Fig. 1. Schematics of structure and cross-section view of the coupler of thermo-optic mode switch. (a) Schematic of structure; (b) cross-section view of coupler

Fig. 2. [in Chinese]

Fig. 3. Optical mode transmission in the device when the LP₀₁ mode is launched into single mode waveguide. (a) When the heater is off; (b) when the heater is on

Fig. 4. Microscope images of cross-section of fabricated waveguide and electrode on the surface of the waveguide. (a) Cross-section of fabricated waveguide; (b) electrode

Fig. 5. Output near-field patterns of the device. (a) When the heater is off; (b) when the heater is on

Fig. 6. Variation of LP₀₁ mode output power with driving power

Fig. 7. Measured extinction ratio of device at different wavelengths

Fig. 8. Switching response of the TO mode switch