DESIGN A 2x2 COMPACT MODE SWITCHING USING MULTIMODE INTERFERENCE BASED ON SILICON MATERIAL

Resumen

We propose a new design of a 2x2 optical chip for switching optical modes based on silicon material. Input lights at fundamental mode of transverse electric (TE) polarization can be selected at the output by appropriately controlling a 180-degree butterfly-shaped phase shifter. The proposed device consists of two multimode interference waveguides MMI and a phase shifter packed in a compact size of 4.2µm x 0.22µm x 110.4µm. We use 3D-BPM numerical simulation method to evaluate optical conversion efficiency of device. The result shows that insertion loss is always less than 1.5dB and crosstalk is always below -30dB in a wavelength range from 1.5  to 1.6 . Moreover, we continue to evaluate the proposed device on the system with signal?s bitrate of 35Gbps, the bit error rate is always less than 10-10 in the whole bandwidth of 100nm.