Reconfigurable optical add/drop multiplexer based on electro-optic effect in two directions

A novel rapidly tunable, low loss, low crosstalk, polarization-independent, four-port reconfigurable optical add/drop multiplexer (OADM) is designed in this article. Electrooptic effect is used in two directions on waveguides which are fabricated on a LiNbO3 substrate by Ti diffusion in order to convert the polarization between TE and TM mode at the download or upload wavelength. Particularly, voltages applied along propagation direction are separated and can be well programmed to suppress the sidelobe and drop multiple channels.