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A novel structure based on a side-coupled cavity for optical wavelength demultiplexing is proposed and demonstrated numerically by using the two-dimensional finite element method.It is found that the transmission wavelength of each channel can be tuned by adjusting the geometrical parameters of the structure and the material filling the side-coupled cavity.Moreover,by introducing a reflection nanocavity,the value of the transmitted-peak can be improved significantly.The results of theoretical analysis and simulation are well consistent with each other.