drive circuit has been used in conjunction with a fiber-coupled multimode electro-optic switch to achieve 2:1 optical time-division multiplexing from a 5-V sine-wave source at a 1.1-MHz rate. The LiTaO(3) mux-demux device is a unique fiber-optic switch that uses a curved prism electrode to deflect a trapped fiber-light cone while preserving the focusing obtained from an internal mirror.