Abstract: In this paper, a unidirectional electrooptic modulator based on an asymmetrical highly multi-mode wavedguide coupler is proposed. The energy distribution of all the guided modes within a highly multi-mode waveguide is studied and a new conclusion is obtained. Furthermore, the whole coupling process among all the guided modes between two nonidentical highly multi-mode waveguides is analyzed and the total coupling efficiency is calculated. To achieve high switching performance in a guided-wave coupler, a larger guide is made to have a dumping effect, which can be implemented by using an absorbing material or a grating. Based on the dumping effect, the dumping process is theoretically modeled and the dumping efficiency is simulated. Not only can a high dumping efficiency of 100 percent be achieved, but a high electrooptic modulation depth more than 90 percent can also be implemented. !15
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