Characteristics of coplanar waveguides with metal coating on multilayer substrate: application to broadband LiNbO/sub 3/:Ti traveling wave light modulators/switch

摘要

A design is proposed for nonsymmetric electrodes for a broadband electrooptic modulator with low drive voltage. Traveling-wave electrodes, laterally shifted to reverse the direction of the applied electric field, are used to obtain constant phase variation. The finite-element method is used to compute the electrodes' characteristics taking into account both electrodes and buffers thickness. Numerical results are given for LiNbO/sub 3/:Ti substrate material at 1.52- mu m wavelength.