Fig. 1. Construction of elliptical MMI

Fig. 2. Simulation of traditional elliptical MMI crossing waveguide

Fig. 3. Crossing structure of new elliptical MMI based on SOI

Fig. 4. Simulated optical field distribution of new elliptical MMI crossing waveguide

Fig. 5. (a) First position of self-focusing of elliptical MMI; (b) first position of self-imaging of rectangle MMI; (c) sixth position of self-focusing of elliptical MMI

Fig. 6. Design of elliptical MMI crossing size. (a) W1=0.45 μm; (b) W1=0.5 μm

Fig. 7. Simulated optical field distribution of elliptical MMI crossing waveguide optimized. (a) W1=0.45 μm; (b) W1=0.5 μm

Fig. 8. Electric field model distribution for W1=0.45 μm. (a) Transverse; (b) longitudinal

Fig. 9. Electric field model distribution for W1=0.5 μm. (a) Transverse; (b) longitudinal

Fig. 10. Loss and crosstalk characteristics of elliptical MMI crossing waveguide for W1=0.45 μm. (a) Single loss; (b) single crosstalk

Fig. 11. Loss and crosstalk characteristics of elliptical MMI crossing waveguide for W1=0.5 μm. (a) Single loss; (b) single crosstalk