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Scattering Parameter Analysis of Light-Induced Periodic Microwave Structures

Based on the scattering parameter concept, an exact analysis of the reflection and transfer properties of light-induced waveguide gratings applied to microwave or millimetre wave frequencies, with special regard to internal return loss and multiple reflections, is reported. After a short presentation of the foundations of periodically photoexcited semiconductor waveguide structures, the S-parameters of a multi-stage optoelectronic grating configuration under optical CW-excitation are calculated. Moreover, the influence of an impedance mismatch between waveguide grating and measuring system is outlined quantitatively in the form of a modified scattering matrix.