Experimental study of two-tone intermodulation products in a communications modulator

This article presents the experimental nonlinear characterization of a quadrature modulator following a two‐tone test approach. The observed intermodulation products show different slopes with respect to the desired carrier level that can be predicted by a simple model. Measurements for two‐tone tests versus carrier level and tone spacing are discussedCICYT TEC2008-06259/TECCICE P07-TIC-0264