Fig. 1. Symmetrical 2×2 structure of multimode interference coupler optical switch

Fig. 2. Schematic diagram of multimode interference coupler of plane light waveguide light switch

Fig. 3. Optical field propagation after finite-difference time-domain optimization

Fig. 4. Distance between metal titanium and waveguide and transmission efficiency

Fig. 5. Picture of planar waveguide optical switch and electrode microscope

Fig. 6. Flow diagram of the performance characterization

Fig. 7. Transmission spectrum of cross and bar of planar waveguide optical switch

Fig. 8. Variation of phase modulated light intensity with voltage

Fig. 9. Schematic diagram of the phase modulation response time test circuit

Fig. 10. Response time of the optical switch