MULTIMODAL ANALYSIS METHOD FOR THE DESIGN OF PASSIVE TE TM CONVERTERSIN INTEGRATED WAVE-GUIDES/

One of the key devices in monolithically integrated coherent receivers for polarization diversity systems is the semiconductor waveguide TE/ TM mode converter. A multimodal analysis method of the conversion mech anisms in these devices is presented. This method can deal with asymme tric structures that are the actual case in fabricated devices. A two- dimensional vectorial finite element method is employed for the evalua tion of guided modes. The first design of a buried waveguide TE/TM con verter in InP/InGaAsP is proposed and simulated. The influence of the multimodal effects is discussed.