Electro-optic channel waveguide modulator for multimode fibers

A multimode electro-optic modulator has been constructed and demonstrated using commercially available multimode fibers. Modulation occurs by the controlled channeling of light under metal electrodes. Significant modulation depth can be obtained for small applied voltages (50% with 14 Vrms) and the ultimate bandwidth is over 600 MHz. Since the device operates on the principle of total internal reflection, performance is independent of wavelength, and precise tolerances are not required for construction. As opposed to single-mode devices, high-efficiency fiber-to-film coupling is readily accomplished.