Design and comparison of two kinds of silicon-on-insulator wavelength demultiplexers based on multimode interference

In this paper two kinds of wavelength demultiplexers with paired and beveled structures that work at 1.3µm /1. 55µm were presented. The various states of the wavelength demultiplexers were simulated and analyzed respectively using the finite difference beam propagation method (FD-BPM), the structure parameters of the wavelength demultiplexers were also designed and optimized. At last, the tolerance, excellence and disadvantage of the wavelength demultiplexers were analyzed and compared.