Abstract :
This algorithm presented a simple analysis of traveling wave modulator (TWM) and active directional coupler, ADC, with coplanar electrodes. In this algorithm, the electrooptic material, EOM, is treated as anisotropic-homogenous material before and after the applied electric field by using the average values of the d.c electric field components, Exav and Eyav, instead of the varying components, Ex(x,y) and Ey(x,y). In this algorithm, for TWM, the mismatch velocity between microwave and optical waves has been improved by controlling the external drive voltage, to increase the optical effective refractive index, LiNbO3 is the best EOM. Also, for ADC, two waveguides propagation constants, coupling coefficient, C, and transferred power between ADC waveguides are controlled by an applied voltage C between two similar and dissimilar EOMs is evaluated. Two similar EOMs act as dissimilar materials with different orientation of crystallographic axes. Excellent pair of EOMs depend upon electrodes configurations. This algorithm permits finding the effect of all modulator and coupler parameters on the performance of them
Keywords :
electro-optical modulation; electrodes; optical directional couplers; refractive index; travelling wave tubes; voltage control; ADC; EOM; LiNbO3; TWM; active directional coupler; anisotropic-homogenous material; coplanar electrode; electrooptic material; refractive index; traveling wave modulator; voltage control; waveguide propagation constant; Algorithm design and analysis; Anisotropic magnetoresistance; Directional couplers; Electrodes; Optical control; Optical refraction; Optical variables control; Optical waveguides; Velocity control; Voltage control;
