Surface acoustic wave distribution and acoustooptic interactions in silica waveguide Bragg devices

Prediction of Nonlinear Distortion due to Acousto-Optic Interaction

“…T S =acoustic power density; M 2 =figure of merit of the material Fig. 1 shows a plot of eqn.1 from which it is obvious that it is a nonlinear equation and, therefore, can be used to predict the output nonlinear products resulting from a single-frequency sine-wave acoustic input.Moreover, it is well established in RF techniques that the single-carrier input/output characteristic of a nonlinear system can be used as a basis for characterising the system operation for arbitrary input signals [4,5] .This is applicable only for memoryless systems, i.e.system with input/output characteristics independent of the frequency. Therefore, on the assumption that the integrated optical spectrum-analyser characteristic is memoryless, eqn.1 can also be used for predicting its performance under a multisinusoidal acoustic input.…”